MIT4_42JF10_assn05 (1)

# MIT4_42JF10_assn05 (1) - 4.42 F10 Assignment#5 FOR ALL OF...

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4.42 F’10 Assignment #5 Page 1 of 2 FOR ALL OF THE FOLLOWING PROBLEMS USE THE PSYCHOMETRIC CHARTS WHEN YOU CAN TO OBTAIN THE NEEDED DATA. 1. The air leaving an office space is at 78 o F dry bulb and 85% relative humidity. The leaving air is cooled to 65 o F dry bulb and 70% relative humidity and returned to the office space. This is accomplished by first sensible cooling of the air to saturation, then cooling and dehumidification along the saturation line and finally reheating without vapor addition. Show the process on the psychometric curve. Find the energy requirement for each of the three processes per pound of dry air. 2. The overall change of state described in problem 1 is to be accomplished solely by mixing the leaving air with cool air at 55 o F. What must the relative humidity of the cool air be so that the mixture can reach the 65 o F dry bulb and 70% relative humidity state? How many pounds of cool air are needed per pound of leaving air? 3.

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MIT4_42JF10_assn05 (1) - 4.42 F10 Assignment#5 FOR ALL OF...

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