4.8. In a power plant, the inlet water has a velocity of 100 ft/s and an elevation of 80 ft above the outlet of the plant. The outlet water has a velocity of 5 ft/s. How much work can be extracted by the power plant per unit- mass of water passing through the system? The enthalpy of the outlet water may be assumed identical with the enthalpy of the inlet water.

Question 2 A water pump driven by an 800 W electric motor is used to pump water from the ground level to a tank at the rate of 20000 L/hour. Water is being discharged into the tank at 10 meters above the ground; this is the maximum rise this pump can achieve. The water and the ambient temperatures are both 10 °C. The inlet and outlet pipe diameters for the pump are both 8 cm, respectively. Determine: (1)/ The average inlet linear flow velocity of the water; 2) Assuming the efficiency of the electric motor is 95%, calculate the efficieney-of the motor-pump unit; 3) The pressure difference between the inlet and the outlet of the pump.

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A water company wants to construct a pumping station, which delivers water from a river source to its large storage tank in the manufacturing plant, which will be used for its process cooling fluid. The proposed line consists of 180 ft on the suction side and 700 ft of the same size on the discharge line. a. Using a 3 in Sch. 40 pipe for the suction side and 4 in Sch. 40 pipe for the discharge side, determine the volumetric flow rate in gal/min that will be delivered to the storage tank.