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REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - mixed air temperature
PROBLEM:
An air-conditioning system draws 10% outdoor air at a dry bulb temperature of 42 C / 108 F. If the return air is at 28 C / 82 F, determine the dry bulb temperature of the mixed air.
Given
10% outdoor air
42C/108F outdoor air temperature
28C/82F return air temperature
Unknown
dry bulb temperature of mixed air
SOLUTION:
(% Outdoor Air x Temperature) +
(% Indoor Return Air x Temperature) = 100% x Air Mixture Temperature
using Celcius temperatures and substituting given values, we have
( 10% x 42 ) +
( 90% x 28 ) = 100% x Air Mixture Temp
Mixed air temp
= 4.2 + 25.2
= 29.4 C / 85 F
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