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# A gas undergoes a thermodynamic cycle consisting of three processes: Process 1 2: constant volume, V = 0.028 m3, U2 - U1 = 26.4 kJ Process 2 3:...

A gas undergoes a thermodynamic cycle consisting of three processes: Process 1 2: constant volume, V = 0.028 m3, U2 - U1 = 26.4 kJ Process 2 3: expansion with pV = constant, U3 = U2 Process 3 1: constant pressure, p = 1.4 bar, W31 = -10.5 kJ There are no significant changes in kinetic or potential energy. (a) Sketch the cycle on a p V diagram. (b) Calculate the net work for the cycle, in kJ. (c) Calculate the heat transfer for process 2 3, in kJ. (d) Calculate the heat transfer for process 3 1, in kJ. (e) Is this a power cycle or a refrigeration cycle?

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Solutions
Process 1-2
V1=V2=0.028 m3
U2-U1= 26.4 KJ
Process 2-3
PV= Constant
U2=U3 or ΔU=0
Process 3-1
P1=P3=P= 1.4 Bar = 1.4 x 105 Pa
Or we can say
P1=P3=P= 140 KPa
W31= -10.5 KJ (b)...

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