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A space is to be maintained at 26°C DB and 50% RH at a location where...

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Mechanical Engineering

A space is to be maintained at 26°C DB and 50% RH at alocation where the summer design conditions are 35°C DB and 27°CWB. In the system, 30% fresh air is used for the comfort ofoccupants. The cooling coil in the AHU has an apparatus dew pointtemperature of 9.5°C, and a by-pass factor of 0.25. The fan,supplying 36,000 m3/h air, in the AHU has a motor with anelectricity consumption rate of 32 kW. Assuming 90% of this energyis converted to heat energy in the AHU;
(a) Show the process on the psychrometric chart on thefollowing page,
(b) Calculate the ∆T of air through the fan (°C),
(c) Determine the temperature of supply air leaving the coil(°C),
(d) Find the room cooling load in kW, using correspondingenthalpy and specific volume values.

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