Question
Download Solution PDFThe coefficient of performance of a vapor compression refrigeration system:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
p - h and T-s diagram for ideal vapour compression refrigeration cycle are shown below,
The decrease in the evaporator pressure will not affect condensing temperature because the condensing temperature is a function of condensing pressure not of evaporator pressure. So, there is no change in the temperature of condenser.
From the p-h diagram:
Let pE1 and pE2 be the initial evaporator pressure and decreased evaporator pressure respectively.
At pE1,
W (Compressor work) = h2 – h1
RE (Refrigeration Effect) = h1 – h4
At pE2,
W’ (Compressor work) = h2’ – h1
RE’ (Refrigeration Effect) = h1’ – h4’
From the p-h diagram,
W’ > W, Compressor work is increased
RE’ < RE, Refrigeration effect is decreased
There is an increase in compressor work and a decrease in the refrigeration effect.
The coefficient of performance of a vapor compression refrigeration system decreases with the decrease in evaporator temperature at a fixed condenser temperature.
Last updated on Jul 15, 2025
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