Best Formula to calculate Fresh Air cooling load?
In an office building at Kolkata my total fresh air demand is 6000cubic feet per minute. What is the formula to calculate the Tonnage of Refrigeration for that 6000cfm outdoor air at DB 99.68 degree Fahrenheit and WB 83.12 Fahrenheit.
1] Get a psychrometric chart – http://en.wikipedia.org/wiki/Psychrometric_chart#Psychrometric_charts
2] Locate initial and final conditions and read from the chart the enthalpies [T, humidity]
3] calculate DeltaH on a per kg basis
4] Calculate DeltaH/unit time for the flow
Now there is one twist; the air exiting the cooling coils will be at 100% RH, which can be uncomfortable. In the old days, when energy was cheap, a reheat coil was added, using steam to heat the cooled air up a little to reduce the RH. I am not sure what is done about this nowadays.
Also, my experience on air handlers is that later on someone always wants more airflow. My advice is to oversize the air handler a little, maybe 20%, and just put a smaller pulley on the fan. Later on, when they want more airflow, it is just a question of changing pulleys and belts, not adding another air handler.
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