Considering Air-Conditioning ApplicationsFigure P12.82
Chapter 12, Problem 82P(choose chapter or problem)
Figure P12.82 shows a compressor followed by an aftercooler. Atmospheric air at 14.7 \(\mathrm{lbf} / \mathrm{in} .^{2}\), \(90^{\circ} \mathrm{F}\), and 75% relative humidity enters the compressor with a volumetric flow rate of 100 \(\mathrm{ft}^{3} / \mathrm{min}\). The compressor power input is 15 hp. The moist air exiting the compressor at 100 \(\mathrm{lbf} / \mathrm{in} .^{2}\), \(400^{\circ} \mathrm{F}\) flows through the aftercooler, where it is cooled at constant pressure, exiting saturated at \(100^{\circ} \mathrm{F}\). Condensate also exits the aftercooler at \(100^{\circ} \mathrm{F}\). For steady-state operation and negligible kinetic and potential energy effects, determine
(a) the rate of heat transfer from the compressor to its surroundings, in Btu/min.
(b) the mass flow rate of the condensate, in lb/min.
(c) the rate of heat transfer from the moist air to the refrigerant circulating in the cooling coil, in tons of refrigeration.
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