SSC JE Mechanical Engineering 25 Sep 2019 Shift 1 Paper

Question : 107 of 200

Marks: +1, -0

An ideal refrigerator maintains a temperature of – 23°C when placed inside a room at 27°C. Heat infiltration into the refrigeration is 0.5 kJ/s. The power required to pump the heat out is:

0.034 kW
0.45 kW
55 W
0.1 kW

Validate

Solution:

{T}_{1}=-23+273=250 { K}

{T}_{2}=27+273=300 {K}

{Q}_{1}=0.5 {kJ} \/ {s}

{COP}={{Q}_{1}}/{{W}}={{T}_{1}}/{{T}_{2}-{T}_{1}} \

⇒{0.5}{{W}}={250}/{300-250} \⇒{0.5}/{{W}}=5

{W}_{\text "in "}=0.1 {kJ} \/ {s}

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