Figure P16.61 is the schematic diagram for an air distribution system at sea level that is to be analyzed by the equal-friction method [Δp/L = 0.15 inWG/100 ft (1.2 Pa/m)]. The ductwork is round; and smooth-radius, round, r/D = 1 elbows are used. What pressure rise must the fan develop to deliver air in this system to air outlet 5 if the duct outlets have a pressure drop equivalent to 25 ft (8 m) of straight duct? The diverging tees at B, C, D, and E are round, conical branch designs; all size transitions are 15° converging designs, and the balancing damper downstream of tee E is a wide-open butterfly type.

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4000 cfm D 25 ft 100 ft B 100 ft 'A C 50 ft Fan 80 ft 75 ft 5 ft E '2000 cfm 20 ft F '3000 cfm 4000 cfm D 25 ft 100 ft B 100 ft 'A C 50 ft Fan 80 ft 75 ft 5 ft E '2000 cfm 20 ft F '3000 cfm

Answer rating: 100% (QA)

Pressure loss 015 inWG 100 ft For straight duct ABCD length 1001005025 275 ft So Pressure l... View the full answer