Question

Water under a head of 300 m is available for a hydel-plant situated at a distance of 2.35 km from the source. The frictional losses of energy for transporting water is equivalent to 26 m. A number of Pelton wheels are to be installed generating a total output of 18 MW. Determine the number of units to be installed, diameter of Pelton wheel and the jet diameter when the following data are available: Wheel speed 650 rpm.; ratio of bucket to jet speed 0.46; specific speed not to exceed 0.18; Cv and Ca for the nozzle 0.97 and 0.94 respectively and the overall efficiency of the wheel 87%.

Answer 1

venoten available at hydel Planh inihal is 3oom at distance of 2-1s km from ou loss of oater due to fction 26m pocsev of he shaft lema tt = Heat wat en aftes f ìction less: 300-26 : 27-4 m Speed af the sheel N sorpm oveall cfficienc Coeficicnt of uelocity Cu Coefficient of dischaide Cd=0.9 y 6 Yato speed Su o 46 71-120mls. ト1o-s finding speed of wheel But e tno that

Go 60×32-31-6 16 I am ete 。.qu xTyo. Ibox ㅋ 1 . I 2. = 么, basten poc sen 1612 ise c Qニ7.699 m3 , 344, 5.126