Why is the work less for a lower inlet t

Reference no: EM131233490

1. Air flows through a constant-pressure heating device, as shown in Fig. P8.27. It is heated up in a reversible process with a work input of 85 Btu/lbm air flowing. The device exchanges heat with the ambient at 540 R. The air enters at 540 R, 60 lbf/in.2. Assuming constant specific heat, develop an expression for the exit temperature and solve for it.

2. An adiabatic and reversible air compressor takes air in at 15 psia, 560 R. The air exits at 90 psia at the rate of 0.8 lbm/s. Determine the minimum compressor work input and repeat for an inlet at 530 R instead. Why is the work less for a lower inlet T?

Reference no: EM131233490

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