Question

How much ideal efficiency should practical turbine have?

(a) 10 – 12%

(b) 18 – 25%

(c) 80 – 90%

(d) 50 – 70%

This question was posed to me by my college professor while I was bunking the class.

Asked question is from Velocity and Power from Wind in portion Wind Energy of Energy Engineering

Answer 1

Correct answer is (d) 50 – 70%

The explanation: As wind turbine wheel cannot be completely closed, and because of spillage and other effects, practical turbines have 50 to 70% of the ideal efficiency. The real efficiency η is the product of this and ηmax and is the ratio of an actual to total power.

    P = ηPtot.