Refrigerant 22 became the refrigerant of choice for
Chapter 3, Problem 3.4D(choose chapter or problem)
Refrigerant 22 became the refrigerant of choice for residential heat pump and air conditioning systems after the 1987 Montreal Protocols banned chlorofluorocarbon (CFC) refrigerants in 1987. R-22 contains no chlorine, which was considered the primary contributor to atmospheric ozone depletion that gave rise to the phase-out of CFCs worldwide. However, R-22 is in a class of substances called hydrofluorocarbons (HCFCs) that are believed to contribute to global warming as well as having some ozone-depletion potential. As a result, HCFCs have also been banned and are being phased out. Write a report detailing the U.S. phase-out schedule for R-22 and listing the refrigerants that are being used to replace R-22 in residential systems. Include at least three references.
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