RT null
T1 Technical progress on Protecting the Ozone Layer: Refrigeration, Air Conditioning and Heat Pumps Technical Options Report
A1 United Nations Environment Programme, 
K1 ozone layer
K1 refrigeration
K1 air-conditioning
K1 heat pump
YR 1989
FD 1989-06
LK https://wedocs.unep.org/handle/20.500.11822/29548
UL https://wedocs.unep.org/handle/20.500.11822/29548
NO The properties of refrigerants for use in the vapour compression cycle have been considered. The vast majority of present equipment utilizes the vapour compression cycle because of its simplicity and good efficiency. The dominance of this cycle is not likely to change simply due to the need to replace CFCs. A refrigerant must satisfy a set of criteria, including nonflammability and low toxicity, the need for favourable thermophysical properties, and other, more practical, considerations. Although many fluids and fluid types have been used as refrigerants in the past, halocarbons dominate today because their unique combination of properties best satisfy these sometimes conflicting requirements.
DS UN Environment Document Repository
RD Sep 17, 2026