1 two pounds of air initially at 200degf and 50 lbfin2

1. Two pounds of air initially at 200°F and 50 lbf/in.2 undergo two processes in series:

Process 1-2: Isothermal to p2 5 10 lbf/in.2

Process 2-3: Constant pressure to T3 5 210°F Employing the ideal gas model

(a) represent each process on a p-y diagram and indicate the dead state.

(b) determine the change in exergy for each process, in Btu.

Let T0 5 77°F, p0 5 14.7 lbf/in.2 and ignore the effects of motion and gravity.

2. Twenty pounds of air initially at 1560°R, 3 atm fills a rigid tank. The air is cooled to 1040°R, 2 atm. For the air modeled as an ideal gas

(a) indicate the initial state, final state, and dead state on a T-y diagram.

(b) determine the heat transfer, in Btu.

(c) determine the change in exergy, in Btu, and interpret the sign using the T-y diagram of part (a).

Let T0 5 520°R, p0 5 1 atm and ignore the effects of motion and gravity.

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Mechanical Engineering: 1 two pounds of air initially at 200degf and 50 lbfin2
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