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Question

# A single acting NH3 compressor follows the compression law (PV1.1=C). The operating pressure for the vapour compression refrigeration are: 2.3637 bar (−15∘C) and 11.671 bar (+30∘C). The enthalpy at the exit of compression is 1560 kJ/kg. If refrigerant enters dry saturated to the compressor, then what is the heat loss from the compressor? The refrigeration capacity of the refrigerator is 10 tons..

A
2.9kW
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B
29 KW
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C
65 KW
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D
6.5 KW
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Solution

## The correct option is A 2.9kW Refrigeration capacity, RC=m(h1−h4) 10×35=m(1444.19−342.08) m=0.03175 kg/s Work done per kg for compressor, wc=n(n−1)×p1×v1×⎡⎢⎣⎛⎜⎝p2p1n−1n⎞⎟⎠−1⎤⎥⎦ =1.1(1.1−1)×2.3637×102×0.50905×⎡⎢ ⎢⎣⎛⎜ ⎜⎝11.6712.36371.1−11.1⎞⎟ ⎟⎠−1⎤⎥ ⎥⎦ =206.7899 kJ/kg Apply SFEE to compressor, So, m2h1−Q=m2h2−wc −Q=(mh2−mh1)−206.7899×m Q=2.888 kW

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