A gas inside a piston-cylinder assembly undergoes the following sequence of processes:
1 → 2: Constant pressure expansion, with p1=p2=1.25 bar, V=0.02 m^3, and W12=10 kJ.
2 → 3: Compression with a pressure-volume relationship: p=750-6250V (where p is in kPa and V is in m^3), until V=0.02 m^3. Also, ∆U23=10 kJ.
3 → 1 Cooling with V3=V1=0.02 m^3 and a net\ decrease of internal energy, ∆U31=-25 kJ.
Treat the gas as a thermodynamic system and neglect any changes in kinetic and potential energy throughout the cycle. Determine:
1. The volume of gas at 2, V2 in m^3.
2. The total work for the cycle, Wcycle, in kJ.
3. The heat transfer for all three processes, respectively: Q12, Q23, and Q31 in kJ.
4. Whether this cycle is a power cycle or a refrigeration cycle. Determine its thermal efficiency, η (if it is a power cycle) or its coefficient of performance, β (if it is a refrigeration cycle). __________________________________________________________________________________________
Textbooks:
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Fundamentals of Engineering Thermodynamics 8th Edition (Wiley):
Moran, M. J., et. al., 2014, Fundamentals of Engineering Thermodynamics, 8th ed., Wiley, Hoboken, NJ.
Purchase a textbook here: [ Ссылка ]
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Engineering Mechanics Statics (Pearson):
Hibbeler, R. C. Engineering Mechanics Statics. Pearson Prentice Hall, Pearson Education, 2016.
Purchase a textbook here: [ Ссылка ]
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