Question

65 в ееееееееееееее.pdf x + v Y FAQ BX 6 of 14 + O Fit to page IL Page view AV Read aloud Add notes OP A fan is to produce a constant air speed of 20 m/s throughout the 4 m diameter pipe loop shown below. The system is operated with the air at 30°C and 202.66 kPa absolute (Mw=28.97. u=1.846x10kg/m-s). The 4-m diameter pipes are smooth, and each of the four 90° bends has a loss coefficient of 0.3. Determine the power (kW) that the fan must provide to the air. Values for L2 and Li are 50 m and 25 m, respectively. L2 - L Fan Type here to search . a 10:17 AM 7/31/2020

Answer 1

sol Rez Due 4 X 20X p u f PM RT 202.668103 X0.0288 8.314 7 303 f = 2.317 kylm fuus, Rez 4x20x 2.317 1846X10-5 10 Moody chart I Re (Turbulent f = 0.005 From Moody thus total head loss in straight pipe = 2/4, +42) = 150m) Ap- & f. t het 2 . 4x0.005 X 150 * x 2.317 x 20 Top = 347.55 Pa 2 2

less due to. 90 bends- opz 4-X 2 (2 Kgu? {x{X23X2-11742 =_556:08 PM AP2 Total pressure loss = 347.55 + 556.08 Spe 903.63 Pa head required 903.68 2:317X9:81 th 39.75 m P gggh a 2.317 x 9.81 x x x 20 x 39.75 4 P = 226.96 kW) Any