Using Exergetic EfficienciesFigure P7.129 and the
Chapter 7, Problem 129P(choose chapter or problem)
Figure P7.129 and the accompanying table provide steady state operating data for a direct-contact heat exchanger fitted with a valve. Water is the substance. The mass flow rate of the exiting stream is \(20 \mathrm{lb} / \mathrm{s}\). Stray heat transfer and the effects of motion and gravity are negligible. For an overall control volume, (a) evaluate the rate of exergy destruction, in Btu/s, and (b) devise and evaluate an exergetic efficiency. Let \(T_0= 60^{\circ} \mathrm{F}, p_0=14.7 \mathrm{lbf} / \mathrm{in}^2\).
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