A local ventilation system (hood and exhaust duct) is used to remove air (p=1,184 kg/m and =1,84910- 5 kg/(ms) for 25 C and 1 atm=101 325 Pa) and contaminants produced by a dry-cleaning operation. The inner diameter of the duct is D=0.46 m, and its total length is L=24.4 m. There are five elbows along the duct. The equivalent roughness height of this duct is &-0.15 mm, and each elbow has a minor (local) loss coefficient of K. -0.21. Literature from the hood manufacturer lists the hood entry loss coefficient as Khe=1.8 based on duct velocity. When the damper is fully open, its loss coefficient is Ka-1.8. A centrifugal fan with 460 mm inlet and outlet diameters for 1500 rpm is available. Its performance data are shown in Table, as listed by the manufacturer. R= 287 kJ/(kg K). Q(m/h) Ap (mmSS) n (%) 0.00 0 38 70 58 25 4 424.75 849.50 1274.25 1899.00 2278.80 22.86 24.13 22.86 19.05 10.16 4.02 Hood Fan Damper Q1) Draw a plot of the system curve and the pump performance curve as functions of volume flow rate. (25 P.) Q2) Predict the volume flow rate at the operating point of this local ventilation system? (25 P.) Q3) Find out the efficiency at the operating point of this local ventilation system? (25 P.) Q4) Find out the operating power of this local ventilation system? (25 P.)