Which of the following has the minimum value of COP for a given refrigeration effect ?
Correct answer: D. Air refrigeration cycle
- A. Reverse Carnot cycle
- B. Ordinary vapour-compression cycle
- C. Vapour-compression process with a reversible expansion engine
- D. Air refrigeration cycle
Explanation
The reverse Carnot cycle gives the maximum COP between specified temperature limits, while regenerative or reversible expansion improves vapour-cycle performance. The air refrigeration cycle generally has the lowest COP because gas compression and expansion provide relatively little refrigeration effect per unit work.
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