Understanding A2L Refrigerants for Air Conditioners
ACHR News - 3. Finding the Right Alternative Refrigerants
Increasing Severity
of Combustion Event
Increasing Severity
Of Combustion Event
Legend:
Flammability Class
19
HOC
(MJ/kg)
0
BV
(m/s)
0.0
0.1
0.0
LFL
Increasing Probability
of Ignition Event
0.1
(kg/m³)
Flame Propagation
No Flame Propagation
3
2
Higher Flammability
Flammable
2L Lower Flammability
1
No Flame Propagation
100
51 GWP
of R410A is 1920 per AR5/WG1 Table 8.A.1 and 2090 per AR4/WG1 Table 2.14.
The Montreal Protocol and related regulations currently use GWP values published in the Fourth
Assessment Report (AR4, 2007) by the Intergovernmental Panel on Climate Change (IPCC), however
a future amendment will likely change to the Fifth Assessment Report (AR5, 2013) using updated
values based on more accurate scientific measurements, although relative uncertainty of GWP remains
about ±30% or ±35% for many refrigerants.
■FIGURE 2: Representation of ASHRAE Standard 34 refrigerant flammability classification.
Class 2L refrigerants have lower probability of ignition as well as lower severity of
ignition events, significantly reducing the flammability risk relative to Class 2 or 3.
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