What statement is true regarding the use of ammonia (NH3) as a refrigerant?

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试卷: LEED GA模拟题F[查看]
What statement is true regarding the use of ammonia (NH3) as a refrigerant?
A: HCFC has a lower ozone depletion potential (ODP) compared to NH3
B: NH3 is a type of hydrocarbon (HC)
C: NH3 is more likely to leak out of equipment compared to HFCs
D: The use of NH3 as a refrigerant can result in more climate change compared to HCFCs

参考答案: D

本题解释:
Notes:

Reference: The Treatment by LEED of the Environmental Impact of HVAC Refrigerants
A:HCFC has a higher ODP compared to NH3.
B: While NH3 is a type of natural refrigerant, it is not a hydrocarbon. Hydrocarbons are a group of natural refrigerants and include propane, butane, ethane, isobutene, and isopentane
C:The leakage rate of a refrigerant is related to best practices, regulations, and the pressure the refrigerant is under.
D: When looking at the reference material you may see that NH3 has a zero ODP and GWP compared to HCFCs. This is true for the direct impact on the ozone of NH3. Does NH3 released into the atmosphere cause ozone to be depleted? No. Does NH3 released into the atmosphere increase global warming? No.

HOWEVER - Refrigerants that are ozone friendly can cause more climate change. Why? Because it takes more electricity to create the same level of cooling as the more efficient refrigerants. If it takes twice as much electricity using NH3 to cool a building compared to using CFCs or HCFCs, the indirect release of CO2 from fossil fuels results in greater climate change.