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Question

In a 10 kW cooling capacity refrigeration system operating on VCRS, the refrigerant enters the evaporator with an enthalpy of 80 kJ/kg and leaves with an enthalpy of 180 kJ/kg. The enthalpy of the refrigerant after compression is 220 kJ/kg. The rate of heat transfer at the condenser is

A
21 kW
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B
7 kW
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C
3.5 kW
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D
14 kW
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Solution

The correct option is D 14 kW


10=˙m(h1h4)=˙m×(18080)

˙m=0.1kg/s

Heat rejected in condenser=h2h3

= 220 - 80 = 140 kJ/kg

Rate of heat transfer =0.1×140=14kW

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