Split_00053 - 8.74 (contd) The outside air is first cooled...

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8-53 8.74 (cont’d) The outside air is first cooled to a temperature at which the required amount of water is condensed, and the cold air is then reheated to 55 ° F. Since h a remains constant in the second step, the condition of the air following the cooling step must lie at the intersection of the h a = 0 0075 . line and the saturation curve = ° T 49 F References: Same as Fig. 8.4-2 [including H O F 2 l ,32 ° bg ] substance ± m in ² H in ± m out ² H out Air HO F 2 l ,49 ° 76.5 45.5 76.5 1.2 21.4 17.0 ± m air in lb m D.A./min ² H air in Btu/lb m D.A. ± m 2 in lb m /min, ² H 2 in Btu/lb m QH == = Δ 765 214 455 12 000 9 .. . , +1.2(17.0) (Btu) 60 min 1 ton cooling min 1 h Btu h .1 tons cooling b. 6 m 7 m2 m o m (76.5 lb DA/min)
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This note was uploaded on 01/07/2012 for the course CH E 210 at Pennsylvania State University, University Park.

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