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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 *p*2 5 10 lbf/in.2

**Process**** ****2-3: **Constant pressure to *T*3 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 *T*0 5 77°F, *p*0 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 *T*0 5 520°R, *p*0 5 1 atm and ignore the effects of motion and gravity.

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