Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Water flows from an upper reservoir to a lower one while passing a turbine as shown.
1. Compute the total head loss due to friction when the discharge is 150 lit/s.
a. 4.25 m
b. 3.84 m
c. 5.67 m
d. 2.54 m
2. Find the velocity of water.
a. 2.05 m/s
b. 4.12 m/s
c. 3.06 m/s
d. 6.57 m/s
3. Find the power input of the turbine.
a. 213.5 kW
b. 210.6 kW
c. 115.2 kW
d. 356.2 kW
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.
In the mountains, hydroelectric facilities transport water from a reservoir through enclosed tubes to a turbine. In these plants, the intake tube of 100 cm (Point 2), 50 meters in diameter, is under the water surface of the reservoir (Point 1). Before the turbine falls into a 50-cm diameter bucket 200 meters through the tube (Point 3).
(a) What is the speed of the water in the image when the turbine approaches Point 3?(b) Calculate the flow rate of the water at Point 3(c) Calculate the pressure P at point 1 (water surface), point 2 (intake) and Point 3 (nozzle), respectively
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