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A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co - efficient of performance ( COP

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?

Vapor compression cycle using expansion valve

Air refrigeration cycle

Vapor compression cycle using expansion engine

Carnot refrigeration cycle

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