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12-66 - 12-66 Equations Set 33 Problem 12-66 Using the...

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Unformatted text preview: 12-66 Equations Set 33: Problem 12-66 Using the psychrometric chart, determine a) the rh, humidity ratio, specific enthalpy corresponding to a dry-bulb of 30[C] and wetbulb of 25 [C] Tdb,a = 30 [C] Twb,a = 25 [C] rha = (AirH2O, T = Tdb,a , B = Twb,a , P = 101.3 [kPa]) a = (AirH2O, T = Tdb,a , B = Twb,a , P = 101.3 [kPa]) ha = h (AirH2O, T = Tdb,a , B = Twb,a , P = 101.3 [kPa]) b) The humidity ratio, enthaly, and wet-bulb corresponding to 30[C], 60% rh Tdb,b = 30 [C] rhb = 0.60 b = (AirH2O, T = Tdb,b , r = rhb , P = 101.3 [kPa]) h = h (AirH2O, T = Tdb,b , r = rhb , P = 101.3 [kPa]) Twb,b = wb (AirH2O, T = Tdb,b , r = rhb , P = 101.3 [kPa]) c) The dew point corresponding to a dry-bulb of 30 C and wet-bulb of 20 C. Tdp,c = DP (AirH2O, T = 30 [C] , B = 20 [C] , P = 101.3 [kPa]) For the plot T1 = Tdb,a T2 = Tdb,b T3 = T1 1 = a 2 = b 3 = (AirH2O, T = 30 [C] , B = 20 [C] , P = 101.3 [kPa]) (12) (13) (14) (15) (16) (17) (11) (6) (7) (8) (9) (10) (1) (2) (3) (4) (5) Solution h = 71.22 [kJ/kg] b = 0.01604 Tdb,a = 30 [C] Twb,a = 25 [C] ha = 76.11 [kJ/kg] rha = 0.6695 Tdb,b = 30 [C] Twb,b = 23.81 [C] a = 0.01796 rhb = 0.6 Tdp,c = 14.81 [C] Arrays Row 1 2 3 i 0.01796 0.01604 0.01052 Ti [C] 30 30 30 Psychrometric Plot ...
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12-66 - 12-66 Equations Set 33 Problem 12-66 Using the...

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