Question

Assuming standard atmospheric pressure and tdb=25 C and 90% RH. Compute (a) dew point temperature (b) specific humidity (c) enthalpy (d) wet bulb temperature

Answer 1

We can solve this problem easily using psychrometric chart at atmosphere as given in the question:

In first figure:yellow line is directed by dry bulb temperatureTdb=25⁰ c as relative humidity is 90% plot the point indicated as red point.

*from that red point go along sky blue line you get specific humidity=18g/kg.

*from that red point go along brown line you get enthalphy=70.5kj/kg

as it doent have temperatures on the curve i used another chart 2

White line directs dry bulb temperature and plot the point corresponding to Tdb and 90% relative humidity as before.

.*from that point go along red line you get dew point temperature=>T_dw=23.5⁰c

.*from that point go along purple line you get wet bulb temperature=>Twb=24⁰c