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Consider an ideal vapor compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle?
- Coefficient of performance is higher than that of the original cycle.
- Coefficient of performance is lower than that of the original cycle.
- Coefficient of performance is the same as that of the original cycle.
- Refrigerating effect is lower than that of the original cycle.
Correct answer: Coefficient of performance is higher than that of the original cycle.
Solution
Replacing the throttling process with an isentropic expansion process improves the efficiency of the cycle, as isentropic expansion minimizes entropy generation and energy losses, resulting in a higher coefficient of performance.
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