Considering Air-Conditioning ApplicationsFigure P12.98

Chapter 12, Problem 98P

(choose chapter or problem)

Figure P12.98 shows two options for conditioning atmospheric air at steady state. In each case, air enters at \(15^{\circ} \mathrm{C}\), 1 atm, and 20% relative humidity with a volumetric flow rate of \(150 \mathrm{m}^{3} / \mathrm{min}\) and exits at \(30^{\circ} \mathrm{C}\), 1 atm, and 40% relative humidity. One method conditions the air by injecting saturated water vapor at 1 atm. The other method allows the entering air to pass through a soaked pad replenished by liquid water entering at \(20^{\circ} \mathrm{C}\). The moist air stream is then heated by an electric resistor. For \(T_{0}=288 \mathrm{K}\) which of the two options is preferable from the standpoint of having less exergy destruction? Discuss.

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