Question

A ducting system has to distribute 63 CMM of dehumidified air to the rooms (R1, R2, R3, R4 and R5) of a building as shown in the picture. The flow quantities of each diffuser are given in the table.

The total pressure available is 5.2mm of water and the pressure loss at each uotlet diffuser is assumed to be equal to 1 mm of water. The lengths of each duct segment are shown in the picture. The equivalent straight length of the:

Entrance to air handler = 3m
For each of the elbow = 86 m
For each straight through section at Tee = 4 m
For each branch at Tee = 10 m

Duct velocities should be about 4.5 cm/s or less.

Determine the diameter of each section of the longest run of ducting system using the equal FRICTION-DROP method.

Please show any charts or any other materials used and do it step by step please.

R4 R1 R2 Outlet diffuser Air low Rate (CMM 18 1 75 55 Table Qu. 10: Air Flow Rates for Question 10 A R1 HANDLER 255R3 1 | 3.5 | 16.5] R2 47 R1 5.5 5.5 | R415.5 R5

Answer 1

Given that The flow rate of the Air Handler trap out the duet system = 63 CMM = 63 times 35.31 CFM = 2225 CFM and also given friction loss for each difference = 1 mm of water = 0.039 inch/wc velocity of air in duct = 4.5 cm/s = 8.85 FPM \r\n Note: - Width of the Duct in Inches Height of the Duct in Inches} which in \r\n
DUCT SIZER SOFTWARE IS AS SHOWN