Considering Air-Conditioning Applications
For the steam-spray humidifier in Problem 12.85, determine the exergy destruction rate, in Btu/min. Let T0 = 95°F.
12.85 Moist air at 95°F, 1 atm, and a relative humidity of 30% enters a steam-spray humidification device operating at steady state with a volumetric flow rate of 5700 ft3/min. Saturated water vapor at 230°F is sprayed into the moist air, which then exits the device at a relative humidity of 50%. Heat transfer between the device and its surroundings can be ignored, as can kinetic and potential energy effects. Determine
(a) the temperature of the exiting moist air stream, in °F.
(b) the rate at which steam is injected, in lb/min.
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