To keep air fresh in a factory, recirculated air is mixed with external air. The air from the factory has a volumetric flow rate of 3 m3/s, a temperature of 32°C, and a relative humidity of 60%. The outside air has a volumetric flow rate of 1 m3/s, a temperature of 20°C, and a relative humidity of 60%. (a) Determine the temperature and relative humidity of the mixed stream. (b) It is desired to return the air to the factory at 15°C and a relative humidity of 40%. To do this, the mixed stream is sent through a cooling and dehumidifying system. Determine the heat transfer rates for the cooling coil section and the heating element section for this system.
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