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ENGRI 1290
HW04
Due 10/04/2010
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View Full Document Problem # 1
A 500 MW electrical hydro power plant is
using a reservoir with head given below. The
water then rushes inside a penstock and falls by
an extra 50 m. Because the penstock is a pipe,
friction reduces the water velocity. So the
efficiency of the penstock is not 100 % but
85%. The water then hits Francis turbines with
C
p
of 80 %. The plant has identical turbines.
The mechanical energy is turned into electricity
by generators with efficiency 95%.
1. Compute the water energy density at the entrance of the penstock.
2. Compute the water energy density gain
in the penstock.
3. What is the energy per kg of water extracted by the turbines?
4. What is the energy per kg of water extracted by the generators?
5. What is the mass flow rate of water through this dam?
NB: In this problem we ask for the energy density in J/kg.
Problem # 1 (continued)
The head is 150 m.
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View Full Document Problem # 2
The Threegorges dam in China
cost 24 billion dollars and can
generate the maximum power given
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This note was uploaded on 09/14/2011 for the course ENGRI 1290 taught by Professor Gourdain during the Fall '10 term at Cornell University (Engineering School).
 Fall '10
 GOURDAIN

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