Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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The flow of a river is 150 cubic feet per second at a site where a 75 feet hydrostatic head canbe created by the erection of a dam. What is the potential capacity (in kW) of a hydroelectricpower plant if installed at this site? Consider that hydraulic efficiency of energy conversioncan be 80%, and that the electric efficiency can be 90%.
Water flows through a 7.5 m diameter penstock on a dam at a flow rate of 113 m3/s. The total head available for the turbine is 18.4 m. The specifiic weight of water is 9810 N/m3.
What is the power generated by the turbine?
At a proposed hydroelectric power plant site, the average elevation of headwater is 600m and the tailwater elevation is 480m. The average annual water flow is determined to be equal to that volume flowing through a rectangular channel 4m wide and 0.5m deep and average velocity of 5.5m/s. Assuming the plant will operate 350 days/year, find the energy kwh that the plant site can developed if the hydraulic turbine that will be used has an efficiency of 78% and generator efficiency of 90%. Consider a headwork loss of 4% of the available head.
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- A hydroelectric power station is supplied from a reservoir having an area of 50 km2and a head of 50 m.If overall efficiency of the plant is 60%, find the rate at which the water level will fall when the stationis generating 30,000 kWarrow_forwardDesign head at China’s Three Gorges Dam, the largest hydropower project in the world, is 80.6 m, and rated power output of each of the 32 turbine generator units is 700 MW. If the efficiency of each of the turbine generator units at full power output is 93.2%, what is the design flow through each turbine?arrow_forwardtakes in 30 m3/s of water from a Reservoir A at el. 100 m through its turbine and discharges it at v = 2 m/s at atmospheric pressure. The head loss in the turbine and penstock system is hf = 20 m. If the efficiency of the turbine is 90%, how much power will be generated by the turbine?arrow_forward
- A turbine is rated at 600hp when the flow of water through it is 82cu.m/sec. Assuming an efficiency of 92%, what is the head acting on the turbine?arrow_forward2.1 A hydro-electric power station has a reservoir area of 2.7 km² and a capacity of 4.6 x 106m³. The effective head of water is 100 metres. The penstock, turbine and generation efficiencies are 95%, 90%, and 85%, respectively. Instructions :round off to 2 decimal places 1. Determine the total electrical energy that can be generated from the power station (kWh). 2. Determine the depth of the reservoir (metres) 3.Determine the fall in reservoir volume level is the load of 100 kW is supplied for 5 hours (%).arrow_forwardWater from a reservoir is being supplied to a powerhouse that is located at an elevation 325 m below that of a reservoir surface. Discharging through a nozzle, the water has a jet velocity of 75 m/s and a jet diameter of 250 mm. a) Find the head lost between the reservoir and the jet in meters. b) Use the power formula to determine the power in the jet in kilowatts.arrow_forward
- The water behind a Dam is 206 m higher than the River below it. The water inthe dam is allowed to flow into the river to generate power.(i) Describe the energy conversions that take place at the hydro powergeneration plant.(ii) Apply the steady flow energy equation to determine the rate the water mustpass through the hydraulic turbines of this dam to produce 50 MW of power if theturbines are 100 percent efficient?arrow_forwardA pipe is used to deliver water at a rate of 3.8 m³/s from the intake to the turbine. The difference in elevation between the intake’s water surface and the turbine is 200 m. Knowing the headloss in the pipeline from the intake to the turbine is 8 m, find the power (in kW) generated by the turbine if its efficiency is 80%.arrow_forwardPls answer ASAP. A hydroelectric power plant takes in 1060 ft³/s of water through its turbine and discharges it to the atmosphere at 7 ft/s. The head loss in the penstock is 66 ft. Estimate the power extracted by the turbine in horsepower. Show fbd.arrow_forward
- a 150 mm diameter penstock supplies water to a turbine under a constant head of 30m. the power (kw) delivered by the the turbine if the system efficiency is 70%arrow_forwardThe flow rate of the hydroelectric power plant in the figure is 50 m3/s, and 2 meters of water column energy loss occurs due to friction in the pipeline. Find the power that water transfers to the turbine. Calculate the theoretical and actual power of the turbine by taking the efficiency of the turbine-generator group, η = 0.92. (Answer: Ntheoric=52 MW and Nreal=48 MW)arrow_forwardNeed asap... A village has 1,182 persons. Each person uses 13.4 kWh of electricity per day. They are considering installing a small run of river hydroelectric facility where the flow rate is 3.0 m3/s and the equivalent head is 20 m. The system has 90% efficiency and pipe losses are expected to be 5%. Determine if the proposed run-of-river facility can produce the required daily energy requirements if a micro hydrokinetic water turbine is used.arrow_forward
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