=+3-41.

A cooling system is being designed for use at high elevation (5000 ft or 1500 m) where the outdoor air is very dry. The space with a high latent load, SHF = 0.7, is to be maintained at 75 F (24 C) db and 40 percent relative humidity. Outdoor air at 100 F (38 C) and 10 percent relative humidity is to be mixed with return air in a way that it can be cooled sensibly to 50 F

(10 C), where it crosses the condition line, The air is then supplied to the space, Sketch the processes on Chart IHa or 1Hb and compute the volume flow rate of the supply air and the percent outdoor air per ton of cooling load, in

(a) English units and

(b) SI units.