Calculate the net work produced by this cycle, the required heat input to the cycle and its thermal efficiency. b) How much heat is removed (discharged) from the system during the cycle? c) Could the heat removed from this cycle be used to heat (or partial heat) 200 kg of water that is at an initial temperature of 293 K to a temperature of 372 K? Would you recommend designing a heat recovery for this purpose?
A piston cylinder device has a volume of 0.04 m3 and initially contains air at 293 K and 1 bar. This device is used to perform a cycle in which the gas is heated at a constant volume until the temperature reaches 1200 K. The air is allowed to expand following an isothermal process until the volume is 3.5 times the original volume. It is then cooled at a constant volume process. The last process the completes the cycle going back to the initial state with a process during which PV1.363 = constant. For the air, the specific heat is cv =0.790 kJ/(kg·K) = constant and its gas constant is Rg=0.287 kJ/(kg·K).
a) Calculate the net work produced by this cycle, the required heat input to the cycle and its thermal efficiency.
b) How much heat is removed (discharged) from the system during the cycle?
c) Could the heat removed from this cycle be used to heat (or partial heat) 200 kg of water that is at an initial temperature of 293 K to a temperature of 372 K? Would you recommend designing a heat recovery for this purpose?
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