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AIR MIX SELECTION

AIR MIX SELECTION

AIR MIX SELECTION

(OP)
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

RE: AIR MIX SELECTION

(OP)
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?

RE: AIR MIX SELECTION

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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