ME 323 AU 08 November 26, 2008 Problem Set 10 Due: 12/5/2008 1. Moist air enters a device operating at steady state at 100 kPa with a dry-bulb temperature of 55°C and a wet bulb temperature of 25°C. Liquid water at 20°C is sprayed into the air stream, bringing it to 40°C, 100 kPa at the exit. Determine: a. The relative humidity at the inlet and exit b. The amount of liquid water sprayed in , in kg per kg of dry air 2. An air conditioner operating at steady state takes in moist air at 28°C, 1 bar, and 70% relative humidity with a volumetric flow rate of 50 m 3 /min. The moist air first passes over a cooling coil and some water vapor is condensed. 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 24°C, 1 bar, and 40% relative humidity. Determine: a. The temperature of the moist air exiting the dehumidifier unit, in °C. b.
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