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Question

0.70 kg/s of air enters the compressor with a specific enthalpy of 390 J/kg and leaves it with a specific enthalpy of 550\ J/kg. Velocity at inlet and exit are 8 m/s and 1 m/s respectively. Assuming adiabatic process, what is power input to the compressor?

A
80 W
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B
85 W
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C
90 W
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D
95 W
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Solution

The correct option is C 90 W
m=0.70kg/s

h1=390 J/kg

h2=550 J/kg

V1=8 m/s;V2=1 m/s

Using SFEE

h1+V212=h2+V222+Wm

390+822=550+122+W0.7

W=89.95W90 W

Negative sign indicates work is done in the system

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