I have some questions regarding refrigerators and expanders.
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A refrigerator uses the evaporation of liquid refrigerant to absorb heat from the environment, thereby cooling the heat exchange fluid. An expander directly performs expansion work on the pre-compressed fluid stream to achieve refrigeration. Question 1: Is the process of solid → liquid → gas an endothermic process? Temperature dropping? Question 2: Is the process of compressed gas turning into expanded gas an endothermic process? Temperature dropping? Question 3: Are all the temperatures mentioned above ambient temperatures?
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