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GRE阅读题目解析:液态制冷剂

2017-03-20 09:54:00 来源:网络GRE资料下载

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  GRE阅读题目解析:液态制冷剂

  P1

  Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, low-pressure vapor, enters a compressor driven by an electric motor.The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid, confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second heat exchanger, the evaporator, which transfers heat from the air to the refrigerant, reducing the temperature of this second body of air. (126 words)

  1. According to the passage, the role of the flow restriction in a heat pump is to

  (A) measure accurately the flow rate of the refrigerant mass at that point

  (B) compress and heat the refrigerant vapor

  (C) bring about the evaporation and cooling of refrigerant

  (D) exchange heat between the refrigerant and the air at that point

  (E) reverse the direction of refrigerant flow when needed

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