In December 2020, congress passed American Innovation and Manufacturing Act and in 2021 EPA introduced rule mandating nationwide phasedown in high-global warming potential hydrofluorocarbon refrigerants by 2036.
The goal of this paper is to provide information on refrigerant classifications, the differences between refrigerants and the influences driving the shift away from traditional refrigerants to A2L refrigerants..
By several factors including how much refrigerant unit volume of air will support combustion, Regarding flammability, refrigerants are tested and categorized, the amount of energy needed to initiate combustion, the amount of energy released from combustion, and the rate of propagation.
Mildly A2Ls of HFCs, hydrofluoroolefins, and also blends of these two synthetic refrigerants.
While low amount of A3 refrigerant or low amount of A2 refrigerant in enclosed space can be very dangerous, A2L refrigerants require larger amount of gas leakage to reach sufficient concentrations necessary for ignition...
By the lower levels produced by static electricity, Hydrocarbon vapors such even sometimes.5 This can be orders of lower than the levels required to ignite A2L refrigerants.
Simply stated, you can think of HOC on the order of 19,905 Btu lb whereas A2 and A2L have much lower values on the order of 2700-4400 Btu lb.
The flammability limit of A2L refrigerants is very high, 10.
state and legislation will still need to allow the use of these more flammable refrigerants.
Except for few like Illinois and Texas, wide code process. For states without codes, legislation needs to pass guaranteeing the acceptance of A2L refrigerants approved by U.S.
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