The use of carbon dioxide (CO
2) as a refrigerant dates back more than a century, but CO
2 fell out of favor in the air-conditioning and refrigeration industry with the development and commercialization of chlorofluorocarbons (CFCs) in the 1930s. Shortly thereafter, hydrochlorofluorocarbons (HCFCs), such as HCFC-22, were developed. HCFC-22 eventually became the primary refrigerant for stationary air-conditioning systems. When concerns grew about the depletion of the stratospheric ozone layer in the 1970s, countries enacted agreements to phase out CFCs and HCFCs.
| File Size : | 1
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| Note : | This product is unavailable in Russia, Belarus |
| Number of Pages : | 2 |
| Product Code(s) : | D-22930 |
| Published : | 2004 |
