A piston–cylinder device contains 0.15 kg of air initially at 2 MPa and 350°C. The air is first expanded isothermally to 500 kPa, then compressed polytropically with a polytropic exponent of 1.2 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the boundary work for each process and the net work of the cycle.
A piston–cylinder device contains 0.15 kg of air initially at 2 MPa and 350°C. The air is first expanded isothermally to 500 kPa, then compressed polytropically with a polytropic exponent of 1.2 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the boundary work for each process and the net work of the cycle.
Chapter4: The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 86CP: A cylinder contains 500 g of helium at 120 atm and 20 . The valve is leaky, and all the gas slowly...
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A piston–cylinder device contains 0.15 kg of air initially
at 2 MPa and 350°C. The air is first expanded isothermally to
500 kPa, then compressed polytropically with a polytropic exponent
of 1.2 to the initial pressure, and finally compressed at the
constant pressure to the initial state. Determine the boundary
work for each process and the net work of the cycle.
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