Which of the following has the greatest direct impact on global warming?

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试卷: LEED GA模拟题B[查看]
Which of the following has the greatest direct impact on global warming?
A: SRI of a building”s roof
B: Building orientation
C: Chillers” operating efficiency
D: Use of natural refrigerants

参考答案: C

本题解释:
A item is an indirect impact because the roof does not contribute to global warming. The roof has an indirect impact by either requiring more/less fossil fuels to be burned to heat/cool the building; Building orientation has an indirect impact since the building”s orientation does not itself increase global warming. The orientation has an indirect impact by either requiring more/less fossil fuels to be burned to heat/cool the building;How efficiently HVAC equipment is directly impacts how much fossil fuel is burned to heat and cool a building;Natural refrigerants (Carbon dioxide, ammonia, propane) have no ozone depletion potential. Since these refrigerants are much less efficient than HCFCs or HFCs, more energy is needed to get the same refrigeration levels.

Equipment that burns more energy for cooling as a result of lower efficiency or the use of natural refrigerants can result in greater global warming. While natural refrigerants do not directly impact global warming, they indirectly impact global warming by requiring more energy to achieve lower refrigeration temperatures.
Reference: The Treatment by LEED of the Environmental Impact of HVAC Refrigerants