Determine the adiabatic saturation temperature of air at the following conditions:
Drybulb temperature 22 C
Wetbulb temperature (sling) 14 C
Atmospheric pressure 1.013 bar
An adiabatic process is defined as a process in which no external heat enters or leaves the system under consideration. Adiabatic humidification process: Air is flowing through a perfectly insulated duct with an open water tank in the bottom of it. If the tank is infinitely long, the air at the outlet will be 100% saturated.
Inlet: drybulb temperature T1 and moisture content g1
Outlet: drybulb temperature T2 and moisture content g2
We may write:
h1 = h2
or Sensible heat loss = Latent heat gain i.e.
Cp * ( T1  T2 ) = Hfg * ( g2  g1 )
Inputs 
Units 

Drybulb temperature = T1 = Td 
22,0 
C 

Wetbulb temperature 
14,0 
C 

Atmospheric pressure 
1,013 
C 

Outputs 

Moisture content = g1 = InletMC 
0,0066 
kg/kg 

Spec. heat capacity at inlet = Cp 
1,0102 
kJ/(kg.K) 

Spec. enthalpy at inlet = InletH 
38,7042 
kJ/kg 

Assume that adiabatic saturation  .  .  
temperature Tsat, is 30 degC 
13,7920 
C 
Assumed 
Saturated air has the same temp.  .  .  
for dry and wet bulb which results  .  .  
into the following  .  .  
moisture content at outlet=OutletMC 
0,0098 
kg/kg 

Now the enthalpy at outlet can be  .  .  
calculated. OutletH is: 
38,7043 
kJ/kg 

We know that in an adiabatic  .  .  
process diff = OutletH  InletH = 0 
0,0001 
. 
Goal 
Now, use the solver to adjust cell  .  .  
Tsat, until the goal cell  .  .  
diff is zero.  .  .  
Adiabatic Saturation Temp. =Tsat 
13,8 
C 