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Air is compressed by a 34.6 kW compressor from P1 to P2. The air temperature is...

Air is compressed by a 34.6 kW compressor from P1 to P2. The air temperature is maintained constant at 34°C during this process as a result of heat transfer to the surrounding medium at 15°C. Determine (a) the rate of entropy change of the air, (b) the rate of entropy change of the surroundings, and (c) the rate of entropy generation. State the assumptions made in solving this problem. To check your work, enter the rate of entropy generation, in W/K to one decimal place, in the box below.  

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Answer #1

Just apply first law to compressor and get the heat transfer. Use this heat transfer to calculate entropy change. Remember entropy generation of a closed system is nothing but entropy change of universe.

Solution : Celven data- (Tair) Tinside = 34°C compressor 4Y I Tsum = 15°c W.D. = 3406kinl. Celven that temp remally const (ToAnsurer - from equations A, B & ©. ① Rate of entropy change of als = - 112.7 W/k . Rate of entropy change of sur = 120.1 W/k

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