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AIR MIX SELECTION

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stern

Electrical
Joined
May 5, 2011
Messages
28
Location
MX
Hello everyone,

I have the following problem, outside air x conditions and its required 90% return air and 10% outside air to heat a building.

Is there a rule of thumb on what conditions to consider for indoor air( return) to calculate the mix?

I need to determine the BTU/hr required and need a practical method to handle air mixes.

Thank you
 
Yes, there is a thumbrule, but the problem is we can't differentiate it from a standard procedure, because both are same.

Check thread403-299263 for the procedure and download Psychro07.zip from The fourth worksheet is about mixing calculations.
 
Thank you quark,

I see the calculator and its easy to use when you have both air stream conditions.

The problem is when you dont have the return air measurements, I suppose we have to assume these conditions but Im not sure.

Am I wrong?
 
You are right. Return conditions are conditions required in the control space (plus duct heat gain, which can be ignored for the sake of preliminary calculations).

 
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