What would the mixed air temperature be for a system with 30 percent outdoor air if the outdoor temperature is 20°F and the return air temperature is 70°F?
A) (20°F + 70°F)/2 =45°F mixed air temperature
B) 0.3 × 20°F = 6°F; 0.7 × 70°F = 49°F; 6°F + 49°F = 55°F mixed air temperature
C) 0.3 × 20°F = 6°F; 6°F + 70°F = 76°F mixed air temperature
D) Mixed air temperature cannot be calculated with the information given.
B
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