Evaluating ExergyTwenty pounds of air initially at 1560°R,
Chapter 7, Problem 25P(choose chapter or problem)
Twenty pounds of air initially at \(1560^{\circ} \mathrm{R}\), 3 atm fills a rigid tank. The air is cooled to \(1040^{\circ} \mathrm{R}\), 2 atm. For the air modeled as an ideal gas
(a) indicate the initial state, final state, and dead state on a T-v diagram.
(b) determine the heat transfer, in Btu.
(c) determine the change in exergy, in Btu, and interpret the sign using the T-v diagram of part (a).
Let \(T_0\) = \(520^{\circ} \mathrm{R}\), \(p_0\) = 1 atm and ignore the effects of motion and gravity.
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