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1. Moist air at 288C, 1 bar, and 50% relative humidity flows through a duct operating at steady state. The air is cooled at essentially constant pressure and exits at 208C. Determine the heat transfer rate, in kJ per kg of dry air flowing, and the relative humidity at the exit.
2. An air conditioner operating at steady state takes in moist air at 288C, 1 bar, and 70% relative humidity. The moist air first passes over a cooling coil in the dehumidifier unit and some water vapor is condensed. The rate of heat transfer between the moist air and the cooling coil is 11 tons. Saturated moist air and condensate streams exit the dehumidifier unit at the same temperature. The moist air then passes through a heating unit, exiting at 248C, 1 bar, and 40% relative humidity. Neglecting kinetic and potential energy effects, determine
(a) the temperature of the moist air exiting the dehumidifier unit, in 8C.
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