SSC JE Mechanical Engineering 27 Sep 2019 Shift 1 Paper

Question : 168 of 200

Marks: +1, -0

A vapour compression refrigeration cycle with subcooling is shown in the figure along with refrigerant enthalpy data. The specific heat of the liquid refrigerant is 5 kJ/kg-K. What is the coefficient of performance of the cycle?

5.4
3.8
2.9
4.15

Validate

Solution:

Given:

{h}_{1}=220 {kJ} \/ {kg}, {h}_{2}=257 {kJ} \/ {kg},

{h}_{3}=87 {kJ} \/ {kg}

{h}_{3}{ }'={h}_{3}-{C}_{{p}}({T}_{3}-{T}_{3}/{ }')

=87-(5 \×5)=62 {kJ} \/ {kg}

{COP}={220-62}/{258-220}=4.15

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