tutorial_10 - Indian Institute of Technology Kharagpur...

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1 Indian Institute of Technology Kharagpur Department of Mechanical Engineering Thermodynamics ME22002 Tutorial 10 (Reactive systems) 1. A tank contains 21 kg of dry air and 0.3 kg of water vapor at 30°C and 100 kPa total pressure. Determine (a) the specific humidity, (b) the relative humidity, and (c) the volume of the tank. Answer: (a) 0.0143 kgH 2 O/kg dry air, (b)52.9%, (c)18.7m 3 2. Air enters a heating section at 95 kPa, 12°C, and 30 percent relative humidity at a rate of 6 m 3 /min, and it leaves at 25°C. Determine (a) the rate of heat transfer in the heating section and (b) the relative humidity of the air at the exit. Answers: (a) 91.1 kJ/min, (b) 13.3 percent 3. Air at 1 atm, 15°C, and 60 percent relative humidity is first heated to 20°C in a heating section and then humidified by introducing water vapor. The air leaves the humidifying section at 25°C and 65 percent relative humidity. Determine (a) the amount of steam added to the air, and (b) the amount of heat transfer to the air in the heating section
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tutorial_10 - Indian Institute of Technology Kharagpur...

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