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The design condition for a space is 77 F (25 C) db and 50 percent relative...

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Mechanical Engineering

The design condition for a space is 77 F (25 C) db and 50percent relative humidity with 55 F (13 C) db supply air at 90percent relative humidity A 50-ton, constant-volume space airconditioning system uses face and bypass and water temperaturecontrol. Outdoor air is supplied at 95 F (35 C) db, 60 percentrelative humidity with a ratio of 1 Ibm (kg) to 5 Ibm (kg) returnair. A part-load condition exists where the total space loaddecreases by 50 percent and the SHF increases to 90 percent. Theoutdoor air condition changes to 85 F (29 C) db and 70 percentrelative humidity. Assume sea-level pressure. (a) At whattemperature must the air be supplied to the space under thepart-load condition? (b) If the air leaving the coil has a dry bulbtemperature of 60 F (15 C), what in the ratio of the air bypassedto that flowing through the coil? (c) What is the apparatus dewpoint temperature for both the design and part-load conditions? (d)Show all the processes on a psychrometric chart.

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