Question

total flow and duct pressure required.

QUESTION #47: Refer to the following diagram. The pressure drop along each branch (in. wg.) of ductwork and the required air flow (cfm) for each room is listed in the diagram below. Assume all ductwork is of the same dimensions. The minimum required airflow and pressure requirement of the following air handling unit is most nearly? 0.1 0.2 500 CFM 1500 CFM 500 CFM AHU A. 2500, 0.2 B. 2500, 0.4 C. 500, 0.1 D. 1500, 0.2

Answer 1

Minimum required airflow = sum of airflows along each branch

Required CFM = 500 CFM + 1500 CFM + 500 CFM

Required CFM = 2500 CF

Minimum pressure requirement = sum of pressure losses along each branch

Pressure requirement = 0.1 + 0.1 + 0.2

Pressure requirement = 0.4

Hence, the answer is B.