An ideal refrigeration machine has a fixed lower temperature. The COP of the machine
can be increased by _______.
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A.
decreasing the operating speed of the machine
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B.
increasing the higher temperature
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C.
increasing the operating speed of the machine
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D.
decreasing the higher temperature
Correct Answer:
D. decreasing the higher temperature
Explanation:
The coefficient of performance (COP) for an ideal refrigeration machine is defined by the formula COP = Tlow / (Thigh - Tlow), where Tlow is the temperature of the cold reservoir and Thigh is the temperature of the hot reservoir. Since Tlow is fixed in this scenario, the COP can be improved by reducing the denominator (Thigh - Tlow). This is achieved by decreasing the higher temperature (Thigh), which narrows the temperature gap between the two reservoirs and allows the system to operate more efficiently. Therefore, option D is the correct choice.
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