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A room in the summer is to be maintained at 20°C, 50% RH when the outside...

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Mechanical Engineering

A room in the summer is to be maintained at 20°C, 50% RH whenthe outside conditions are 35°C, 80% saturation. The sensible andlatent heat gains are 5.5 kW and 1.4 kW respectively. Theconditioned air is supplied through ducks from a central stationconsisting of a cooler battery, a reheat battery, and a fan. Freshair is supplied to a mixing unit where it mixes with a certainpercentage of air recirculated from the room, the remainder of theroom air being expelled to atmosphere. The air entering the room isat 13°C, the air temperature rise in the fan and duck work is 1°C,the air leaving the cooler battery and entering the reheat batteryis at 8°C, and the apparatus dew point of the cooler is 2°C.Calculate (a) the cooler battery load in kW, (b) the reheaterbattery load in kW, (c) the cooler battery bypass factor.

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