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Split_00051 - Vroom = 141 ft 3 DA = dry air 8.70 mDA = ha =...

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8-51 8.70 V m h room 3 DA 3 o 3 m o m a m 2 m m 2 m ft . DA = dry air. = ft lb - mol R 0.7302 ft atm lb DA lb - mol atm 550 R lb DA lb H O lb DA lb H O / lb DA = = = = 141 140 29 1 101 0 205 101 0 0203 . . . . From the psychrometric chart, F, h T F V ft / lb DA T F H Btu / lb db o a r wb o 3 m dew point o m T h = = = = = = = 90 0 0903 67% 805 14 3 77 3 44 0 011 439 . . ± . . ± . . . 8.71 T T h r db ab C C He wins = ° = ° = 35 27 55% 8.72 a. T T h h T r a wb db dew point Fig. 8.4-1 2 C, C kg H O kg dry air C = ° = ° = = = ° 40 20 33%, 0 0148 255 . . b. Mass of dry air: m da = = × 2.00 L 1 m 1 kg dry air 10 L 0.92 m kg dry air 3 3 3 2 2 10 3 . from Fig. 8.4-1 Mass of water: 2.2 10 kg dry air 0.0148 kg H O 10 g 1 kg dry air 1 kg g H O 2 3 2 × = 3 0 033 . c. ± . . . H 40 78 0 0 65 77 4 ° = C, 33% relative humidity kJ kg dry air kJ kg dry air b g b g ± . H 20 57 5 ° C, saturated
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