FLUID MECHANICS FUND. (LL)-W/ACCESS
4th Edition
ISBN: 9781266016042
Author: CENGEL
Publisher: MCG CUSTOM
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Chapter 5, Problem 78EP
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 8$ percent, determine the minimum flow rate required to generate 100 kV of electricity.
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Data from a certain hydroelectric power plant that uses Francis turbines are as follows: head water elevation of 60 m; tail water elevation of 15 m; head losses thru penstock of about 3 m; flow thru penstock at 3 cumex; hydraulic efficiency of turbine at 97%; mechanical efficiency of turbine at 96%; volumetric efficiency of turbine at 98%; and generator efficiency of 96%. Calculate the electrical power generated in kW.
15. Refer to the figure below. In a hydroelectric power plant, 70m³/s of water (p =
1010kg/m³) flows from an elevation of 125m to a turbine, where electric power is
generated. The overall efficiency of the turbine-generator is 84% (16% of total
energy was lost). Disregarding frictional losses in piping, estimate the electric
power output of this plant.
70mis
125m
Turbine
Generator
utine p
84%
Refer to Problem 15
In a hydroelectric station, water is available at the rate of 175 m³/s under a head of 18 m. If the available turbines run at a speed of 150 rpm with overall efficiency of 82 per cent, find the number of turbines of the same size required in case of (a) Francis turbine with maximum specific speed of 460 (b) Kaplan turbine with maximum specific speed of 350.
Chapter 5 Solutions
FLUID MECHANICS FUND. (LL)-W/ACCESS
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