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MoistAirTab™ Example 3 - Heating

Example 3

Moist air, saturated at 2°C, enters a heating coil at a rate of 10 m3/s. Air leaves the coil at 40°C. Find the required rate of heat addition.

Solution

The solution is presented below as a table generated from Excel. The gray shaded areas represent the input data.

Soution:UnitsInletOutlet
Total pressurebar1.013251.01325
Dry bulb temperature°C240
Wet bulb temperature°C240.00
Volume flow ratem3/s10.0011.39
    
Humidity ratiokgw/kgdry air0.00440.0044
Volume of moist airm3/kgdry air0.78450.8932
Mass flowrate (dry air)kgdry air/s12.746312.7463
Enthalpy of moist airkJ/kgdry air12.9851.53
Total enthalpy flowkJ/s165.45656.86
    
Heat addedkW 491.42