Q11 Design the duct system shown below using Equal friction method, and determine the fan power when the fan efficiency is 68%. The duct is circular. Take the velocity in the main duct AB equal to 7 m/s. Assume a dynamic loss coefficient of 0.5 in T fitting and 0.8 in elbow fitting. Given AB=BC= 10 m and BD = 25 m. C 1 m³/s (7 marks) A B 2 m³/s D

B- Calculate the power required for a water pump used in a closed system with flow rate Q=0.0076 m³/s. Assume that section area=0.00511 m² and at the area at the discharge is 0.0037 m². As AJ Water Suction Discharge pump Inlet gauge pressure=147 kPa Outlet gauge pressure=250 kPa

# 8-34. A 12 in diameter galvanized steel (smooth) straight duct section conveys air at 1000 ft /min. It is 100 ft long. a. Determine the pressure loss, in inches of w.c. b. Determine the average velocity of air flowing through the duct. c. Identify a cost-effective rectangular duct section with an equivalent pressure loss that has a side depth of 8 in.

Water at 40°F is flowing downward through the fabri- cated reducer shown in Fig. 7.11. At point A the velocity is 10 ft/s and the pressure is 60 psig. The energy loss be tween points A and B is 25 lb-ft/lb. Calculate the pressure at point B.

Q2\ Design the duct system shown below using the equal friction method, and determine the fan power when the fan efficiency is 68%. The duct is circular. Take the velocity in the main duct AB equal to 7 m/s. Assume a dynamic loss coefficient of 0.5 in T fitting and 0.8 (7 marks) in elbow fitting. Given AB=BC= 10 m and BD = 25 m. C A AB Bc B 1 m³/s 2 m³/s

The static head corresponding to a flow velocity of 10 m/S

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A branch duct for a heating system measures 76 mm * 154 mm. Compute the circular equivalent diameter. Then determine the maximum flow rate of air that the duct could carry while limiting the friction loss to 0.82 Pa/m

Q/ Design the rectangular duct system shown in figure below using equal friction method with frictional pressure drop of 1 pa/m. and allowable height is 300 mm assume the dynamic loss coefficient for elbow and exitas =1. 0.6 m /s 0.6 m/s 2m 2m 2m F 2m C2m|B E Fan A K 2mH G 5m 2m 2m I 2m 2m 4. 0.6 m/s 0.6 m /s

a pump operating at 1750 rpm delivering 600 gpm against total head of 200 tt. changes in the piping system have increase the total head of 450 tt. At what RPM should the pump be operated to achieve thus new head at the same efficiency?