Water enters a hydraulic turbine through a 30-cm-diameter pipe at a rate of 1.1 m /s and exits through a 25-cm-diameter pipe. Thepressure drop in the turbine is measured by a mercury manometer to be 1.2 m. For a combined turbine-generator efficiency of 83percent, determine the net electric power output. Disregard the effect of the kinetic energy correction factors. Take the density ofwater to be 1000 kg/m3 and the density of mercury to be 13,560 kg/m3.30 cmTurbineGenerator25 cmAP = 1.2 m HgThe net electric power output iskW.

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Answered: Water enters a hydraulic turbine…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A site is being considered for wind power generation. At this site, the wind blows steadily at 9 m/s for 2,579 hours per year. Assuming the wind velocity is negligible at other times for simplicity, determine the kWh/year that can be produced at the site for a turbine with a mechanical efficiency of 100% and an effective flow area of 5 m2. Use a value of 1.25 kg/m3 for the density of the air. Give your answer in killowatt-hours per year (kWh/year). Hint: I reccomend starting by finding the kinetic energy (kJ/kg) of the wind. Hint 2: Multiply the power generation (kW) by the number of hours of wind per year (h/year) to get kWh/year.
A river flowing steadily at a rate of 125 m3/s is considered for hydroelectric power generation. It is determined that a dam can be built to collect water and release it from an elevation difference of 70 m to generate power. Determine how much power can be generated from this river water after the dam is filled.
In a hydroelectric power plant, water flows from an elevation of 400 ft to a turbine, where electric power is generated. For an overall turbine-generator efficiency of 82 percent, determine the flow rate of water to generate 100 kW of electricity if the irreversible head loss of the piping system between the free surfaces of the inlet and the outlet is 36 ft. Take the density of water to be p = 62.4 lbm/ft³. ft³/s. The flow rate of water is 0.151
Electric power is to be generated by installing a hydraulic turbine—generator at a site 120 m below the free surface of a large water reservoir that can supply water steadily at a rate of 930 kg/s. If the mechanical power output of the turbine is 850 kW and the electric power generation is 770 kW, determine the turbine efficiency and the combined turbine— generator efficiency of this plant. Neglect losses in the pipes.
An oil-transfer pump uses 1 kW of power in transferring 5 kg/s of oil through a 3-cm-diameter pipe. The changes in kinetic and potential energies are essentially zero, and the process is adiabatic. Additionally, there is no appreciable temperature change in the oil, which has a density of 1500 kg/m³. Determine the change in pressure from inlet to exit.
A pump increases the water presssure from 8kPa at the inlet to 700 kPa at the outlet. Water enters this pump at 41.51 degrees celsius through a 1.145-cm-diameter opening and exits through a 2.821-cm-diameter opening. Determine the velocity of the water at the outlet in m/s when the mass flow rate through the pump is 1.354kg/s. The specific volume of incoming water is 1.547x10-3m3/kg.
A pump rated at 1800 W is used to transfer water from an open tank to another open tank. The surfaces of the two tanks are kept 20 m apart, vertically, while the mass flow of the water is 5 kg/s. Determine the efficiency of the pump
A fan is to be selected to ventilate a bathroom whose dimensions are 2 m × 3 m × 3 m. The air velocity is not to exceed 7 m/s to minimize vibration and noise. The combined efficiency of the fan–motor unit to be used can be taken to be 50 percent. If the fan is to replace the entire volume of air in 15 min, determine (a) the wattage of the fan–motor unit to be purchased, (b) the diameter of the fan casing, and (c) the pressure difference across the fan. Take the air density to be 1.25 kg/m3 and disregard the effect of the kinetic energy correction factors.

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