Which refrigerants are considered environmentally benign?(choose 2)

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试卷: LEED GA模拟题A[查看]
Which refrigerants are considered environmentally benign?(choose 2)
A: Propane
B: Hydrocarbons
C: Hydrofluorocarbons
D: Halons

参考答案: AB

本题解释:
Propane is a type of hydrocarbon. Hydrocarbons are a classification of natural refrigerants which are benign to the environment;Hydrocarbons are a classification of natural refrigerants which are benign to the environment.Propane, butane, ethane, isobutene, and isopentane are types of hydrocarbons;HFCs (HydroFluoroCarbons) are not covered in the Montreal Protocol. These refrigerants have low Ozone Depletion Potential but typically high Global Warming Potential;Halons used to be used fire suppression systems until they were banned. Halons, CFCs, and HCFCs contribute to stratospheric ozone depletion.