0.15 m b M3 M3 M₂ ДНЕ DB 0.08 m M₁ 0.15 m M₂ HE B 0.08 m M₁ C Figure Q2. Bath shower mixer unit with water entering the system at point A and exiting through (a) spout located at point B and (b) shower head located at point C. Table 1. Loss coefficients for pipe fittings Loss coefficients for KL Gate valve-fully opened 0.19 90° elbow 0.9 Tee along the main channel 0.4 Tee along branch 1.8 Part B: Water at 40 °C (p = 992.3; kg and v = 0.664 × 10-6 m²/s) flows through a pipe at point A (Figure Q2) with a diameter of 20 mm and a friction factor of f = 0.004. The water flows into a bath shower mixer unit at D, made from a tee junction. From here, water can exit along the tee branch through the spout via a gate valve (Figure Q2a) or along the main channel of the tee and through the showerhead (Figure Q2b). The water pressure at point A has been measured at 100 kPa. Loss coefficients for pipe fittings have been provided in Table 1. (a) If the water exits through the spout (Figure Q2a) via a fully opened gate valve at B, with a diameter of 12 mm, determine the flow rate out of the spout in L/s. The minor loss coefficient for the spout at B is Kspout = 0.6. Account for the minor loss in the elbow, the tee, and the gate valve. The gate valve at E is closed. (b) If the water emerges through the showerhead (Figure Q2b, point C) that consists of 100 identical holes, each with a diameter of 1.5 mm. Determine the flow rate out of the showerhead in L/s. The minor loss coefficient of the showerhead is Kshowerhead = 0.45. The gate valve at B is closed. Account for the minor loss in the three elbows, the fully opened gate valve at E, and the tee. (c) Discuss the differences in flow rate when water exits through the spout at point B versus exiting through the showerhead at point C. Justify your answer.

Inner and outer diameters of an outward flow reaction turbine wheel are 1m and 2m respectively. The water enters the vane at angle of 20° and leaves the vane radially. Assuming the velocity of flow remains constant at 12m/s and wheel rotates at 290rpm, find the vane angles at inlet and outlet.   Show schematic diagram and provide solutions.

3. A centrifugal pump is to be placed above a large, open water tank, as shown in the figure below. Water is pumped at a rate of I cu ft/s. At this flow rate the required net positive suction head, NPSHR, is 15 ft as specified by the pump manufacturer. The water temperature is 80°F and atmospheric pressure is 14.7 psi. Assume that the major head loss between the tank and the pump inlet is due to filter at the pipe inlet having a minor loss coefficient KL.-20. Other losses can be neglected. The pipe on the suction side of the pump has a diameter of 5 in. The water vapor pressure at 80°F is 0.5069 psia and y-62.22 lb/cu.ft. Determine Z1 for cavitation not to occur.. P1-Patm (1) (2) Reference plane

Q1/ liquid is pumped from a ground level reservoir to an overhead tank through a 5 cm ID pipe as shown in Fig. (1): i. What pressure developed by the pump to 45° elbow 8 m Fig. (1) Globe valve Tank 5 m supply water to the tank at the rate of 245 I/min? ii. What is the power required for the pump, if the pump is only 62% efficient? iii. Calculate the available NPSH. If the pump required 12 m NPSH is it suitable to prevent cavitation for this system? why? Given that: u = 0.0016 Pa.s; p 850 kg/m', e/d 0.0035, (Le/d) of Globe valve (open) = 240 (Le/d) of 45° ēlbow = 24 and Pv = 36.6 kPa 25 m 45° Reservoir 45° elbow

B2

Q3: Size the duct system shown in the figure. The air velocity at the inlet is 8m/s. The length of each duct segment is 4m. If the pressure drop in each diffuser and elbow (or Tee branch) is 20Pa and 25 Pa respectively, calculate pressure head required for the AHU. (Note: CFM=ft³/min.) the AHU 600CFM 800CFM 1000CFM 600CFM 800CFM 1000CFM 600CFM 800CFM 1000CFM

In Figure below, the pipe entrance is sharp-edged having K1 = 0.5, and for the open globe valve assume K2 = 6.0. The flow rate of water is 0.015 m'/s. 3 (a) Calculate the velocity and Reynolds number of flow. (b) Find the head loss due to friction, hf (in m). (c) Calculate the Turbine head (in m) and Power generated (in Watt). Given: Density of water, pwater = 1000 kg/m²; Viscosity of water, u = 0.001 kg/m.s; Friction factor from Moody Chart, f=0.024. Draw sketch and show all calculations. 1 Open globe valve Turbine 60 m Water Steel pipe: L= 140 m, D = 7.5 cm

Item#3 The oil tank for the hydraulic system of figure below is air-pressurized at 10psig. The inlet line to the pump is 10 ft below the oil level while point 3 is 2ft below pump inlet. The pump flow-rate is 30 gpm and has a power equal to0.5HP. Find the pressure at station 3if there is a 28ft head loss between station 1 and 3. OIL LEVEL SG 0.9 1.5-IN- INSIDE DIAMETER 10 FT STRAINER ELECTRIC MOTOR M 2 FT PUMP 3 Q-30 GPM

3.

(b) Figure 3 shows a pump with 80% efficiency (no) delivers 50 Liter/s of water at 20°C from tank 1 to tank 2. The pipeline has 150 mm diameter with a length of 200 m made of galvanised steel. Evaluate the input power to an electric motor of 90% (nm) efficiency that connected to the pump. The globe valve used is % wide open. 2 100 m GLOBE VALVE PRESSURE GAUGE МОTOR PUMP