Figure P16.61 is the schematic diagram for an air

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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