Total pressure x 10, Pa 100 90 80 70 60 50 40 30 20 10 9 ∞ ||||| 7 400 300 200 Power, watts 800 2400 1600 X 1200 500 600

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Total Pressure X 10 Pa 100 90 80 70 60 50 40 30 20 10 9 7 400 300 200 Power Watts 800 2400 1600 X 1200 500 600 1 (588.05 KiB) Viewed 22 times

a) Please estimate the current duct pressure losses;
b) Please calculate the system effect factor;
c) Please sketch and put together the fan curve(s) and system
characteristics curve(s) to
show the actual operating point, design operating point, and system
effect factor;
(2) A forward-curved blade fan discharges air into a circular
duct (with cross-sectional area of 192 inch2) at flow rate of 4000
cfm. An elbow located 11.7 inch from the fan outlet turns up (i.e.
in position C in Textbook Figure 12-13). Estimate the system effect
factor for this outlet-duct elbow. Assume blast area ratio =
0.9.
Total pressure x 10, Pa 100 90 80 70 60 50 40 30 20 10 9 ∞ ||||| 7 400 300 200 Power, watts 800 2400 1600 X 1200 500 600 700 Efficiency, percent- 4800 800 3200 900 1000 Speed, rpm Wheel diameter 413 mm. Outlet area 0.19 m² 50 60 70 80 150 200 300 400 100 Capacity, m³/min (1) A forward - curved blade fan shown in the figure above has an actual operating point in a duct system at 900 rpm with a flow rate of 150 m³/min. The duct system was designed to circulate 170 m³/min.