Core (Universal)第 8 / 240 题
R-22 is best classified as which type of refrigerant?
a.An HCFC, which has some ozone-depleting potential
b.A hydrofluorocarbon (HFC) with zero ozone depletion
c.A natural refrigerant
d.A hydrofluoroolefin (HFO) with very low GWP
解析
R-22 is a hydrochlorofluorocarbon (HCFC), which still contains chlorine and therefore has some ozone depletion potential, though less than a CFC. It is not an HFC, an HFO, or a natural refrigerant. Because HCFCs deplete ozone, R-22 was placed on a production and import phaseout schedule.
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