Question

[1/28, 3:47 PM] Shikhar Pandey: 3 kg of air at 150 Kpa pressure and 360 K temperature is compressed

polytropically to pressure 750 Kpa according to the law 1.2=C

.Subsequently the air is cooled to initial temperature at constant

pressure.This is followed by expansion at constant temperature till the

original pressure of 150 Kpa is reached.Sketch the cycle on P-V and T-s

curve and determine the work done ,heat transfer and entropy change for

each process.Take =1.005 Kj/kgK, =0.718 Kj/kgK and R=0.287

Kj/kgK
[1/28, 3:47 PM] Shikhar Pandey: One kg of ice at -4°c is exposed to the atmosphere which is at 20°c. The ice

melts and comes into equilibrium with the atmosphere. Determine the

entropy increase of the universe. For ice take =2.09 Kj/kgK and latent

heat of fusion =333 Kj/kg

Proceed to calculate the minimum amount of work necessary to convert the

water back into ice at -4°c.​

Answer 1

Answer:

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