Selecting Goodman Units for Reliable Mobile Home Climate Control

Selecting Goodman Units for Reliable Mobile Home Climate Control

Overview of HVAC needs specific to mobile homes

In today's rapidly changing climate, ensuring reliable climate control in mobile homes has become more crucial than ever. Technicians need specific training to work on HVAC systems in manufactured housing mobile home hvac units money. Mobile homes, often situated in varying environments and constructed with different materials compared to traditional houses, require a specific approach to heating and cooling. This is where selecting the right HVAC units becomes vital, and Goodman units stand out as an excellent choice for providing dependable comfort.


Mobile homes are unique living spaces that can present specific challenges when it comes to maintaining consistent indoor temperatures. Their lightweight construction makes them more susceptible to external temperature fluctuations, which can lead to discomfort during extreme weather conditions. Therefore, having a robust and reliable climate control system is essential not only for comfort but also for energy efficiency and cost savings.


Goodman HVAC units have earned a reputation for their reliability and efficiency, making them ideal for mobile home applications. One of the primary reasons Goodman units are preferred is their durability. Built with high-quality materials, these systems are designed to withstand the demands of diverse climates while delivering consistent performance year-round.


Another significant advantage of Goodman units is their energy efficiency. Mobile homeowners often face limited space and tighter budgets, so choosing an HVAC system that optimizes energy usage without sacrificing comfort is crucial. Goodman units feature advanced technology that helps reduce energy consumption while maintaining optimal indoor temperatures. This not only lowers utility bills but also contributes positively to environmental conservation efforts by minimizing carbon footprints.


The ease of installation and maintenance further enhances the appeal of Goodman units for mobile homes. Given the compact nature of these structures, finding systems that fit well within limited space constraints while providing easy access for maintenance is important. Goodman's design philosophy ensures that their HVAC systems are user-friendly and adaptable to various installation requirements typical of mobile homes.


Additionally, Goodman offers a wide range of products tailored to meet diverse needs and preferences, allowing homeowners to choose systems that match their specific requirements-whether it's a focus on cooling efficiency or enhanced heating capabilities during colder months.


In conclusion, as we navigate through increasingly unpredictable weather patterns brought on by climate change, the importance of reliable climate control in mobile homes cannot be overstated. Selecting appropriate HVAC systems like those offered by Goodman ensures not only comfort but also long-term sustainability through efficient energy use and reduced operational costs. For mobile homeowners seeking peace of mind and consistent indoor climates regardless of external conditions, investing in a reliable unit from a reputable brand such as Goodman is undoubtedly a wise decision.

When it comes to ensuring a comfortable living environment in a mobile home, selecting the appropriate HVAC system is of paramount importance. Goodman units have long been recognized for their reliability, efficiency, and performance, making them a favored choice for many homeowners. In this overview, we will delve into the key considerations when selecting Goodman units specifically tailored for mobile home climate control.


Mobile homes present unique challenges when it comes to heating and cooling. Their smaller size compared to traditional homes means that temperature regulation needs to be both efficient and effective. Moreover, mobile homes often have different insulation standards, which can affect how well they retain heat or cool air. This is where Goodman units shine with their versatile range of products designed to meet varying demands.


One of the primary advantages of Goodman units is their energy efficiency. The company's commitment to high SEER (Seasonal Energy Efficiency Ratio) ratings ensures that homeowners can enjoy optimal climate control without incurring exorbitant energy bills. For mobile homes, where space and resources may be limited, this efficiency becomes even more critical. By opting for a unit with a higher SEER rating, homeowners can reduce energy consumption while maintaining consistent indoor comfort levels.


Durability and ease of maintenance are other compelling reasons to consider Goodman units for mobile homes. These systems are designed with robust materials and engineering excellence that withstand diverse weather conditions-an essential feature considering that mobile homes may be located in areas prone to extreme temperatures or severe weather events. Additionally, Goodman units are known for straightforward maintenance processes which help extend the lifespan of the unit and ensure dependable operation over time.


When selecting an HVAC system for a mobile home, sizing is also crucial. A system that's too large or too small can lead to inefficiencies such as uneven temperature distribution or unnecessary energy use. Fortunately, Goodman offers a variety of sizes and configurations allowing homeowners to select a unit that perfectly matches their specific needs.


Lastly, affordability remains one of Goodman's standout features without compromising quality or performance-a crucial factor for many families looking at cost-effective solutions during these challenging economic times.


In summary, choosing the right HVAC system is vital in maintaining comfort within a mobile home setting; thus making Goodman units an excellent option due mainly because they combine efficiency with durability while offering various models suited explicitly towards compact living spaces like those found in typical manufactured housing environments-all at competitive prices! Whether it's battling summer heatwaves or keeping warm during chilly winter nights-Goodman has suitable options ensuring families remain comfortable year-round regardless what Mother Nature throws their way!

The Role of Equipment Compatibility in Mobile Home HVAC Financing Options

The Role of Equipment Compatibility in Mobile Home HVAC Financing Options

In the realm of mobile home living, efficient heating, ventilation, and air conditioning (HVAC) systems are not just a luxury but a necessity.. The unique structure and design of mobile homes require specialized HVAC solutions that ensure comfort without compromising on energy efficiency.

Posted by on 2024-12-30

Top HVAC Brands Offering Exclusive Payment Plans for Mobile Homes

Top HVAC Brands Offering Exclusive Payment Plans for Mobile Homes

In today's fast-paced world, homeowners are consistently seeking solutions that blend quality and affordability, especially when it comes to vital home systems like heating, ventilation, and air conditioning (HVAC).. For owners of mobile homes, finding the right HVAC system can be a particular challenge due to unique space constraints and mobility considerations.

Posted by on 2024-12-30

Understanding Brand-Specific Compatibility for Mobile Home HVAC Installations

Understanding Brand-Specific Compatibility for Mobile Home HVAC Installations

When it comes to mobile home HVAC installations, understanding brand-specific compatibility is crucial for ensuring both proper installation and long-term maintenance.. Mobile homes have unique architectural and structural characteristics that require tailored heating and cooling solutions.

Posted by on 2024-12-30

Understanding Financing Options for Mobile Home HVAC

When selecting a climate control system for your mobile home, reliability and efficiency are paramount. Goodman units stand out as an exemplary choice, offering a blend of key features and benefits that make them ideal for this unique living space.


First and foremost, Goodman units are renowned for their robust durability. Built with high-quality materials and advanced engineering, these systems are designed to withstand the test of time, providing consistent performance even in challenging conditions. This reliability is crucial for mobile homes, which may face varying weather patterns as they travel or settle in different regions.


Energy efficiency is another standout feature of Goodman units. With increasing energy costs and growing environmental concerns, having an HVAC system that minimizes energy consumption is essential. Goodman units are equipped with high SEER (Seasonal Energy Efficiency Ratio) ratings, ensuring that they operate efficiently while keeping utility bills in check. This makes them not only a cost-effective choice but also an environmentally responsible one.


Moreover, Goodman units offer superior comfort through precise climate control capabilities. They are designed to maintain steady indoor temperatures by efficiently regulating airflow and humidity levels. For mobile home residents who often experience space constraints, the compact yet powerful design of Goodman systems ensures optimal comfort without occupying excessive room or detracting from the home's aesthetics.


Ease of installation and maintenance further enhances the appeal of Goodman units. Their straightforward design allows for quicker installations with fewer complications-an important consideration when working within the limited spaces typical of mobile homes. Additionally, their user-friendly interfaces and accessible components simplify routine maintenance tasks, reducing downtime and extending the life span of the unit.


In terms of customer support and warranty offerings, Goodman excels by providing comprehensive service packages that offer peace of mind to homeowners. Their extensive network of service professionals ensures prompt assistance whenever needed, further solidifying their reputation as a reliable choice for mobile home climate control.


In conclusion, selecting a Goodman unit for your mobile home is an investment in quality and reliability. With features emphasizing durability, energy efficiency, comfort optimization, ease of maintenance, and strong customer support structures in place-Goodman units prove themselves as a top contender in ensuring effective climate control tailored to meet the needs of mobile homeowners everywhere.

Understanding Financing Options for Mobile Home HVAC

Explanation of common financing packages available

When considering the selection of Goodman units for mobile homes, several key factors come into play to ensure that these homes are provided with reliable climate control. Mobile homes, given their unique structural and environmental characteristics, require specialized attention when it comes to heating and cooling solutions. Goodman, a reputable name in the HVAC industry, offers a range of units specifically designed to meet these needs effectively.


First and foremost, it's crucial to assess the size and layout of your mobile home. Mobile homes typically have different spatial configurations compared to traditional houses, often being narrower and more compact. Therefore, selecting an appropriately sized Goodman unit is essential for efficient climate control. An undersized unit may struggle to maintain desired temperatures during extreme weather conditions, while an oversized unit might cycle on and off too frequently, leading to increased wear and tear.


Energy efficiency is another critical factor to consider. Mobile homes often have limited insulation compared to conventional homes, which can result in higher energy consumption if not properly managed. Goodman units are known for their energy-efficient models that comply with current regulations aimed at reducing energy usage while maintaining optimal performance. Choosing a unit with a high Seasonal Energy Efficiency Ratio (SEER) rating can lead to significant savings on utility bills over time.


The installation process is also an important consideration. Mobile homes may present challenges due to their construction materials and limited space for ductwork or external components like condensers. It's advisable to consult with HVAC professionals who have experience working with mobile homes to ensure proper installation of the Goodman unit. This not only guarantees efficient operation but also prolongs the lifespan of the system by preventing potential issues arising from improper setup.


Additionally, consider the specific climate conditions where your mobile home is located. Different geographic locations will have varying temperature ranges and humidity levels throughout the year. Selecting a Goodman unit that can handle these specific demands ensures consistent indoor comfort regardless of external weather conditions.


Maintenance and serviceability should also be factored into your decision-making process. Regular maintenance is vital for any HVAC system's longevity and efficiency, particularly in mobile homes where space constraints can make servicing more challenging. Goodman units are designed for ease of maintenance with accessible components that simplify routine checks and repairs.


In conclusion, selecting the right Goodman unit for your mobile home involves careful consideration of various factors including size compatibility, energy efficiency ratings, installation requirements, climatic conditions specific to your location, and ease of maintenance. By taking these elements into account, you can ensure that your mobile home remains comfortable year-round while optimizing energy use and extending the life of your HVAC system. Investing time in making an informed choice will pay dividends in terms of both comfort levels within your home and cost savings on utilities over time.

Key factors to consider when choosing a financing option

When it comes to ensuring reliable climate control in mobile homes, selecting the right HVAC units is crucial. Goodman units have consistently proven to be a dependable choice for this purpose, known for their efficiency and durability. However, achieving optimal performance from these units requires careful attention during installation and diligent maintenance afterward.


The first step towards reliable climate control begins with proper installation. Ensuring that the unit is correctly sized for your mobile home is paramount. An undersized unit will struggle to maintain the desired temperature, leading to increased energy consumption and wear over time. Conversely, an oversized unit may cycle on and off too frequently, reducing its efficiency and lifespan. Consulting with a professional HVAC technician who can assess your home's specific heating and cooling needs is essential.


Once the right size is determined, the installation process must focus on strategic placement. Goodman units need adequate clearance around them for proper airflow; blocking this space can hinder performance and lead to overheating or mechanical failure. Additionally, ensuring that ductwork is properly sealed can prevent air leaks which compromise the system's efficiency.


After successful installation, regular maintenance becomes key in sustaining optimal performance of Goodman units. One of the simplest yet most effective tips is routinely replacing air filters. Clogged filters restrict airflow, forcing the system to work harder than necessary and potentially leading to costly repairs down the line.


Furthermore, scheduling annual inspections with an HVAC professional can help identify potential issues before they become major problems. Technicians can check refrigerant levels, clean coils, inspect electrical connections, and ensure that all components function as intended.


Homeowners should also pay attention to any unusual noises or changes in system performance such as irregular cycling or uneven heating/cooling within different areas of the home. These could be early indicators of underlying issues needing prompt attention.


In summary, while selecting a Goodman unit sets a strong foundation for reliable climate control in mobile homes, maximizing its performance hinges on meticulous installation and proactive maintenance practices. By following these guidelines-choosing the right size unit, ensuring proper placement during installation, routinely replacing filters, conducting regular professional inspections-the longevity and efficiency of Goodman systems can be greatly enhanced, providing comfort year-round without unexpected disruptions or expenses.

Personal Loans for HVAC Systems

When it comes to selecting climate control systems for mobile homes, Goodman units frequently emerge as a popular choice. This preference is not without reason; Goodman units are renowned for their energy efficiency and cost-effectiveness. These two factors are crucial when considering the unique needs of mobile homes, which often require a delicate balance between performance and affordability.


Energy efficiency is paramount in any heating or cooling system, but it holds particular significance in mobile homes. Mobile homes typically have less insulation compared to traditional houses, making them more susceptible to external temperature changes. Goodman units address this challenge by employing advanced technology that optimizes energy use while maintaining a comfortable indoor environment. They feature high Seasonal Energy Efficiency Ratios (SEER) for air conditioners and Heat Seasonal Performance Factors (HSPF) for heat pumps, ensuring that homeowners receive maximum climate control with minimal energy consumption.


The cost-effectiveness of Goodman units further enhances their appeal for mobile home owners. Purchasing and installing HVAC systems can represent a significant investment, particularly when budgets are tight. Goodman units stand out due to their competitive pricing and reliable performance over time. Their durability ensures that maintenance costs remain low, while the initial purchase price is often more affordable than comparable brands without sacrificing quality.


Moreover, many Goodman models come with comprehensive warranties that provide additional peace of mind for homeowners worried about potential repair costs down the line. This financial security allows mobile home residents to enjoy consistent climate control without fear of unexpected expenses disrupting their monthly budget.


In summation, the decision to select a Goodman unit for climate control in a mobile home setting is often driven by its superior energy efficiency and remarkable cost-effectiveness. By reducing energy consumption and minimizing long-term expenses, these units offer an ideal solution for achieving reliable comfort without breaking the bank. As such, they continue to be an intelligent choice for those seeking dependable HVAC solutions tailored to the distinct needs of mobile home living.

A DuPont R-134a refrigerant

A refrigerant is a working fluid used in cooling, heating or reverse cooling and heating of air conditioning systems and heat pumps where they undergo a repeated phase transition from a liquid to a gas and back again. Refrigerants are heavily regulated because of their toxicity and flammability[1] and the contribution of CFC and HCFC refrigerants to ozone depletion[2] and that of HFC refrigerants to climate change.[3]

Refrigerants are used in a direct expansion (DX- Direct Expansion) system (circulating system)to transfer energy from one environment to another, typically from inside a building to outside (or vice versa) commonly known as an air conditioner cooling only or cooling & heating reverse DX system or heat pump a heating only DX cycle. Refrigerants can carry 10 times more energy per kg than water, and 50 times more than air.

Refrigerants are controlled substances and classified by International safety regulations ISO 817/5149, AHRAE 34/15 & BS EN 378 due to high pressures (700–1,000 kPa (100–150 psi)), extreme temperatures (−50 °C [−58 °F] to over 100 °C [212 °F]), flammability (A1 class non-flammable, A2/A2L class flammable and A3 class extremely flammable/explosive) and toxicity (B1-low, B2-medium & B3-high). The regulations relate to situations when these refrigerants are released into the atmosphere in the event of an accidental leak not while circulated.

Refrigerants (controlled substances) must only be handled by qualified/certified engineers for the relevant classes (in the UK, C&G 2079 for A1-class and C&G 6187-2 for A2/A2L & A3-class refrigerants).

Refrigerants (A1 class only) Due to their non-flammability, A1 class non-flammability, non-explosivity, and non-toxicity, non-explosivity they have been used in open systems (consumed when used) like fire extinguishers, inhalers, computer rooms fire extinguishing and insulation, etc.) since 1928.

History

[edit]
The observed stabilization of HCFC concentrations (left graphs) and the growth of HFCs (right graphs) in earth's atmosphere.

The first air conditioners and refrigerators employed toxic or flammable gases, such as ammonia, sulfur dioxide, methyl chloride, or propane, that could result in fatal accidents when they leaked.[4]

In 1928 Thomas Midgley Jr. created the first non-flammable, non-toxic chlorofluorocarbon gas, Freon (R-12). The name is a trademark name owned by DuPont (now Chemours) for any chlorofluorocarbon (CFC), hydrochlorofluorocarbon (HCFC), or hydrofluorocarbon (HFC) refrigerant. Following the discovery of better synthesis methods, CFCs such as R-11,[5] R-12,[6] R-123[5] and R-502[7] dominated the market.

Phasing out of CFCs

[edit]

In the mid-1970s, scientists discovered that CFCs were causing major damage to the ozone layer that protects the earth from ultraviolet radiation, and to the ozone holes over polar regions.[8][9] This led to the signing of the Montreal Protocol in 1987 which aimed to phase out CFCs and HCFC[10] but did not address the contributions that HFCs made to climate change. The adoption of HCFCs such as R-22,[11][12][13] and R-123[5] was accelerated and so were used in most U.S. homes in air conditioners and in chillers[14] from the 1980s as they have a dramatically lower Ozone Depletion Potential (ODP) than CFCs, but their ODP was still not zero which led to their eventual phase-out.

Hydrofluorocarbons (HFCs) such as R-134a,[15][16] R-407A,[17] R-407C,[18] R-404A,[7] R-410A[19] (a 50/50 blend of R-125/R-32) and R-507[20][21] were promoted as replacements for CFCs and HCFCs in the 1990s and 2000s. HFCs were not ozone-depleting but did have global warming potentials (GWPs) thousands of times greater than CO2 with atmospheric lifetimes that can extend for decades. This in turn, starting from the 2010s, led to the adoption in new equipment of Hydrocarbon and HFO (hydrofluoroolefin) refrigerants R-32,[22] R-290,[23] R-600a,[23] R-454B,[24] R-1234yf,[25][26] R-514A,[27] R-744 (CO2),[28] R-1234ze(E)[29] and R-1233zd(E),[30] which have both an ODP of zero and a lower GWP. Hydrocarbons and CO2 are sometimes called natural refrigerants because they can be found in nature.

The environmental organization Greenpeace provided funding to a former East German refrigerator company to research alternative ozone- and climate-safe refrigerants in 1992. The company developed a hydrocarbon mixture of propane and isobutane, or pure isobutane,[31] called "Greenfreeze", but as a condition of the contract with Greenpeace could not patent the technology, which led to widespread adoption by other firms.[32][33][34] Policy and political influence by corporate executives resisted change however,[35][36] citing the flammability and explosive properties of the refrigerants,[37] and DuPont together with other companies blocked them in the U.S. with the U.S. EPA.[38][39]

Beginning on 14 November 1994, the U.S. Environmental Protection Agency restricted the sale, possession and use of refrigerants to only licensed technicians, per rules under sections 608 and 609 of the Clean Air Act.[40] In 1995, Germany made CFC refrigerators illegal.[41]

In 1996 Eurammon, a European non-profit initiative for natural refrigerants, was established and comprises European companies, institutions, and industry experts.[42][43][44]

In 1997, FCs and HFCs were included in the Kyoto Protocol to the Framework Convention on Climate Change.

In 2000 in the UK, the Ozone Regulations[45] came into force which banned the use of ozone-depleting HCFC refrigerants such as R22 in new systems. The Regulation banned the use of R22 as a "top-up" fluid for maintenance from 2010 for virgin fluid and from 2015 for recycled fluid.[citation needed]

Addressing greenhouse gases

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With growing interest in natural refrigerants as alternatives to synthetic refrigerants such as CFCs, HCFCs and HFCs, in 2004, Greenpeace worked with multinational corporations like Coca-Cola and Unilever, and later Pepsico and others, to create a corporate coalition called Refrigerants Naturally!.[41][46] Four years later, Ben & Jerry's of Unilever and General Electric began to take steps to support production and use in the U.S.[47] It is estimated that almost 75 percent of the refrigeration and air conditioning sector has the potential to be converted to natural refrigerants.[48]

In 2006, the EU adopted a Regulation on fluorinated greenhouse gases (FCs and HFCs) to encourage to transition to natural refrigerants (such as hydrocarbons). It was reported in 2010 that some refrigerants are being used as recreational drugs, leading to an extremely dangerous phenomenon known as inhalant abuse.[49]

From 2011 the European Union started to phase out refrigerants with a global warming potential (GWP) of more than 150 in automotive air conditioning (GWP = 100-year warming potential of one kilogram of a gas relative to one kilogram of CO2) such as the refrigerant HFC-134a (known as R-134a in North America) which has a GWP of 1526.[50] In the same year the EPA decided in favour of the ozone- and climate-safe refrigerant for U.S. manufacture.[32][51][52]

A 2018 study by the nonprofit organization "Drawdown" put proper refrigerant management and disposal at the very top of the list of climate impact solutions, with an impact equivalent to eliminating over 17 years of US carbon dioxide emissions.[53]

In 2019 it was estimated that CFCs, HCFCs, and HFCs were responsible for about 10% of direct radiative forcing from all long-lived anthropogenic greenhouse gases.[54] and in the same year the UNEP published new voluntary guidelines,[55] however many countries have not yet ratified the Kigali Amendment.

From early 2020 HFCs (including R-404A, R-134a and R-410A) are being superseded: Residential air-conditioning systems and heat pumps are increasingly using R-32. This still has a GWP of more than 600. Progressive devices use refrigerants with almost no climate impact, namely R-290 (propane), R-600a (isobutane) or R-1234yf (less flammable, in cars). In commercial refrigeration also CO2 (R-744) can be used.

Requirements and desirable properties

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A refrigerant needs to have: a boiling point that is somewhat below the target temperature (although boiling point can be adjusted by adjusting the pressure appropriately), a high heat of vaporization, a moderate density in liquid form, a relatively high density in gaseous form (which can also be adjusted by setting pressure appropriately), and a high critical temperature. Working pressures should ideally be containable by copper tubing, a commonly available material. Extremely high pressures should be avoided.[citation needed]

The ideal refrigerant would be: non-corrosive, non-toxic, non-flammable, with no ozone depletion and global warming potential. It should preferably be natural with well-studied and low environmental impact. Newer refrigerants address the issue of the damage that CFCs caused to the ozone layer and the contribution that HCFCs make to climate change, but some do raise issues relating to toxicity and/or flammability.[56]

Common refrigerants

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Refrigerants with very low climate impact

[edit]

With increasing regulations, refrigerants with a very low global warming potential are expected to play a dominant role in the 21st century,[57] in particular, R-290 and R-1234yf. Starting from almost no market share in 2018,[58] low GWPO devices are gaining market share in 2022.

Code Chemical Name GWP 20yr[59] GWP 100yr[59] Status Commentary
R-290 C3H8 Propane   3.3[60] Increasing use Low cost, widely available and efficient. They also have zero ozone depletion potential. Despite their flammability, they are increasingly used in domestic refrigerators and heat pumps. In 2010, about one-third of all household refrigerators and freezers manufactured globally used isobutane or an isobutane/propane blend, and this was expected to increase to 75% by 2020.[61]
R-600a HC(CH3)3 Isobutane   3.3 Widely used See R-290.
R-717 NH3 Ammonia 0 0[62] Widely used Commonly used before the popularisation of CFCs, it is again being considered but does suffer from the disadvantage of toxicity, and it requires corrosion-resistant components, which restricts its domestic and small-scale use. Anhydrous ammonia is widely used in industrial refrigeration applications and hockey rinks because of its high energy efficiency and low cost.
R-1234yf HFO-1234yf C3H2F4 2,3,3,3-Tetrafluoropropene   <1   Less performance but also less flammable than R-290.[57] GM announced that it would start using "hydro-fluoro olefin", HFO-1234yf, in all of its brands by 2013.[63]
R-744 CO2 Carbon dioxide 1 1 In use Was used as a refrigerant prior to the discovery of CFCs (this was also the case for propane)[4] and now having a renaissance due to it being non-ozone depleting, non-toxic and non-flammable. It may become the working fluid of choice to replace current HFCs in cars, supermarkets, and heat pumps. Coca-Cola has fielded CO2-based beverage coolers and the U.S. Army is considering CO2 refrigeration.[64][65] Due to the need to operate at pressures of up to 130 bars (1,900 psi; 13,000 kPa), CO2 systems require highly resistant components, however these have already been developed for mass production in many sectors.

Most used

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Code Chemical Name Global warming potential 20yr[59] GWP 100yr[59] Status Commentary
R-32 HFC-32 CH2F2 Difluoromethane 2430 677 Widely used Promoted as climate-friendly substitute for R-134a and R-410A, but still with high climate impact. Has excellent heat transfer and pressure drop performance, both in condensation and vaporisation.[66] It has an atmospheric lifetime of nearly 5 years.[67] Currently used in residential and commercial air-conditioners and heat pumps.
R-134a HFC-134a CH2FCF3 1,1,1,2-Tetrafluoroethane 3790 1550 Widely used Most used in 2020 for hydronic heat pumps in Europe and the United States in spite of high GWP.[58] Commonly used in automotive air conditioners prior to phase out which began in 2012.
R-410A   50% R-32 / 50% R-125 (pentafluoroethane) Between 2430 (R-32) and 6350 (R-125) > 677 Widely Used Most used in split heat pumps / AC by 2018. Almost 100% share in the USA.[58] Being phased out in the US starting in 2022.[68][69]

Banned / Phased out

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Code Chemical Name Global warming potential 20yr[59] GWP 100yr[59] Status Commentary
R-11 CFC-11 CCl3F Trichlorofluoromethane 6900 4660 Banned Production was banned in developed countries by Montreal Protocol in 1996
R-12 CFC-12 CCl2F2 Dichlorodifluoromethane 10800 10200 Banned Also known as Freon, a widely used chlorofluorocarbon halomethane (CFC). Production was banned in developed countries by Montreal Protocol in 1996, and in developing countries (article 5 countries) in 2010.[70]
R-22 HCFC-22 CHClF2 Chlorodifluoromethane 5280 1760 Being phased out A widely used hydrochlorofluorocarbon (HCFC) and powerful greenhouse gas with a GWP equal to 1810. Worldwide production of R-22 in 2008 was about 800 Gg per year, up from about 450 Gg per year in 1998. R-438A (MO-99) is a R-22 replacement.[71]
R-123 HCFC-123 CHCl2CF3 2,2-Dichloro-1,1,1-trifluoroethane 292 79 US phase-out Used in large tonnage centrifugal chiller applications. All U.S. production and import of virgin HCFCs will be phased out by 2030, with limited exceptions.[72] R-123 refrigerant was used to retrofit some chiller that used R-11 refrigerant Trichlorofluoromethane. The production of R-11 was banned in developed countries by Montreal Protocol in 1996.[73]

Other

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Code Chemical Name Global warming potential 20yr[59] GWP 100yr[59] Commentary
R-152a HFC-152a CH3CHF2 1,1-Difluoroethane 506 138 As a compressed air duster
R-407C   Mixture of difluoromethane and pentafluoroethane and 1,1,1,2-tetrafluoroethane     A mixture of R-32, R-125, and R-134a
R-454B   Difluoromethane and 2,3,3,3-Tetrafluoropropene     HFOs blend of refrigerants Difluoromethane (R-32) and 2,3,3,3-Tetrafluoropropene (R-1234yf).[74][75][76][77]
R-513A   An HFO/HFC blend (56% R-1234yf/44%R-134a)     May replace R-134a as an interim alternative[78]
R-514A   HFO-1336mzz-Z/trans-1,2- dichloroethylene (t-DCE)     An hydrofluoroolefin (HFO)-based refrigerant to replace R-123 in low pressure centrifugal chillers for commercial and industrial applications.[79][80]

Refrigerant reclamation and disposal

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Coolant and refrigerants are found throughout the industrialized world, in homes, offices, and factories, in devices such as refrigerators, air conditioners, central air conditioning systems (HVAC), freezers, and dehumidifiers. When these units are serviced, there is a risk that refrigerant gas will be vented into the atmosphere either accidentally or intentionally, hence the creation of technician training and certification programs in order to ensure that the material is conserved and managed safely. Mistreatment of these gases has been shown to deplete the ozone layer and is suspected to contribute to global warming.[81]

With the exception of isobutane and propane (R600a, R441A and R290), ammonia and CO2 under Section 608 of the United States' Clean Air Act it is illegal to knowingly release any refrigerants into the atmosphere.[82][83]

Refrigerant reclamation is the act of processing used refrigerant gas which has previously been used in some type of refrigeration loop such that it meets specifications for new refrigerant gas. In the United States, the Clean Air Act of 1990 requires that used refrigerant be processed by a certified reclaimer, which must be licensed by the United States Environmental Protection Agency (EPA), and the material must be recovered and delivered to the reclaimer by EPA-certified technicians.[84]

Classification of refrigerants

[edit]
R407C pressure-enthalpy diagram, isotherms between the two saturation lines

Refrigerants may be divided into three classes according to their manner of absorption or extraction of heat from the substances to be refrigerated:[citation needed]

  • Class 1: This class includes refrigerants that cool by phase change (typically boiling), using the refrigerant's latent heat.
  • Class 2: These refrigerants cool by temperature change or 'sensible heat', the quantity of heat being the specific heat capacity x the temperature change. They are air, calcium chloride brine, sodium chloride brine, alcohol, and similar nonfreezing solutions. The purpose of Class 2 refrigerants is to receive a reduction of temperature from Class 1 refrigerants and convey this lower temperature to the area to be cooled.
  • Class 3: This group consists of solutions that contain absorbed vapors of liquefiable agents or refrigerating media. These solutions function by nature of their ability to carry liquefiable vapors, which produce a cooling effect by the absorption of their heat of solution. They can also be classified into many categories.

R numbering system

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The R- numbering system was developed by DuPont (which owned the Freon trademark), and systematically identifies the molecular structure of refrigerants made with a single halogenated hydrocarbon. ASHRAE has since set guidelines for the numbering system as follows:[85]

R-X1X2X3X4

  • X1 = Number of unsaturated carbon-carbon bonds (omit if zero)
  • X2 = Number of carbon atoms minus 1 (omit if zero)
  • X3 = Number of hydrogen atoms plus 1
  • X4 = Number of fluorine atoms

Series

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  • R-xx Methane Series
  • R-1xx Ethane Series
  • R-2xx Propane Series
  • R-4xx Zeotropic blend
  • R-5xx Azeotropic blend
  • R-6xx Saturated hydrocarbons (except for propane which is R-290)
  • R-7xx Inorganic Compounds with a molar mass < 100
  • R-7xxx Inorganic Compounds with a molar mass ≥ 100

Ethane Derived Chains

[edit]
  • Number Only Most symmetrical isomer
  • Lower Case Suffix (a, b, c, etc.) indicates increasingly unsymmetrical isomers

Propane Derived Chains

[edit]
  • Number Only If only one isomer exists; otherwise:
  • First lower case suffix (a-f):
    • a Suffix Cl2 central carbon substitution
    • b Suffix Cl, F central carbon substitution
    • c Suffix F2 central carbon substitution
    • d Suffix Cl, H central carbon substitution
    • e Suffix F, H central carbon substitution
    • f Suffix H2 central carbon substitution
  • 2nd Lower Case Suffix (a, b, c, etc.) Indicates increasingly unsymmetrical isomers

Propene derivatives

[edit]
  • First lower case suffix (x, y, z):
    • x Suffix Cl substitution on central atom
    • y Suffix F substitution on central atom
    • z Suffix H substitution on central atom
  • Second lower case suffix (a-f):
    • a Suffix =CCl2 methylene substitution
    • b Suffix =CClF methylene substitution
    • c Suffix =CF2 methylene substitution
    • d Suffix =CHCl methylene substitution
    • e Suffix =CHF methylene substitution
    • f Suffix =CH2 methylene substitution

Blends

[edit]
  • Upper Case Suffix (A, B, C, etc.) Same blend with different compositions of refrigerants

Miscellaneous

[edit]
  • R-Cxxx Cyclic compound
  • R-Exxx Ether group is present
  • R-CExxx Cyclic compound with an ether group
  • R-4xx/5xx + Upper Case Suffix (A, B, C, etc.) Same blend with different composition of refrigerants
  • R-6xx + Lower Case Letter Indicates increasingly unsymmetrical isomers
  • 7xx/7xxx + Upper Case Letter Same molar mass, different compound
  • R-xxxxB# Bromine is present with the number after B indicating how many bromine atoms
  • R-xxxxI# Iodine is present with the number after I indicating how many iodine atoms
  • R-xxx(E) Trans Molecule
  • R-xxx(Z) Cis Molecule

For example, R-134a has 2 carbon atoms, 2 hydrogen atoms, and 4 fluorine atoms, an empirical formula of tetrafluoroethane. The "a" suffix indicates that the isomer is unbalanced by one atom, giving 1,1,1,2-Tetrafluoroethane. R-134 (without the "a" suffix) would have a molecular structure of 1,1,2,2-Tetrafluoroethane.

The same numbers are used with an R- prefix for generic refrigerants, with a "Propellant" prefix (e.g., "Propellant 12") for the same chemical used as a propellant for an aerosol spray, and with trade names for the compounds, such as "Freon 12". Recently, a practice of using abbreviations HFC- for hydrofluorocarbons, CFC- for chlorofluorocarbons, and HCFC- for hydrochlorofluorocarbons has arisen, because of the regulatory differences among these groups.[citation needed]

Refrigerant safety

[edit]

ASHRAE Standard 34, Designation and Safety Classification of Refrigerants, assigns safety classifications to refrigerants based upon toxicity and flammability.

Using safety information provided by producers, ASHRAE assigns a capital letter to indicate toxicity and a number to indicate flammability. The letter "A" is the least toxic and the number 1 is the least flammable.[86]

See also

[edit]
  • Brine (Refrigerant)
  • Section 608
  • List of Refrigerants

References

[edit]
  1. ^ United Nations Environment Programme (UNEP). "Update on New Refrigerants Designations and Safety Classifications" (PDF). ASHRAE. Retrieved 6 October 2024.
  2. ^ "Phaseout of Class II Ozone-Depleting Substances". US Environmental Protection Agency. 22 July 2015. Retrieved October 6, 2024.
  3. ^ "Protecting Our Climate by Reducing Use of HFCs". United States Environmental Protection Agency. 8 February 2021. Retrieved 6 October 2024.
  4. ^ a b Pearson, S. Forbes. "Refrigerants Past, Present and Future" (PDF). R744. Archived from the original (PDF) on 2018-07-13. Retrieved 2021-03-30.
  5. ^ a b c "Finally, a replacement for R123?". Cooling Post. 17 October 2013.
  6. ^ https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/download/3297/1244/
  7. ^ a b Tomczyk, John (1 May 2017). "What's the Latest with R-404A?". achrnews.com.
  8. ^ Molina, Mario J.; Rowland, F. S (28 June 1974). "Stratospheric sink for chlorofluoromethanes: chlorine catalysed destruction of ozone" (PDF). Nature. 249: 810–812. doi:10.1038/249810a0. Retrieved October 6, 2024.
  9. ^ National Research Council (1976). Halocarbons: Effects on Stratospheric Ozone. Washington, DC: The National Academies Press. doi:10.17226/19978. ISBN 978-0-309-02532-4. Retrieved October 6, 2024.
  10. ^ "Air Conditioners, Dehumidifiers, and R-410A Refrigerant". Sylvane. 1 July 2011. Retrieved 27 July 2023.
  11. ^ Protection, United States Congress Senate Committee on Environment and Public Works Subcommittee on Environmental (May 14, 1987). "Clean Air Act Amendments of 1987: Hearings Before the Subcommittee on Environmental Protection of the Committee on Environment and Public Works, United States Senate, One Hundredth Congress, First Session, on S. 300, S. 321, S. 1351, and S. 1384 ..." U.S. Government Printing Office – via Google Books.
  12. ^ Fluorinated Hydrocarbons—Advances in Research and Application (2013 ed.). ScholarlyEditions. June 21, 2013. p. 179. ISBN 9781481675703 – via Google Books.
  13. ^ Whitman, Bill; Johnson, Bill; Tomczyk, John; Silberstein, Eugene (February 25, 2008). Refrigeration and Air Conditioning Technology. Cengage Learning. p. 171. ISBN 978-1111803223 – via Google Books.
  14. ^ "Scroll Chillers: Conversion from HCFC-22 to HFC-410A and HFC-407C" (PDF). Archived from the original (PDF) on 2021-07-20. Retrieved 2021-03-29.
  15. ^ "What's Happening With R-134a? | 2017-06-05 | ACHRNEWS | ACHR News". achrnews.com.
  16. ^ "Conversion R12/R134a" (PDF). Behr Hella Service GmbH. 1 October 2005. Retrieved 27 July 2023.
  17. ^ "R-407A Gains SNAP OK". achrnews.com (Press release). 22 June 2009.
  18. ^ "June 26, 2009: Emerson Approves R-407A, R-407C for Copeland Discus Compressors". achrnews.com.
  19. ^ "Taking New Refrigerants to the Peak". achrnews.com.
  20. ^ Koenig, H. (31 December 1995). "R502/R22 - replacement refrigerant R507 in commercial refrigeration; R502/R22 - Ersatzkaeltemittel R507 in der Gewerbekuehlung. Anwendungstechnik - Kaeltemittel".
  21. ^ Linton, J. W.; Snelson, W. K.; Triebe, A. R.; Hearty, P. F. (31 December 1995). "System performance comparison of R-507 with R-502". OSTI 211821.
  22. ^ "Daikin reveals details of R32 VRV air conditioner". Cooling Post. 6 February 2020.
  23. ^ a b "Refrigerant blends to challenge hydrocarbon efficiencies". Cooling Post. 22 December 2019.
  24. ^ "An HVAC Technician's Guide to R-454B". achrnews.com.
  25. ^ "The truth about new automotive A/C refrigerant R1234YF". 25 July 2018.
  26. ^ Kontomaris, Konstantinos (2014). "HFO-1336mzz-Z: High Temperature Chemical Stability and Use as A Working Fluid in Organic Rankine Cycles". International Refrigeration and Air Conditioning Conference. Paper 1525
  27. ^ "Trane adopts new low GWP refrigerant R514A". Cooling Post. 15 June 2016.
  28. ^ "R404A – the alternatives". Cooling Post. 26 February 2014.
  29. ^ "Carrier expands R1234ze chiller range". Cooling Post. 20 May 2020.
  30. ^ "Carrier confirms an HFO refrigerant future". Cooling Post. 5 June 2019.
  31. ^ "Greenfreeze: A revolution in domestic refrigeration". ecomall.com. Retrieved 2022-07-04.
  32. ^ a b "Happy birthday, Greenfreeze!". Greenpeace. 25 March 2013. Archived from the original on 2020-04-08. Retrieved 8 June 2015.
  33. ^ "Ozone Secretariat". United Nations Environment Programme. Archived from the original on 12 April 2015.
  34. ^ Gunkel, Christoph (13 September 2013). "Öko-Coup aus Ostdeutschland". Der Spiegel (in German). Retrieved 4 September 2015.
  35. ^ Maté, John (2001). "Making a Difference: A Case Study of the Greenpeace Ozone Campaign". Review of European Community & International Environmental Law. 10 (2): 190–198. doi:10.1111/1467-9388.00275.
  36. ^ Benedick, Richard Elliot Ozone Diplomacy Cambridge, MA: Harvard University 1991.
  37. ^ Honeywell International, Inc. (2010-07-09). "Comment on EPA Proposed Rule Office of Air and Radiation Proposed Significant New Alternatives Policy (SNAP) Protection of Stratospheric Ozone: Listing of Substitutes for Ozone-Depleting Substances – Hydrocarbon Refrigerants" (PDF).
  38. ^ "Discurso de Frank Guggenheim no lançamento do Greenfreeze | Brasil". Greenpeace.org. Archived from the original on 24 September 2015. Retrieved 10 June 2015.
  39. ^ "Der Greenfreeze - endlich in den USA angekommen". Greenpeace.de (in German). 28 December 2011. Retrieved 10 June 2015.
  40. ^ "Complying With The Section 608 Refrigerant Recycling Rule | Ozone Layer Protection - Regulatory Programs". Epa.gov. 21 April 2015. Retrieved 10 June 2015.
  41. ^ a b "Greenfreeze: a Revolution in Domestic Refrigeration". ecomall.com. Retrieved 8 June 2015.
  42. ^ "Company background". Archived from the original on 2020-02-20. Retrieved 2021-03-15.
  43. ^ Safeguarding the ozone layer and the global climate System: issues related to Hydrofluorocarbons and Perfluorocarbons (Report). IPCC/TEAP. 2005.
  44. ^ Crowley, Thomas J. (2000). "Causes of Climate Change over the Past 1000 Years". Science. 289 (5477): 270–277. Bibcode:2000Sci...289..270C. doi:10.1126/science.289.5477.270. PMID 10894770.
  45. ^ "2010 to 2015 government policy: environmental quality". GOV.UK. 8 May 2015. Retrieved 10 June 2015.
  46. ^ "PepsiCo Brings First Climate-Friendly Vending Machines to the U.S." phx.corporate-ir.net. Retrieved 8 June 2015.
  47. ^ "Climate-Friendly Greenfreezers Come to the United States". WNBC. 2 October 2008. Retrieved 8 June 2015.
  48. ^ Data, Reports and (7 August 2020). "Natural Refrigerants Market To Reach USD 2.88 Billion By 2027 | Reports and Data". GlobeNewswire News Room (Press release). Retrieved 17 December 2020.
  49. ^ Harris, Catharine. "Anti-inhalant Abuse Campaign Targets Building Codes: 'Huffing’ of Air Conditioning Refrigerant a Dangerous Risk." The Nation's Health. American Public Health Association, 2010. Web. 5 December 2010. https://www.thenationshealth.org/content/39/4/20
  50. ^ IPCC AR6 WG1 Ch7 2021
  51. ^ "GreenFreeze". Greenpeace.
  52. ^ "Significant New Alternatives Program: Substitutes in Household Refrigerators and Freezers". Epa.gov. 13 November 2014. Retrieved 4 June 2018.
  53. ^ Berwald, Juli (29 April 2019). "One overlooked way to fight climate change? Dispose of old CFCs". National Geographic - Environment. Archived from the original on April 29, 2019. Retrieved 30 April 2019.
  54. ^ Butler J. and Montzka S. (2020). "The NOAA Annual Greenhouse Gas Index (AGGI)". NOAA Global Monitoring Laboratory/Earth System Research Laboratories.
  55. ^ Environment, U. N. (31 October 2019). "New guidelines for air conditioners and refrigerators set to tackle climate change". UN Environment. Retrieved 30 March 2020.
  56. ^ Rosenthal, Elisabeth; Lehren, Andrew (20 June 2011). "Relief in Every Window, but Global Worry Too". The New York Times. Retrieved 21 June 2012.
  57. ^ a b Yadav et al 2022
  58. ^ a b c BSRIA 2020
  59. ^ a b c d e f g h IPCC AR5 WG1 Ch8 2013, pp. 714, 731–737
  60. ^ "European Commission on retrofit refrigerants for stationary applications" (PDF). Archived from the original on August 5, 2009. Retrieved 2010-10-29.cite web: CS1 maint: unfit URL (link)
  61. ^ "Protection of Stratospheric Ozone: Hydrocarbon Refrigerants" (PDF). Environment Protection Agency. Retrieved 5 August 2018.
  62. ^ ARB 2022
  63. ^ GM to Introduce HFO-1234yf AC Refrigerant in 2013 US Models
  64. ^ "The Coca-Cola Company Announces Adoption of HFC-Free Insulation in Refrigeration Units to Combat Global Warming". The Coca-Cola Company. 5 June 2006. Archived from the original on 1 November 2013. Retrieved 11 October 2007.
  65. ^ "Modine reinforces its CO2 research efforts". R744.com. 28 June 2007. Archived from the original on 10 February 2008.
  66. ^ Longo, Giovanni A.; Mancin, Simone; Righetti, Giulia; Zilio, Claudio (2015). "HFC32 vaporisation inside a Brazed Plate Heat Exchanger (BPHE): Experimental measurements and IR thermography analysis". International Journal of Refrigeration. 57: 77–86. doi:10.1016/j.ijrefrig.2015.04.017.
  67. ^ May 2010 TEAP XXI/9 Task Force Report
  68. ^ "Protecting Our Climate by Reducing Use of HFCs". US Environmental Protection Agency. 8 February 2021. Retrieved 25 August 2022.
  69. ^ "Background on HFCs and the AIM Act". www.usepa.gov. US EPA. March 2021. Retrieved 27 June 2024.
  70. ^ "1:Update on Ozone-Depleting Substances (ODSs) and Other Gases of Interest to the Montreal Protocol". Scientific assessment of ozone depletion: 2018 (PDF) (Global Ozone Research and Monitoring Project–Report No. 58 ed.). Geneva, Switzerland: World Meteorological Organization. 2018. p. 1.10. ISBN 978-1-7329317-1-8. Retrieved 22 November 2020.
  71. ^ [1] Chemours M099 as R22 Replacement
  72. ^ [2] Management of HCFC-123 through the Phaseout and Beyond | EPA | Published August 2020 | Retrieved Dec. 18, 2021
  73. ^ [3] Refrigerant R11 (R-11), Freon 11 (Freon R-11) Properties & Replacement
  74. ^ [4] R-454B XL41 refrigerant fact & info sheet
  75. ^ [5] R-454B emerges as a replacement for R-410A | ACHR News (Air Conditioning, Heating, Refrigeration News)
  76. ^ [6] Ccarrier introduces [R-454B] Puron Advance™ as the next generation refrigerant for ducted residential, light commercial products in North America | Indianapolis - 19 December 2018
  77. ^ [7] Johnson Controls selects R-454B as future refrigerant for new HVAC equipment | 27 May 2021
  78. ^ [8] A conversation on refrigerants | ASHRAE Journal, March 2021 | page 30, column 1, paragraph 2
  79. ^ [9] Opteon™ XP30 (R-514A) refrigerant
  80. ^ [10] Trane adopts new low GWP refrigerant R514A | 15 June 2016
  81. ^ "Emissions of Greenhouse Gases in the United States 1998 - Executive Summary". 18 August 2000. Archived from the original on 18 August 2000.
  82. ^ "Frequently Asked Questions on Section 608". Environment Protection Agency. Retrieved 20 December 2013.
  83. ^ "US hydrocarbons". Retrieved 5 August 2018.
  84. ^ "42 U.S. Code § 7671g - National recycling and emission reduction program". LII / Legal Information Institute.
  85. ^ ASHRAE; UNEP (Nov 2022). "Designation and Safety Classification of Refrigerants" (PDF). ASHRAE. Retrieved 1 July 2023.
  86. ^ "Update on New Refrigerants Designations and Safety Classifications" (PDF). American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). April 2020. Archived from the original (PDF) on February 13, 2023. Retrieved October 22, 2022.
 

Sources

[edit]

IPCC reports

[edit]
  • IPCC (2013). Stocker, T. F.; Qin, D.; Plattner, G.-K.; Tignor, M.; et al. (eds.). Climate Change 2013: The Physical Science Basis (PDF). Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, United Kingdom and New York, NY, USA: Cambridge University Press. ISBN 978-1-107-05799-9. (pb: 978-1-107-66182-0). Fifth Assessment Report - Climate Change 2013
    • Myhre, G.; Shindell, D.; Bréon, F.-M.; Collins, W.; et al. (2013). "Chapter 8: Anthropogenic and Natural Radiative Forcing" (PDF). Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. pp. 659–740.
  • IPCC (2021). Masson-Delmotte, V.; Zhai, P.; Pirani, A.; Connors, S. L.; et al. (eds.). Climate Change 2021: The Physical Science Basis (PDF). Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press (In Press).
  • Forster, Piers; Storelvmo, Trude (2021). "Chapter 7: The Earth's Energy Budget, Climate Feedbacks, and Climate Sensitivity" (PDF). IPCC AR6 WG1 2021.

Other

[edit]
  • "High GWP refrigerants". California Air Resources Board. Retrieved 13 February 2022.
  • "BSRIA's view on refrigerant trends in AC and Heat Pump segments". 2020. Retrieved 2022-02-14.
  • Yadav, Saurabh; Liu, Jie; Kim, Sung Chul (2022). "A comprehensive study on 21st-century refrigerants - R290 and R1234yf: A review". International Journal of Heat and Mass Transfer. 122: 121947. Bibcode:2022IJHMT.18221947Y. doi:10.1016/j.ijheatmasstransfer.2021.121947. S2CID 240534198.
[edit]
  • US Environmental Protection Agency page on the GWPs of various substances
  • Green Cooling Initiative on alternative natural refrigerants cooling technologies
  • International Institute of Refrigeration Archived 2018-09-25 at the Wayback Machine

 

 

An ab anbar (water reservoir) with double domes and windcatchers (openings near the top of the towers) in the central desert city of Naeen, Iran. Windcatchers are a form of natural ventilation.[1]

Ventilation is the intentional introduction of outdoor air into a space. Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants; it can also be used to control indoor temperature, humidity, and air motion to benefit thermal comfort, satisfaction with other aspects of the indoor environment, or other objectives.

The intentional introduction of outdoor air is usually categorized as either mechanical ventilation, natural ventilation, or mixed-mode ventilation.[2]

  • Mechanical ventilation is the intentional fan-driven flow of outdoor air into and/or out from a building. Mechanical ventilation systems may include supply fans (which push outdoor air into a building), exhaust[3] fans (which draw air out of a building and thereby cause equal ventilation flow into a building), or a combination of both (called balanced ventilation if it neither pressurizes nor depressurizes the inside air,[3] or only slightly depressurizes it). Mechanical ventilation is often provided by equipment that is also used to heat and cool a space.
  • Natural ventilation is the intentional passive flow of outdoor air into a building through planned openings (such as louvers, doors, and windows). Natural ventilation does not require mechanical systems to move outdoor air. Instead, it relies entirely on passive physical phenomena, such as wind pressure, or the stack effect. Natural ventilation openings may be fixed, or adjustable. Adjustable openings may be controlled automatically (automated), owned by occupants (operable), or a combination of both. Cross ventilation is a phenomenon of natural ventilation.
  • Mixed-mode ventilation systems use both mechanical and natural processes. The mechanical and natural components may be used at the same time, at different times of day, or in different seasons of the year.[4] Since natural ventilation flow depends on environmental conditions, it may not always provide an appropriate amount of ventilation. In this case, mechanical systems may be used to supplement or regulate the naturally driven flow.

Ventilation is typically described as separate from infiltration.

  • Infiltration is the circumstantial flow of air from outdoors to indoors through leaks (unplanned openings) in a building envelope. When a building design relies on infiltration to maintain indoor air quality, this flow has been referred to as adventitious ventilation.[5]

The design of buildings that promote occupant health and well-being requires a clear understanding of the ways that ventilation airflow interacts with, dilutes, displaces, or introduces pollutants within the occupied space. Although ventilation is an integral component of maintaining good indoor air quality, it may not be satisfactory alone.[6] A clear understanding of both indoor and outdoor air quality parameters is needed to improve the performance of ventilation in terms of occupant health and energy.[7] In scenarios where outdoor pollution would deteriorate indoor air quality, other treatment devices such as filtration may also be necessary.[8] In kitchen ventilation systems, or for laboratory fume hoods, the design of effective effluent capture can be more important than the bulk amount of ventilation in a space. More generally, the way that an air distribution system causes ventilation to flow into and out of a space impacts the ability of a particular ventilation rate to remove internally generated pollutants. The ability of a system to reduce pollution in space is described as its "ventilation effectiveness". However, the overall impacts of ventilation on indoor air quality can depend on more complex factors such as the sources of pollution, and the ways that activities and airflow interact to affect occupant exposure.

An array of factors related to the design and operation of ventilation systems are regulated by various codes and standards. Standards dealing with the design and operation of ventilation systems to achieve acceptable indoor air quality include the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standards 62.1 and 62.2, the International Residential Code, the International Mechanical Code, and the United Kingdom Building Regulations Part F. Other standards that focus on energy conservation also impact the design and operation of ventilation systems, including ASHRAE Standard 90.1, and the International Energy Conservation Code.

When indoor and outdoor conditions are favorable, increasing ventilation beyond the minimum required for indoor air quality can significantly improve both indoor air quality and thermal comfort through ventilative cooling, which also helps reduce the energy demand of buildings.[9][10] During these times, higher ventilation rates, achieved through passive or mechanical means (air-side economizer, ventilative pre-cooling), can be particularly beneficial for enhancing people's physical health.[11] Conversely, when conditions are less favorable, maintaining or improving indoor air quality through ventilation may require increased use of mechanical heating or cooling, leading to higher energy consumption.

Ventilation should be considered for its relationship to "venting" for appliances and combustion equipment such as water heaters, furnaces, boilers, and wood stoves. Most importantly, building ventilation design must be careful to avoid the backdraft of combustion products from "naturally vented" appliances into the occupied space. This issue is of greater importance for buildings with more air-tight envelopes. To avoid the hazard, many modern combustion appliances utilize "direct venting" which draws combustion air directly from outdoors, instead of from the indoor environment.

Design of air flow in rooms

[edit]

The air in a room can be supplied and removed in several ways, for example via ceiling ventilation, cross ventilation, floor ventilation or displacement ventilation.[citation needed]

Furthermore, the air can be circulated in the room using vortexes which can be initiated in various ways:

Ventilation rates for indoor air quality

[edit]

The ventilation rate, for commercial, industrial, and institutional (CII) buildings, is normally expressed by the volumetric flow rate of outdoor air, introduced to the building. The typical units used are cubic feet per minute (CFM) in the imperial system, or liters per second (L/s) in the metric system (even though cubic meter per second is the preferred unit for volumetric flow rate in the SI system of units). The ventilation rate can also be expressed on a per person or per unit floor area basis, such as CFM/p or CFM/ft², or as air changes per hour (ACH).

Standards for residential buildings

[edit]

For residential buildings, which mostly rely on infiltration for meeting their ventilation needs, a common ventilation rate measure is the air change rate (or air changes per hour): the hourly ventilation rate divided by the volume of the space (I or ACH; units of 1/h). During the winter, ACH may range from 0.50 to 0.41 in a tightly air-sealed house to 1.11 to 1.47 in a loosely air-sealed house.[12]

ASHRAE now recommends ventilation rates dependent upon floor area, as a revision to the 62-2001 standard, in which the minimum ACH was 0.35, but no less than 15 CFM/person (7.1 L/s/person). As of 2003, the standard has been changed to 3 CFM/100 sq. ft. (15 L/s/100 sq. m.) plus 7.5 CFM/person (3.5 L/s/person).[13]

Standards for commercial buildings

[edit]

Ventilation rate procedure

[edit]

Ventilation Rate Procedure is rate based on standard and prescribes the rate at which ventilation air must be delivered to space and various means to the condition that air.[14] Air quality is assessed (through CO2 measurement) and ventilation rates are mathematically derived using constants. Indoor Air Quality Procedure uses one or more guidelines for the specification of acceptable concentrations of certain contaminants in indoor air but does not prescribe ventilation rates or air treatment methods.[14] This addresses both quantitative and subjective evaluations and is based on the Ventilation Rate Procedure. It also accounts for potential contaminants that may have no measured limits, or for which no limits are not set (such as formaldehyde off-gassing from carpet and furniture).

Natural ventilation

[edit]

Natural ventilation harnesses naturally available forces to supply and remove air in an enclosed space. Poor ventilation in rooms is identified to significantly increase the localized moldy smell in specific places of the room including room corners.[11] There are three types of natural ventilation occurring in buildings: wind-driven ventilation, pressure-driven flows, and stack ventilation.[15] The pressures generated by 'the stack effect' rely upon the buoyancy of heated or rising air. Wind-driven ventilation relies upon the force of the prevailing wind to pull and push air through the enclosed space as well as through breaches in the building's envelope.

Almost all historic buildings were ventilated naturally.[16] The technique was generally abandoned in larger US buildings during the late 20th century as the use of air conditioning became more widespread. However, with the advent of advanced Building Performance Simulation (BPS) software, improved Building Automation Systems (BAS), Leadership in Energy and Environmental Design (LEED) design requirements, and improved window manufacturing techniques; natural ventilation has made a resurgence in commercial buildings both globally and throughout the US.[17]

The benefits of natural ventilation include:

  • Improved indoor air quality (IAQ)
  • Energy savings
  • Reduction of greenhouse gas emissions
  • Occupant control
  • Reduction in occupant illness associated with sick building syndrome
  • Increased worker productivity

Techniques and architectural features used to ventilate buildings and structures naturally include, but are not limited to:

  • Operable windows
  • Clerestory windows and vented skylights
  • Lev/convection doors
  • Night purge ventilation
  • Building orientation
  • Wind capture façades

Airborne diseases

[edit]

Natural ventilation is a key factor in reducing the spread of airborne illnesses such as tuberculosis, the common cold, influenza, meningitis or COVID-19.[18] Opening doors and windows are good ways to maximize natural ventilation, which would make the risk of airborne contagion much lower than with costly and maintenance-requiring mechanical systems. Old-fashioned clinical areas with high ceilings and large windows provide the greatest protection. Natural ventilation costs little and is maintenance-free, and is particularly suited to limited-resource settings and tropical climates, where the burden of TB and institutional TB transmission is highest. In settings where respiratory isolation is difficult and climate permits, windows and doors should be opened to reduce the risk of airborne contagion. Natural ventilation requires little maintenance and is inexpensive.[19]

Natural ventilation is not practical in much of the infrastructure because of climate. This means that the facilities need to have effective mechanical ventilation systems and or use Ceiling Level UV or FAR UV ventilation systems.

Ventilation is measured in terms of air changes per hour (ACH). As of 2023, the CDC recommends that all spaces have a minimum of 5 ACH.[20] For hospital rooms with airborne contagions the CDC recommends a minimum of 12 ACH.[21] Challenges in facility ventilation are public unawareness,[22][23] ineffective government oversight, poor building codes that are based on comfort levels, poor system operations, poor maintenance, and lack of transparency.[24]

Pressure, both political and economic, to improve energy conservation has led to decreased ventilation rates. Heating, ventilation, and air conditioning rates have dropped since the energy crisis in the 1970s and the banning of cigarette smoke in the 1980s and 1990s.[25][26][better source needed]

Mechanical ventilation

[edit]
An axial belt-drive exhaust fan serving an underground car park. This exhaust fan's operation is interlocked with the concentration of contaminants emitted by internal combustion engines.

Mechanical ventilation of buildings and structures can be achieved by the use of the following techniques:

  • Whole-house ventilation
  • Mixing ventilation
  • Displacement ventilation
  • Dedicated subaerial air supply

Demand-controlled ventilation (DCV)

[edit]

Demand-controlled ventilation (DCV, also known as Demand Control Ventilation) makes it possible to maintain air quality while conserving energy.[27][28] ASHRAE has determined that "It is consistent with the ventilation rate procedure that demand control be permitted for use to reduce the total outdoor air supply during periods of less occupancy."[29] In a DCV system, CO2 sensors control the amount of ventilation.[30][31] During peak occupancy, CO2 levels rise, and the system adjusts to deliver the same amount of outdoor air as would be used by the ventilation-rate procedure.[32] However, when spaces are less occupied, CO2 levels reduce, and the system reduces ventilation to conserves energy. DCV is a well-established practice,[33] and is required in high occupancy spaces by building energy standards such as ASHRAE 90.1.[34]

Personalized ventilation

[edit]

Personalized ventilation is an air distribution strategy that allows individuals to control the amount of ventilation received. The approach delivers fresh air more directly to the breathing zone and aims to improve the air quality of inhaled air. Personalized ventilation provides much higher ventilation effectiveness than conventional mixing ventilation systems by displacing pollution from the breathing zone with far less air volume. Beyond improved air quality benefits, the strategy can also improve occupants' thermal comfort, perceived air quality, and overall satisfaction with the indoor environment. Individuals' preferences for temperature and air movement are not equal, and so traditional approaches to homogeneous environmental control have failed to achieve high occupant satisfaction. Techniques such as personalized ventilation facilitate control of a more diverse thermal environment that can improve thermal satisfaction for most occupants.

Local exhaust ventilation

[edit]

Local exhaust ventilation addresses the issue of avoiding the contamination of indoor air by specific high-emission sources by capturing airborne contaminants before they are spread into the environment. This can include water vapor control, lavatory effluent control, solvent vapors from industrial processes, and dust from wood- and metal-working machinery. Air can be exhausted through pressurized hoods or the use of fans and pressurizing a specific area.[35]
A local exhaust system is composed of five basic parts:

  1. A hood that captures the contaminant at its source
  2. Ducts for transporting the air
  3. An air-cleaning device that removes/minimizes the contaminant
  4. A fan that moves the air through the system
  5. An exhaust stack through which the contaminated air is discharged[35]

In the UK, the use of LEV systems has regulations set out by the Health and Safety Executive (HSE) which are referred to as the Control of Substances Hazardous to Health (CoSHH). Under CoSHH, legislation is set to protect users of LEV systems by ensuring that all equipment is tested at least every fourteen months to ensure the LEV systems are performing adequately. All parts of the system must be visually inspected and thoroughly tested and where any parts are found to be defective, the inspector must issue a red label to identify the defective part and the issue.

The owner of the LEV system must then have the defective parts repaired or replaced before the system can be used.

Smart ventilation

[edit]

Smart ventilation is a process of continually adjusting the ventilation system in time, and optionally by location, to provide the desired IAQ benefits while minimizing energy consumption, utility bills, and other non-IAQ costs (such as thermal discomfort or noise). A smart ventilation system adjusts ventilation rates in time or by location in a building to be responsive to one or more of the following: occupancy, outdoor thermal and air quality conditions, electricity grid needs, direct sensing of contaminants, operation of other air moving and air cleaning systems. In addition, smart ventilation systems can provide information to building owners, occupants, and managers on operational energy consumption and indoor air quality as well as a signal when systems need maintenance or repair. Being responsive to occupancy means that a smart ventilation system can adjust ventilation depending on demand such as reducing ventilation if the building is unoccupied. Smart ventilation can time-shift ventilation to periods when a) indoor-outdoor temperature differences are smaller (and away from peak outdoor temperatures and humidity), b) when indoor-outdoor temperatures are appropriate for ventilative cooling, or c) when outdoor air quality is acceptable. Being responsive to electricity grid needs means providing flexibility to electricity demand (including direct signals from utilities) and integration with electric grid control strategies. Smart ventilation systems can have sensors to detect airflow, systems pressures, or fan energy use in such a way that systems failures can be detected and repaired, as well as when system components need maintenance, such as filter replacement.[36]

Ventilation and combustion

[edit]

Combustion (in a fireplace, gas heater, candle, oil lamp, etc.) consumes oxygen while producing carbon dioxide and other unhealthy gases and smoke, requiring ventilation air. An open chimney promotes infiltration (i.e. natural ventilation) because of the negative pressure change induced by the buoyant, warmer air leaving through the chimney. The warm air is typically replaced by heavier, cold air.

Ventilation in a structure is also needed for removing water vapor produced by respiration, burning, and cooking, and for removing odors. If water vapor is permitted to accumulate, it may damage the structure, insulation, or finishes. [citation needed] When operating, an air conditioner usually removes excess moisture from the air. A dehumidifier may also be appropriate for removing airborne moisture.

Calculation for acceptable ventilation rate

[edit]

Ventilation guidelines are based on the minimum ventilation rate required to maintain acceptable levels of effluents. Carbon dioxide is used as a reference point, as it is the gas of highest emission at a relatively constant value of 0.005 L/s. The mass balance equation is:

Q = G/(Ci − Ca)

  • Q = ventilation rate (L/s)
  • G = CO2 generation rate
  • Ci = acceptable indoor CO2 concentration
  • Ca = ambient CO2 concentration[37]

Smoking and ventilation

[edit]

ASHRAE standard 62 states that air removed from an area with environmental tobacco smoke shall not be recirculated into ETS-free air. A space with ETS requires more ventilation to achieve similar perceived air quality to that of a non-smoking environment.

The amount of ventilation in an ETS area is equal to the amount of an ETS-free area plus the amount V, where:

V = DSD × VA × A/60E

  • V = recommended extra flow rate in CFM (L/s)
  • DSD = design smoking density (estimated number of cigarettes smoked per hour per unit area)
  • VA = volume of ventilation air per cigarette for the room being designed (ft3/cig)
  • E = contaminant removal effectiveness[38]

History

[edit]
This ancient Roman house uses a variety of passive cooling and passive ventilation techniques. Heavy masonry walls, small exterior windows, and a narrow walled garden oriented N-S shade the house, preventing heat gain. The house opens onto a central atrium with an impluvium (open to the sky); the evaporative cooling of the water causes a cross-draft from atrium to garden.

Primitive ventilation systems were found at the Pločnik archeological site (belonging to the Vinča culture) in Serbia and were built into early copper smelting furnaces. The furnace, built on the outside of the workshop, featured earthen pipe-like air vents with hundreds of tiny holes in them and a prototype chimney to ensure air goes into the furnace to feed the fire and smoke comes out safely.[39]

Passive ventilation and passive cooling systems were widely written about around the Mediterranean by Classical times. Both sources of heat and sources of cooling (such as fountains and subterranean heat reservoirs) were used to drive air circulation, and buildings were designed to encourage or exclude drafts, according to climate and function. Public bathhouses were often particularly sophisticated in their heating and cooling. Icehouses are some millennia old, and were part of a well-developed ice industry by classical times.

The development of forced ventilation was spurred by the common belief in the late 18th and early 19th century in the miasma theory of disease, where stagnant 'airs' were thought to spread illness. An early method of ventilation was the use of a ventilating fire near an air vent which would forcibly cause the air in the building to circulate. English engineer John Theophilus Desaguliers provided an early example of this when he installed ventilating fires in the air tubes on the roof of the House of Commons. Starting with the Covent Garden Theatre, gas burning chandeliers on the ceiling were often specially designed to perform a ventilating role.

Mechanical systems

[edit]
The Central Tower of the Palace of Westminster. This octagonal spire was for ventilation purposes, in the more complex system imposed by Reid on Barry, in which it was to draw air out of the Palace. The design was for the aesthetic disguise of its function.[40][41]

A more sophisticated system involving the use of mechanical equipment to circulate the air was developed in the mid-19th century. A basic system of bellows was put in place to ventilate Newgate Prison and outlying buildings, by the engineer Stephen Hales in the mid-1700s. The problem with these early devices was that they required constant human labor to operate. David Boswell Reid was called to testify before a Parliamentary committee on proposed architectural designs for the new House of Commons, after the old one burned down in a fire in 1834.[40] In January 1840 Reid was appointed by the committee for the House of Lords dealing with the construction of the replacement for the Houses of Parliament. The post was in the capacity of ventilation engineer, in effect; and with its creation there began a long series of quarrels between Reid and Charles Barry, the architect.[42]

Reid advocated the installation of a very advanced ventilation system in the new House. His design had air being drawn into an underground chamber, where it would undergo either heating or cooling. It would then ascend into the chamber through thousands of small holes drilled into the floor, and would be extracted through the ceiling by a special ventilation fire within a great stack.[43]

Reid's reputation was made by his work in Westminster. He was commissioned for an air quality survey in 1837 by the Leeds and Selby Railway in their tunnel.[44] The steam vessels built for the Niger expedition of 1841 were fitted with ventilation systems based on Reid's Westminster model.[45] Air was dried, filtered and passed over charcoal.[46][47] Reid's ventilation method was also applied more fully to St. George's Hall, Liverpool, where the architect, Harvey Lonsdale Elmes, requested that Reid should be involved in ventilation design.[48] Reid considered this the only building in which his system was completely carried out.[49]

Fans

[edit]

With the advent of practical steam power, ceiling fans could finally be used for ventilation. Reid installed four steam-powered fans in the ceiling of St George's Hospital in Liverpool, so that the pressure produced by the fans would force the incoming air upward and through vents in the ceiling. Reid's pioneering work provides the basis for ventilation systems to this day.[43] He was remembered as "Dr. Reid the ventilator" in the twenty-first century in discussions of energy efficiency, by Lord Wade of Chorlton.[50]

History and development of ventilation rate standards

[edit]

Ventilating a space with fresh air aims to avoid "bad air". The study of what constitutes bad air dates back to the 1600s when the scientist Mayow studied asphyxia of animals in confined bottles.[51] The poisonous component of air was later identified as carbon dioxide (CO2), by Lavoisier in the very late 1700s, starting a debate as to the nature of "bad air" which humans perceive to be stuffy or unpleasant. Early hypotheses included excess concentrations of CO2 and oxygen depletion. However, by the late 1800s, scientists thought biological contamination, not oxygen or CO2, was the primary component of unacceptable indoor air. However, it was noted as early as 1872 that CO2 concentration closely correlates to perceived air quality.

The first estimate of minimum ventilation rates was developed by Tredgold in 1836.[52] This was followed by subsequent studies on the topic by Billings [53] in 1886 and Flugge in 1905. The recommendations of Billings and Flugge were incorporated into numerous building codes from 1900–the 1920s and published as an industry standard by ASHVE (the predecessor to ASHRAE) in 1914.[51]

The study continued into the varied effects of thermal comfort, oxygen, carbon dioxide, and biological contaminants. The research was conducted with human subjects in controlled test chambers. Two studies, published between 1909 and 1911, showed that carbon dioxide was not the offending component. Subjects remained satisfied in chambers with high levels of CO2, so long as the chamber remained cool.[51] (Subsequently, it has been determined that CO2 is, in fact, harmful at concentrations over 50,000ppm[54])

ASHVE began a robust research effort in 1919. By 1935, ASHVE-funded research conducted by Lemberg, Brandt, and Morse – again using human subjects in test chambers – suggested the primary component of "bad air" was an odor, perceived by the human olfactory nerves.[55] Human response to odor was found to be logarithmic to contaminant concentrations, and related to temperature. At lower, more comfortable temperatures, lower ventilation rates were satisfactory. A 1936 human test chamber study by Yaglou, Riley, and Coggins culminated much of this effort, considering odor, room volume, occupant age, cooling equipment effects, and recirculated air implications, which guided ventilation rates.[56] The Yaglou research has been validated, and adopted into industry standards, beginning with the ASA code in 1946. From this research base, ASHRAE (having replaced ASHVE) developed space-by-space recommendations, and published them as ASHRAE Standard 62-1975: Ventilation for acceptable indoor air quality.

As more architecture incorporated mechanical ventilation, the cost of outdoor air ventilation came under some scrutiny. In 1973, in response to the 1973 oil crisis and conservation concerns, ASHRAE Standards 62-73 and 62–81) reduced required ventilation from 10 CFM (4.76 L/s) per person to 5 CFM (2.37 L/s) per person. In cold, warm, humid, or dusty climates, it is preferable to minimize ventilation with outdoor air to conserve energy, cost, or filtration. This critique (e.g. Tiller[57]) led ASHRAE to reduce outdoor ventilation rates in 1981, particularly in non-smoking areas. However subsequent research by Fanger,[58] W. Cain, and Janssen validated the Yaglou model. The reduced ventilation rates were found to be a contributing factor to sick building syndrome.[59]

The 1989 ASHRAE standard (Standard 62–89) states that appropriate ventilation guidelines are 20 CFM (9.2 L/s) per person in an office building, and 15 CFM (7.1 L/s) per person for schools, while 2004 Standard 62.1-2004 has lower recommendations again (see tables below). ANSI/ASHRAE (Standard 62–89) speculated that "comfort (odor) criteria are likely to be satisfied if the ventilation rate is set so that 1,000 ppm CO2 is not exceeded"[60] while OSHA has set a limit of 5000 ppm over 8 hours.[61]

Historical ventilation rates
Author or source Year Ventilation rate (IP) Ventilation rate (SI) Basis or rationale
Tredgold 1836 4 CFM per person 2 L/s per person Basic metabolic needs, breathing rate, and candle burning
Billings 1895 30 CFM per person 15 L/s per person Indoor air hygiene, preventing spread of disease
Flugge 1905 30 CFM per person 15 L/s per person Excessive temperature or unpleasant odor
ASHVE 1914 30 CFM per person 15 L/s per person Based on Billings, Flugge and contemporaries
Early US Codes 1925 30 CFM per person 15 L/s per person Same as above
Yaglou 1936 15 CFM per person 7.5 L/s per person Odor control, outdoor air as a fraction of total air
ASA 1946 15 CFM per person 7.5 L/s per person Based on Yahlou and contemporaries
ASHRAE 1975 15 CFM per person 7.5 L/s per person Same as above
ASHRAE 1981 10 CFM per person 5 L/s per person For non-smoking areas, reduced.
ASHRAE 1989 15 CFM per person 7.5 L/s per person Based on Fanger, W. Cain, and Janssen

ASHRAE continues to publish space-by-space ventilation rate recommendations, which are decided by a consensus committee of industry experts. The modern descendants of ASHRAE standard 62-1975 are ASHRAE Standard 62.1, for non-residential spaces, and ASHRAE 62.2 for residences.

In 2004, the calculation method was revised to include both an occupant-based contamination component and an area–based contamination component.[62] These two components are additive, to arrive at an overall ventilation rate. The change was made to recognize that densely populated areas were sometimes overventilated (leading to higher energy and cost) using a per-person methodology.

Occupant Based Ventilation Rates,[62] ANSI/ASHRAE Standard 62.1-2004

IP Units SI Units Category Examples
0 cfm/person 0 L/s/person Spaces where ventilation requirements are primarily associated with building elements, not occupants. Storage Rooms, Warehouses
5 cfm/person 2.5 L/s/person Spaces occupied by adults, engaged in low levels of activity Office space
7.5 cfm/person 3.5 L/s/person Spaces where occupants are engaged in higher levels of activity, but not strenuous, or activities generating more contaminants Retail spaces, lobbies
10 cfm/person 5 L/s/person Spaces where occupants are engaged in more strenuous activity, but not exercise, or activities generating more contaminants Classrooms, school settings
20 cfm/person 10 L/s/person Spaces where occupants are engaged in exercise, or activities generating many contaminants dance floors, exercise rooms

Area-based ventilation rates,[62] ANSI/ASHRAE Standard 62.1-2004

IP Units SI Units Category Examples
0.06 cfm/ft2 0.30 L/s/m2 Spaces where space contamination is normal, or similar to an office environment Conference rooms, lobbies
0.12 cfm/ft2 0.60 L/s/m2 Spaces where space contamination is significantly higher than an office environment Classrooms, museums
0.18 cfm/ft2 0.90 L/s/m2 Spaces where space contamination is even higher than the previous category Laboratories, art classrooms
0.30 cfm/ft2 1.5 L/s/m2 Specific spaces in sports or entertainment where contaminants are released Sports, entertainment
0.48 cfm/ft2 2.4 L/s/m2 Reserved for indoor swimming areas, where chemical concentrations are high Indoor swimming areas

The addition of occupant- and area-based ventilation rates found in the tables above often results in significantly reduced rates compared to the former standard. This is compensated in other sections of the standard which require that this minimum amount of air is delivered to the breathing zone of the individual occupant at all times. The total outdoor air intake of the ventilation system (in multiple-zone variable air volume (VAV) systems) might therefore be similar to the airflow required by the 1989 standard.
From 1999 to 2010, there was considerable development of the application protocol for ventilation rates. These advancements address occupant- and process-based ventilation rates, room ventilation effectiveness, and system ventilation effectiveness[63]

Problems

[edit]
  • In hot, humid climates, unconditioned ventilation air can daily deliver approximately 260 milliliters of water for each cubic meters per hour (m3/h) of outdoor air (or one pound of water each day for each cubic feet per minute of outdoor air per day), annual average.[citation needed] This is a great deal of moisture and can create serious indoor moisture and mold problems. For example, given a 150 m2 building with an airflow of 180 m3/h this could result in about 47 liters of water accumulated per day.
  • Ventilation efficiency is determined by design and layout, and is dependent upon the placement and proximity of diffusers and return air outlets. If they are located closely together, supply air may mix with stale air, decreasing the efficiency of the HVAC system, and creating air quality problems.
  • System imbalances occur when components of the HVAC system are improperly adjusted or installed and can create pressure differences (too much-circulating air creating a draft or too little circulating air creating stagnancy).
  • Cross-contamination occurs when pressure differences arise, forcing potentially contaminated air from one zone to an uncontaminated zone. This often involves undesired odors or VOCs.
  • Re-entry of exhaust air occurs when exhaust outlets and fresh air intakes are either too close, prevailing winds change exhaust patterns or infiltration between intake and exhaust air flows.
  • Entrainment of contaminated outdoor air through intake flows will result in indoor air contamination. There are a variety of contaminated air sources, ranging from industrial effluent to VOCs put off by nearby construction work.[64] A recent study revealed that in urban European buildings equipped with ventilation systems lacking outdoor air filtration, the exposure to outdoor-originating pollutants indoors resulted in more Disability-Adjusted Life Years (DALYs) than exposure to indoor-emitted pollutants.[65]

See also

[edit]
  • Architectural engineering
  • Biological safety
  • Cleanroom
  • Environmental tobacco smoke
  • Fume hood
  • Head-end power
  • Heating, ventilation, and air conditioning
  • Heat recovery ventilation
  • Mechanical engineering
  • Room air distribution
  • Sick building syndrome
  • Siheyuan
  • Solar chimney
  • Tulou
  • Windcatcher

References

[edit]
  1. ^ Malone, Alanna. "The Windcatcher House". Architectural Record: Building for Social Change. McGraw-Hill. Archived from the original on 22 April 2012.
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  3. ^ a b Whole-House Ventilation | Department of Energy
  4. ^ de Gids W.F., Jicha M., 2010. "Ventilation Information Paper 32: Hybrid Ventilation Archived 2015-11-17 at the Wayback Machine", Air Infiltration and Ventilation Centre (AIVC), 2010
  5. ^ Schiavon, Stefano (2014). "Adventitious ventilation: a new definition for an old mode?". Indoor Air. 24 (6): 557–558. Bibcode:2014InAir..24..557S. doi:10.1111/ina.12155. ISSN 1600-0668. PMID 25376521.
  6. ^ ANSI/ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality, ASHRAE, Inc., Atlanta, GA, US
  7. ^ Belias, Evangelos; Licina, Dusan (2024). "European residential ventilation: Investigating the impact on health and energy demand". Energy and Buildings. 304. Bibcode:2024EneBu.30413839B. doi:10.1016/j.enbuild.2023.113839.
  8. ^ Belias, Evangelos; Licina, Dusan (2022). "Outdoor PM2. 5 air filtration: optimising indoor air quality and energy". Building & Cities. 3 (1): 186–203. doi:10.5334/bc.153.
  9. ^ Belias, Evangelos; Licina, Dusan (2024). "European residential ventilation: Investigating the impact on health and energy demand". Energy and Buildings. 304. Bibcode:2024EneBu.30413839B. doi:10.1016/j.enbuild.2023.113839.
  10. ^ Belias, Evangelos; Licina, Dusan (2023). "Influence of outdoor air pollution on European residential ventilative cooling potential". Energy and Buildings. 289. Bibcode:2023EneBu.28913044B. doi:10.1016/j.enbuild.2023.113044.
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  12. ^ Kavanaugh, Steve. Infiltration and Ventilation In Residential Structures. February 2004
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  56. ^ Yaglou CPE, Riley C, and Coggins DI. 1936. "Ventilation Requirements" ASHVE Transactions, v.32
  57. ^ Tiller, T.R. 1973. ASHRAE Transactions, v. 79
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  59. ^ Joshi, SM (2008). "The sick building syndrome". Indian J Occup Environ Med. 12 (2): 61–64. doi:10.4103/0019-5278.43262. PMC 2796751. PMID 20040980. in section 3 "Inadequate ventilation"
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  61. ^ Apte, Michael G. Associations between indoor CO2 concentrations and sick building syndrome symptoms in U.S. office buildings: an analysis of the 1994–1996 BASE study data." Indoor Air, Dec 2000: 246–58.
  62. ^ a b c Stanke D. 2006. "Explaining Science Behind Standard 62.1-2004". ASHRAE IAQ Applications, V7, Summer 2006. "Archived copy" (PDF). Archived from the original (PDF) on 14 July 2014. Retrieved 12 June 2014.cite web: CS1 maint: archived copy as title (link) accessed 11 June 2014
  63. ^ Stanke, DA. 2007. "Standard 62.1-2004: Stricter or Not?" ASHRAE IAQ Applications, Spring 2006. "Archived copy" (PDF). Archived from the original (PDF) on 14 July 2014. Retrieved 12 June 2014.cite web: CS1 maint: archived copy as title (link) accessed 11 June 2014
  64. ^ US EPA. Section 2: Factors Affecting Indoor Air Quality. "Archived copy" (PDF). Archived (PDF) from the original on 24 October 2008. Retrieved 30 April 2009.cite web: CS1 maint: archived copy as title (link)
  65. ^ Belias, Evangelos; Licina, Dusan (2024). "European residential ventilation: Investigating the impact on health and energy demand". Energy and Buildings. 304. Bibcode:2024EneBu.30413839B. doi:10.1016/j.enbuild.2023.113839.
[edit]

Air Infiltration & Ventilation Centre (AIVC)

[edit]
  • Publications from the Air Infiltration & Ventilation Centre (AIVC)

International Energy Agency (IEA) Energy in Buildings and Communities Programme (EBC)

[edit]
  • Publications from the International Energy Agency (IEA) Energy in Buildings and Communities Programme (EBC) ventilation-related research projects-annexes:
    • EBC Annex 9 Minimum Ventilation Rates
    • EBC Annex 18 Demand Controlled Ventilation Systems
    • EBC Annex 26 Energy Efficient Ventilation of Large Enclosures
    • EBC Annex 27 Evaluation and Demonstration of Domestic Ventilation Systems
    • EBC Annex 35 Control Strategies for Hybrid Ventilation in New and Retrofitted Office Buildings (HYBVENT)
    • EBC Annex 62 Ventilative Cooling

International Society of Indoor Air Quality and Climate

[edit]
  • Indoor Air Journal
  • Indoor Air Conference Proceedings

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

[edit]
  • ASHRAE Standard 62.1 – Ventilation for Acceptable Indoor Air Quality
  • ASHRAE Standard 62.2 – Ventilation for Acceptable Indoor Air Quality in Residential Buildings

 

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Driving Directions From Philbrook Museum of Art to Durham Supply Inc
Driving Directions From Philbrook Museum of Art to Durham Supply Inc

Reviews for Durham Supply Inc


Durham Supply Inc

Dennis Champion

(5)

Durham supply and Royal supply seems to find the most helpful and friendly people to work in their stores, we are based out of Kansas City out here for a few remodels and these guys treated us like we've gone there for years.

Durham Supply Inc

Ty Spears

(5)

Bought a door/storm door combo. Turns out it was the wrong size. They swapped it out, quick and easy no problems. Very helpful in explaining the size differences from standard door sizes.

Durham Supply Inc

B Mann

(5)

I was in need of some items for a double wide that I am remodeling and this place is the only place in town that had what I needed ( I didn't even try the other rude place )while I was there I learned the other place that was in Tulsa that also sold mobile home supplies went out of business (no wonder the last time I was in there they were VERY RUDE and high priced) I like the way Dunham does business they answered all my questions and got me the supplies I needed, very friendly, I will be back to purchase the rest of my items when the time comes.

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