Homework SourseCombustion products 2 water vapor and 98 dry air by mass flo
Combustion products (2% water vapor and 98% dry air by mass) flow in a chimney at 34oC and 1 atm. Determine: a. The dew point temperature b. The humidity ratio c. The relative humidity
Solution
humidity ratio = 2/98 = 0.0204 Kg water vapor per kg dry air
= 0.622 x Pv/ (P - Pv)
0.0204 = 0.622 x Pv (1 - Pv)
Pv = 0.0317 atm = 0.0321 bar = pressure of water vapor
at 34 C, saturation pressure = Ps = 0.05320 bar
relative humidity = RH = Pv/ Ps = 0.0321 / 0.05320 = 0.6037 = 60.37 %
dew point temperature = saturation temperature at Pv i.e. at 0.0321 bar
DBT = 25.5 C
