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Question

A compressor receives 0.2 kg/s of R-134a at 250 kPa,-10C (h=393 kJ/kg) and delivers it at 1100 kPa. 90Cn (h=418 kJ/kg). The power input is measured to be 8 kW. The compressor has heat transfer to air at 100 kPa coming in at 20 C and leaving at 26C. The mass flow rate of air is _____ kg/s.

A
4.975kg/s
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B
0.4975kg/s
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C
0.6975kg/s
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D
2.4975kg/s
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Solution

The correct option is B 0.4975kg/s
From energy balance for compressor

˙m1h1+Win+˙mairh3=˙m2h2+˙mairh4



Treating air as ideal gas

h4h3=(CP)air(T4T3)

˙mair=˙m1(h1h2)+Win(CP)air(T4T3)=0.2(393418)+81.005(2620)

=0.4975kg/s

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