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Unformatted text preview: o C. Humid air enters the heating section at 10 o C and 70% relative humidity with a volumetric flow rate of 70 m 3 /min and it leaves the humidifying section at 20 o C and 60% relative humidity. Determine (a) the temperature and relative humidity of air when it leaves the heating section (b) the rate of heat transfer in the heating section, and (c) the rate at which water vapor is added to the air in the humidifying section. 3. A tank contains 21 kg of dry air and 0.3 kg of water vapor at 30 o C and under a total pressure of 100 kPa. Determine (a) the specific humidity (b) the relative humidity and (c) the volume of the tank. 4. After a long walk in the 8 o C outdoors, a person wearing glasses enters a room at 25 o C and 40% relative humidity. Please perform a calculation to determine whether the glasses will become fogged. Explain your result....
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- Spring '11