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Unformatted text preview: Problems are from Chapter 14, 5 th Edition of the textbook. Note: Homework due on Thursday, July 24, 2008. Chapter 14, Problem 44E. A room contains air at 1 atm, 82F, and 70 percent relative humidity. Using the psychrometric chart, determine ( a ) the specific humidity, ( b ) the enthalpy (in Btu/lbm dry air), ( c ) the wet-bulb temperature, ( d ) the dew-point temperature, and ( e ) the specific volume of the air (in ft 3 /lbm dry air). Chapter 14, Problem 69E. A heating section consists of a 15-in.-diameter duct that houses a 4-kW electric resistance heater. Air enters the heating section at 14.7 psia, 50F, and 40 percent relative humidity at a velocity of 25 ft/s. Determine (a) the exit temperature, (b) the exit relative humidity of the air, and (c) the exit velocity. Chapter 14, Problem 79. An air-conditioning system is to take in air at 1 atm, 34C, and 70 percent relative humidity and deliver it at 22C and 50 percent relative humidity. The air flows first over the cooling coils, deliver it at 22C and 50 percent relative humidity....
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- Summer '08