What is the effect of subcooling on the performance of a vapour compression
refrigeration cycle?
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A.
It decreases the refrigeration effect
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B.
It increases the condenser pressure
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C.
It increases the refrigeration effect
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D.
It reduces compressor work.
Correct Answer:
C. It increases the refrigeration effect
Explanation:
Subcooling in a vapour compression refrigeration cycle occurs when the liquid refrigerant is cooled below its saturation temperature at the condenser exit. This process increases the refrigeration effect because it reduces the enthalpy of the refrigerant entering the expansion valve. As a result, when the refrigerant undergoes expansion, a larger portion remains in the liquid phase, allowing it to absorb more heat during evaporation. In an ideal cycle, this improvement in cooling capacity is achieved without increasing the compressor's work input, thereby enhancing the overall coefficient of performance (COP).
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