Air within a piston-cylinder assembly executes a Carnot

Chapter 5, Problem 5.80

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Air within a piston-cylinder assembly executes a Carnot  heat pump cycle, as shown in Fig 5.16. For the cycle, \(T_{\mathrm{H}}=600 \mathrm{\ K}\) and \(T_{\mathrm{C}}=300 \mathrm{\ K}\). The energy rejected by heat transfer  at 600 K has a magnitude of 250 kJ per kg of air. The pressure  at the start of the isothermal expansion is 325 kPa. Assuming  the ideal gas model for the air, determine (a) the magnitude  of the net work input, in kJ per kg of air, and (b) the pressure  at the end of the isothermal expansion, in kPa.

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