(Please read in the headline and first sentence… five chemicals…instead of …six….)
HOUSTON (ICIS)--The US Environmental Protection Agency (EPA) is proposing that five chemicals − including three natural gas liquids (NGLs) − be added to a list of refrigerants that would pose less of a threat to the ozone layer and contribute less to global warming, the agency said on Friday.
The agency evaluates substitute chemicals and technologies that can be used in place of chemicals or hydrocarbons that damage the ozone layer or have high potential to contribute to global warming. The proposal would expand the list of approved substitutes, the EPA said.
After working with industry and environmental groups, the EPA is proposing to add chemical alternates for six refrigeration or air-conditioning applications.
Ethane would be approved for very low temperature refrigeration and non-mechanical heat transfer.
Isobutane would be approved for use in stand-alone commercial refrigerators, freezers and vending machines.
Propane would be approved for use in household refrigerators, freezers, vending machines and room air-conditioning units.
A hydrocarbon blend R-441A would be approved for use in commercial refrigerators and freezers, vending machines and room air conditioning units.
Hydrofluorocarbon 32 (HFC-32) would be approved for use in room air conditioning units.
After publication in the Federal Register, the EPA will accept public comment on the proposal for 60 days.