(a) Calculate the main dimensions of the rotor (radius, chord length, and operating rpm) of a multi blade (18 blades with solidity 0.5) wind machine operating at a design wind speed of 25 kmph. The blade length is 1 m. The machine operates a reciprocating water pump having capacity (flow rate) of 5.1 m³/h and a lift ( water head) of 9 m. The efficiency of the reciprocating water pump is 0.6 and the transmission efficiency from the rotor to the pump is 0.9. Assume water density to be 996 kg/m³. For this multi blade machine Cp,max=0.31 and TSR = 0.75.

(a) Calculate the main dimensions of the rotor (radius, chord length, and operating rpm) of a multi blade (18 blades with solidity 0.5) wind machine operating at a design wind speed of 25 kmph. The blade length is 1 m. The machine operates a reciprocating water pump having capacity (flow rate) of 5.1 m³/h and a lift ( water head) of 9 m. The efficiency of the reciprocating water pump is 0.6 and the transmission efficiency from the rotor to the pump is 0.9. Assume water density to be 996 kg/m³. For this multi blade machine Cp,max=0.31 and TSR = 0.75.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

1
(a) Calculate the main dimensions of the rotor (radius, chord length, and operating rpm)
of a multi blade (18 blades with solidity 0.5) wind machine operating at a design wind
speed of 25 kmph. The blade length is 1 m. The machine operates a reciprocating water
pump having capacity flow rate) of 5.1 m³/h and a lift (water head) of 9 m. The
efficiency of the reciprocating water pump is 0.6 and the transmission efficiency from
the rotor to the pump is 0.9. Assume water density to be 996 kg/m³. For this multi blade
machine Cp,max=0.31 and TSR = 0.75.
(b) Find out design wind speed for a turbine at a particular location, which will give
more energy than any other wind speed. Assume that the wind speed frequency
distribution for that location has been given by the Weibull density function.

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Answer The following A twin jet Pelton wheel is required to generate 7500 KW when the available head at a nozzle is 400 m. Assuming generator efficiency of 95% overall wheel efficiency of 80% , coefficient of velocity as 0.98, speed ratio as 0.46, reduction in relative velocity while passing through bucket as 15% and taking that the jet is deflected through 165 by the bucket, the diameter of each jet O 13.69 cm 18.84 cm 20.21 cm 10.54 cm
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