SSC JE Mechanical Engineering 27 Oct 2020 Shift 2 Papers

Question : 112 of 200

Marks: +1, -0

The enthalpies at the beginning of compression, at the end of compression and at end of condensation are 180 kJ/kg, 200 kJ/kg and 90 kJ/kg respectively. Determine COP of the vapour compression refrigeration system.

Validate

Solution:

h_3 = h_4 = 90

kJ/kg,

h_1 = 180

kJ/kg,

h_2 = 200

kJ/kg

{COP}={\text "Refrigeration effect "}/{\text "Work done "}={{h}_{1}-{h}_{4}}/{{h}_{2}-{h}_{1}}

\∴{180-90}/{200-180} \⇒4.5

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