What statement is true regarding halons?

PrincessWas

试卷: LEED GA模拟题F[查看]
What statement is true regarding halons?


A: Halons are a type of hydrocarbon
B: Halons absorb heat from a reservoir at low temperatures and reject heat at higher temperatures
C: Halons are commonly used in centrifugal chillers
D: Halons are substances that deplete the stratospheric ozone layer

参考答案: D

本题解释:
A Halons are not hydrocarbons because they do not contain hydrogen.
B Refrigerants (not Halons) are substances used to transfer heat during the mechanical cooling process within air conditioning and refrigerator systems. They act as the heat carrier which changes from gas to liquid and then back to gas in the refrigeration cycle.
C Halons are not refrigerants used in centrifugal chillers.
D Halons are used as fire extinguishing agents, both in built-in systems and in handheld portable fire extinguishers. Halon production in the U.S. ended on December 31, 1993, because they contribute to ozone depletion.