Approximately 50% of chillers in existing buildings use what refrigerant?

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试卷: LEED GA模拟题B[查看]
Approximately 50% of chillers in existing buildings use what refrigerant?

A: CFC-11
B: NH3
C: HCFC-22
D: HFC-23

参考答案: A

本题解释:
CFC-11 is used in chillers for about 50% of existing buildings. Nowadays it is encouraged to replace these systems with newer and more efficient systems that use more environmentally friendly refrigerants. Doing so would save money in the long term.Reference: The Treatment by LEED of the Environmental Impact of HVAC Refrigerants

A centrifugal chiller is one of the most economical means to cool large buildings. These units use water and a refrigeration cycle to provide cooling.