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Heat gain to an airstream?

Heat gain to an airstream?

Heat gain to an airstream?

(OP)
Hi all, does anybody know how one would go about calculating the heat gain to an airstream due to the motor and fan being in the airstream? i am told that in many cases it could be quite significant, is this true? any help in this regard would be much appreciated....

RE: Heat gain to an airstream?

Check ASHRAE Handbook of Fundamentals, calculating heat load, internal gains.  Essentially, for a motor in the airstream, it amounts to the full KW draw of the motor x use factor (how much is the motor running?).  For a motor running 1/2 the time, use factor = 0.5.  Usually amounts to 1.5 to 3 Deg temp rise.
 

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