In a refrigerator the working fluid remains a gas throughout the cycle. Its work

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In a refrigerator the working fluid remains a gas throughout the cycle. Its working may be described in a greatly simplified form as a sequence of four steps as follows: 1 The fluid passes through the refrigerated compartment, where its temperature rises. During this step its volume remains constant. 2 The fluid passes through the compressor pump, where it is compressed adiabatically. 3 The fluid passes through the pipes behind the refrigerator, where its temperature falls. During this step its volume remains constant. 4 The fluid passes through the expansion valve, where it expands adiabatically. (a) Show these four steps on a P

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