2,000 m3 /h of return air at 25 °C and 40% relative humidity are mixed with 500 m3 /h of outside air at 3 7 °C and 60% relative humidity before entering a cooling coil. The mixed air is then cooled sensibly to 1 7 °C. Sketch the process on the psychrometric chart and find the followings: a- Humidity ratio of mixed air before entering the cooling coil. b- Enthalpy of mixed air before entering the cooling coil. c- Relative humidity and d~w point temperature of the supply air.

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