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geordieman101
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Homework Statement
A compressor takes in 4 kg/s of air at atmospheric pressure and temperature, 1 bar and 25 degrees C. Air leaves the compressor at 4 bars and 200 degreesC. Calculate the power input to the compressor and its isentropic efficiency. For air Cp=1.005 and Cv=0.718 kJ/kg K
Answers: (703.5 kW, 0.83)
Homework Equations
(h2s - h1)/(h2-h1)
The Attempt at a Solution
I have already calculated the power input by using mass flow rate x Cp x delta T, however I am unable to find the isentropic efficiency. My attempt so far has been to divide Power input by mass flow rate to obtain h2-h1. The h2-h1 value i have obtained is 175.9kJ. I need help in finding h2s-h1.
I am doing this questions as exam preparation (this has nothing to do with coursework/homework) so maximum help would be very helpful.
Thanks