Transcription of Chapter 5
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Chapter 5
5-9 Chapter 5 The maximum coefficient of performance b for the refrigeration cycle is given by b = CcycleQW = CHCQQQ-= CHCTTT- The maximum coefficient of performance gfor the heat pump cycle is given by g = HcycleQW = HHCQQQ-= HHCTTT- Example ---------------------------------------- ---------------------------------------- -- By steadily circulating a refrigerant at low temperature through passages in the walls of the freezer compartment, a refrigerator maintains the freezer compartment at 5 C when the air surrounding the refrigerator is at 22 C. The rate of heat transfer from the freezer compartment to the refrigerant is 8000 kJ/h and the power input required to operate the refrigerator is 3200 kJ/h. Determine the coefficient of performance of the refrigerator and compare with the coefficient of performance of a reversible refrigeration cycle operating between reservoirs at the same two temperatures.
5-9 Chapter 5 The maximum coefficient of performance b for the refrigeration cycle is given by b C= CC cycle Q W = H C Q Q-Q H C T T-T The maximum coefficient of performance gfor the heat pump cycle is given by g = H H cycle Q W = H C Q Q-Q H C T T-T Example 5.4-23. By steadily circulating a refrigerant at low temperature through …
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