Unformatted text preview: (b) Determine whether this cycle is a power cycle or refrigeration cycle. Determine the thermal eﬃciency. Problem 2.4* A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Constant Volume, V=0.01m 3 , U 2-U 1 = 25 kJ Process 2-3: Expansion with pV 1 . 2 = constant , U 2 = U 3 Process 3-1: Constant pressure, p=3.5 bar, W 31 =-25kJ The changes in kinetic and potential energy can be neglected for this process. (a) Sketch the cycle on a p-V diagram. (b) Calculate the net work of 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 or refrigeration cycle? Problem 2.29 from the textbook* For problems marked with * you need to use the Five Step methodology as outline in the homework policy. 1...
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- Spring '08
- Thermodynamics, 100 kPa, 3.5 bar, 25kj, 0 100 W