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Split_00053

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

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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 ° b g ] substance ± m in ² H in ± m out ² H out Air H O F 2 l , 49 ° b g 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 H O 2 in lb m /min, ² H H O 2 in Btu/lb m Q H = = = Δ 765 214 455 12 000 9 . . . , b g +1.2(17.0) (Btu) 60 min 1 ton cooling min 1 h Btu h .1 tons cooling b. 6 m 7 m 2 m o m (76.5 lb
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