A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?
Correct answer: A. Carnot refrigeration cycle
- A. Carnot refrigeration cycle
- B. Air refrigeration cycle
- C. Vapor compression cycle using expansion engine
- D. Vapor compression cycle using expansion valve
Explanation
For fixed evaporator and condenser temperatures, the Carnot refrigerator has the maximum possible COP because it is fully reversible. Expansion valves and air cycles generate greater irreversibility, while an expansion engine only improves a vapour-compression cycle relative to throttling.
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