Adopted from the webinar this whitepaper is a briefing for refrigeration professionals – in particular, in commercial refrigeration equipment manufacturing – on the EPA’s new SNAP Rule 20:
Currently, technical issues prevent the inclusion of these products. For example, the charge limit for R290 (150 g) is too low. Furthermore, the high-glide refrigerants used may cause uneven cooling, which affects the formation of ice cubes.
Retrofitting here means removing a refrigerant and replacing it with another. It is important to note that it does not refer to equipment.
No single group of refrigerants is perfect across the whole range of applications. We need to look at more than just GWP. Safety, efficiency, other environmental effects, long atmospheric life, and life cycle are all important. Furthermore, there is a huge installed base of equipment that cannot be simply retrofitted to natural refrigerants.However, research is aimed at extending the application range of these products. Ultimately, the industry will rely on low-GWP refrigerants (e.g. HFOs, CO2, NH3, & HCs) as preferred solutions.
This is being examined, and will happen. However, the limit does depend on the application and its operating environment. For example, it is 57 g for household refrigeration and for most of the self-contained commercial refrigeration applications, the limit is 150 g. However, for mini-split applications the limit is more than 150 g. We understand that the EPA would welcome safety test information (e.g. from UL and the industry itself) that might enable it to raise the charge limit.
Yes, but note that for new medium-temperature stand-alone units, R134a is being delisted from 2019 or 2020 depending on the system’s Btu rating and evaporator design.
Approval is in place today for R407A and R407F. The approval process for R448A, R449A, R452A, and R513A is progressing and will be completed by the end of 2016.
We believe that manufacturers will not be able to keep doing this indefinitely. However, we are taking this question up with the EPA, and will keep the market informed on developments.
We are taking this question up with the EPA, and will keep the market informed on developments.
We are taking this apparent conflict up with the EPA, and will keep the market informed on developments.
We share this confusion. There is the issue that for equipment using flooded evaporators, many of the low-GWP refrigerants are high-glide, which can be problematic for such systems. Extra time is being given to overcome these challenges.