A space has a sensible cooling load of 10,800 BTU/h with a supply-air temperature of 55°F and a room design temperature of 75°F. What supply airflow is required?

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Multiple choice — select the best answer

A450 CFM
B500 CFM
C600 CFM
D675 CFM

✓ Correct answer: B. 500 CFM CFM = Q ÷ (1.08 × ΔT) = 10,800 ÷ (1.08 × 20) = 10,800 ÷ 21.6 = 500 CFM. The constant 1.08 = 0.075 lb/ft³ × 0.24 BTU/(lb·°F) × 60 min/hr, applicable at standard air density.

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Topic: Airflow & Ductwork

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A space has a sensible cooling load of 10,800 BTU/h with a supply-air temperature of 55°F and a room design temperature of 75°F. What supply airflow is required?

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