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TRG-TRC001-EN 19
period two
Air Mixtures
notes
If outdoor air B is mixed with recirculated air A, the conditions of the resulting
mixture are found somewhere on a straight line connecting the two points.
If the mixture is half and half, this condition falls on the midpoint of the line
between A and B. If more than half of the mixture is recirculated air A, the
condition of the mixture will fall closer to A than to B.
In this example, 1,000 cfm of outdoor air (OA) is mixed with 3,000 cfm of
recirculated air (RA) for a total supply airflow of 4,000 cfm.
First, the percentage of outdoor air within the mixture is determined. This is
done by dividing the outdoor air quantity by the total air quantity.
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Figure 33
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Figure 34
1,000 cfm
4,000 cfm
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