Water is stored in an elevated reservoir. To generate power, water flows from this reservoir down through a large conduit to a turbine and then through a similar-sized conduit. At a point in the conduit 89.5 m above the turbine, the pressure is 172.4 kPa and at a level 5 m below the turbine, the pressure is 89.6 kPa The water flow rate is 0.800ms The output of the shaft the turbine is 658 kW. The water density is 1000 ke m. If the efficiency of the turbine in converting the mechanical energy gven up by the fluid to the turbine shaft is 89 % (n =0.89). a) Draw a schematic diagram for the process b) Calculate the frictional loss in the turbine in J kg %3D

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(b) Water is drained from a large reservoir using two horizontal pipes connected in series as shown in Figure Q3(b). The first pipe is 20 m long with 10 cm diameter, while the second pipe is 35 m long and has a 4 cm diameter. The water level in the reservoir is 18 m above the centerline of the pipe. Table Q3(b) shows the friction factor and loss coefficient for each pipe or fittings. Determine the velocity at the second pipe, discharge rate of water and the total head loss. Can you identify the material used in manufacturing the pipe? Water tank 18 m 20 m - 35 m →| Sharp edge entrance Figure Q3(b) Draining large reservoir using two horizontal pipes Table Q3(b) Condition Friction factor, f Pipe ø = 10 cm Pipe ø = 4 cm 0.0196 0.0162 Sharp edge entrance Sudden contraction Loss coefficient, K 0.50 0.46

A power station with an efficiency e generates W watts of electric power and dissipates D J of heat energy each second to the cooling water that flows through it. The cooling water increases its temperature by T degrees of Celsius. Find the mass of cooling water which flows through the plant each second. Specific heat capacity of water cw = 4,184 J/kgC e = 0.2W = 4.9 x 108 wattsD = 2.5 x 108 JT = 4 C Enter value in tons (1 ton = 1000 kg).Enter two digits after decimal point.