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QUESTION 1: A hydro-electric plant is planned for a site where the available head is 286...

QUESTION 1: A hydro-electric plant is planned for a site where the available head is 286 m with an average flow of 42 m3/s.

1.1 What is the available hydraulic power? ANS: 117.84 MW

1.2 Assuming an overall efficiency of 88% and a runner rotational speed of 450 rpm, what is the dimensionless specific speed? ANS: NSt = 0.705 rads

1.3 What kind of turbine is suggested for this application? In order to predict the operational performance of the turbine, it is decided to do tests on a 1:20 scale model turbine operating under a head of 4 m. 1.3 At what speed is the model expected to run at? ANS: 1064.36 rpm

1.4 What flow rate would have to be provided for the model? ANS: 0.012 m3/s

1.5 What power is the model expected to deliver? ANS: 487.27 W

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