Example_14.1 - Example 14.1 Operating point of a Fan in a...

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Example 14.1 Operating point of a Fan in a Ventilation System Properties of air at 25 ºC kinematic viscosity ν = 1.56E-05 = 0.000168 density ρ = 1.184 = 0.002297 atm. pressure p = 101325 Pa = 2116.274 Design flow rate line 600 0 2 600 cfm = 600 1 1.05 Pipe diameter = 9.06 in = 0.755 ft Pipe length = 44 ft Roughness height = 0.15 mm = 0.000492 ft Roughness factor e/D = 0.000652 Centrif. fan inlet d = 9 in 0.21 Centrif. fan inlet d = 9 in Number of elbows N = 5 Area of pipe = 0.447697 Entry loss coef ELF = 1.3 Min flow rate Q = 600 cfm Damper loss coef DLF = 1.8 g = 32.2 4.15 Q (flow rate velocity Re f ft/s ft ft water in water 0 0.0 0 0.0000 4.15 0.00 0.00 0.00 25 0.9 4179 0.0404 4.15 0.10 0.00 0.00 50 1.9 8358 0.0332 4.15 0.38 0.00 0.01 75 2.8 12538 0.0300 4.15 0.84 0.00 0.01 100 3.7 16717 0.0280 4.15 1.47 0.00 0.02 125 4.7 20896 0.0267 4.15 2.27 0.00 0.03 150 5.6 25075 0.0257 4.15 3.24 0.00 0.05 175 6.5 29255 0.0249 4.15 4.39 0.01 0.06 200 7.4 33434 0.0243 4.15 5.70 0.01 0.08 225 8.4 37613
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