Question

An air handling unit combines return air at 75o F and 60% relative humidity with outside...

An air handling unit combines return air at 75o F and 60% relative humidity with outside air at 50o F and 30% relative humidity. The mixed air temperature is 60 o F and the volume flow rate of the mixed air is 1700 CFM. Find the volume flow rate of the outside air and the relative humidity of the mixed air. The building is located at 5000 foot elevation.

Answer:

RHmix = 55% and V_dot_mix = 951 CFM

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