Properties of Humid Air, Using Thermo Utilities, MS Excel Add-ins

Determine the vapor pressure, moisture content, percentage saturation, relative humidity, specific enthalpy, specific heat capacity, specific entropy and density for air with the following conditions:

Dry-bulb temperature = 22 C

Wet-bulb temperature (sling) = 14 C

Atmospheric pressure = 1.013 bar

 
Inputs

Units

Dry-bulb temperature

22,0

C

Wet-bulb temperature

14,0

C

Atmospheric pressure

1,013

bar

Outputs

Moisture content

0,0066

.

Percentage saturation

0,3982

.

Relative humidity

0,4003

.

Gas Constant

0,2882

kJ/(kg.K)

Specific heat capacity

1,0102

kJ/(kg.K)

Specific enthalpy

38,7042

kJ/kg

Specific entropy

0,0782

kJ/(kg.K)

Density

0,0168

kg/m3

Molecular mass

28,8525

kg/kmol

Vapor pressure =Patm*mc/(mc+0.622)

0,0106

bar

 


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