| Abstract: | With the mandate of Montreal Protocol banning ozone depleting substances, and Kyoto Protocol later on curtailing the use of
substances which contribute to global warming, conventional refrigerants are to be replaced by environment-friendly working
fluids. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are being substituted by hydrofluorocarbons (HFCs),
hydrofluorooelifins (HFOs), and a variety of mixtures. In view of the global warming potential of these newly synthesized
refrigerants, the recent trend is to go back to the originally used natural fluids such as ammonia, carbon dioxide, hydrocarbons,
water vapour, etc. In this article, various issues related to this changeover of refrigerants being used in vapour compression
refrigeration systems are discussed. |
