Monday 22 July 2013

Refrigerant that have the ozone-depleting potential (ODP) and global-warming potential (GWP)

CFC (chlorofluorocarbon)
CFC is a compound consisting of chlorine, fluorine and carbon. CFCs are very stable in the troposphere. They move to the stratosphere and are broken down by strong UV light, where they release chlorine atoms that then deplete the ozone layer. CFCs are commonly used as refrigerants, solvents, and foam blowing agents. The most common CFCs are CFC-11, CFC-12, CFC-113, CFC-114, and CFC-115. The ozone-depletion potential for each CFC is, respectively, 1, 1, 0.8, 1, and 0.6. 

HCFC (hydrochlorofluorocarbon)
HCFC is a compound consisting of hydrogen, chlorine, fluorine and carbon. The HCFCs are one class of chemicals being used to replace the CFCs. They contain chlorine and thus deplete stratospheric ozone, but to a much lesser extent than CFCs. HCFCs have ozone-depletion potentials ranging from 0.01 to 0.1.

HFC (hydrofluorocarbon)
HFC is a compound consisting hydrogen, fluorine and carbon. The HFCs are a class of replacements for CFCs. Because they do not contain chlorine or bromine, they do not deplete the ozone layer. All HFCs have an ozone-depletion potential of zero. But some of its have high on global-warming potentials.

HC (hydrocarbon)
HC is a compound consisting of carbon and hydrogen. Hydrocarbons include methane, ethane, propane, cyclopropane, butane, and cyclopentane. Although they are flammable, HCs may offer advantages as substitutes to ozone depleting substances because they have zero ozone-depletion potential, low toxicity, and with the exception of methane, have low global-warming potential.

Source: United States Environmental Protection Agency

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