The US Environmental Protection Agency (EPA) announced on December 13 that it has approved three hydrocarbon refrigerants as acceptable substitutes in household and small commercial stand-alone refrigerators and freezers.
The three hydrocarbons are:
R441A, a hydrocarbons blend also known as HCR188C.
The announcement comes a year-and-a-half after the publication of a proposed rule under the EPA’s Significant New Alternatives Policy (SNAP) program, and several years of efforts by end-users such as Unilever, and companies working with hydrocarbons such as A.S. Trust & Holdings, the company that invented refrigerant blend R441A.
“Replacing refrigerants such as CFC-12, HCFC-22, or HFCs will reduce greenhouse gas emissions by an estimated 600,000 metric tons by 2020, equal to the emissions from the annual electricity use of nearly 75,000 homes, and will help protect people’s health and the environment”, reads the US EPA announcement.
Refrigerant charge limits as outlined in proposed rule The SNAP final rule setting out the requirements for the use of hydrocarbons, including refrigerant charge size limits will only be issued later this week. The proposed rule (May 2010), provides an indication regarding the potential refrigerant charge size limits per refrigerant circuit, with the US EPA proposing levels that would reflect standards UL 250 and UL 471:
- Household refrigerators and freezers: 57grams (2.0 ounces), equivalent to approximately the charge size contained in two disposable lighters, and well below the international household refrigerator and freezers standard’s charge size limit of 150 grams (5.3 ounces)
- Retail food refrigeration in stand-alone units: 150 grams (5.3 ounces), equivalent to approximately the charge size contained in five disposable lighters or less, and in line with the IEC 60335-2-89 standard for commercial appliances, which has a charge size limit of 150 grams (5.3 ounces). The 57g charge size limit could prove a challenging one to meet, especially considering the large size of typical U.S. refrigerators.