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  3. Using the information in the diagram, write a description of how a refrigerator works. You may use your own knowledge and experi

Using the information in the diagram, write a description of how a refrigerator works. You may use your own knowledge and experi

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问题     Using the information in the diagram, write a description of how a refrigerator works. You may use your own knowledge and experience in addition to the diagram.
   
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答案 The diagram shows in four stages how a refrigerator works. According to the diagram, in the first stage, high-pressure liquid flows in the capillary tube. Food within the refrigerator sends out vapor. In this stage, the high-pressure liquid is heated by the vapor to warm low-pressure gas. Next, the warm low-pressure gas flows ahead, arriving at the compressor. At this stage, it is compressed to hot high-pressure gas. Stage three of the process is when the hot high-pressure gas passes the condenser, where it is cooled to high-pressure liquid. Where is the heat then? It is transferred to atmosphere. Finally, the cool high-pressure liquid continues to flow forward and enters the capillary tube. At this point, it is heated by the vapor from food within the refrigerator again and a new cycle begins. Thus, the process diagram illustrates the principle of the refrigerator.
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