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18 Questions

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Wind Turbine Energy Efficiency

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Questions and Answers

What is the optimal rated wind speed for the turbine in this site?

14.8 m/s

10.4 m/s (correct)

12.4 m/s

16.2 m/s

What is the ratio of the average power to the rated power for the optimized turbine?

0.7

0.6 (correct)

0.5

0.8

What is the effect of optimizing the turbine for this site on the total energy production?

A 4% increase (correct)

A 20% decrease

A 10% increase

A 2% decrease

What is the primary concern in achieving a 4% increase in total energy?

Cost-effectiveness of the electrical system Signup and view all the answers

What is the relationship between the rated power of the optimized turbine and the MOD-2 turbine?

The optimized turbine has a 56% higher rated power Signup and view all the answers

Why might the optimized system pose additional operating difficulties for other generating plants?

More intermittent operation Signup and view all the answers

What is the limitation of specifying only the rated power of a wind turbine?

It is not a suitable parameter for distinguishing between turbines Signup and view all the answers

What is the value of uR/c at which the normalized power is greatest for k = 2.3 and uc = 0.5uR?

1.6 Signup and view all the answers

What is the recommendation based on the analysis of the MOD-2 turbine on this site?

DO NOT build the MOD-2 on this site without modification Signup and view all the answers

What might be reduced by placing a larger generator on a given set of blades?

Yearly energy production Signup and view all the answers

What is an important factor to consider in addition to rated power when specifying a wind turbine?

Average power output in various wind regimes Signup and view all the answers

What might be the best decision in terms of wind turbine design?

Use the standard MOD-2 without any effort to optimize it Signup and view all the answers

What is the general guideline for good design when it comes to the categories of losses in a generator?

Fixed and variable losses should be approximately equal to each other Signup and view all the answers

Why are larger generators more efficient than smaller ones?

Because the ratio of volume to surface area increases with size Signup and view all the answers

What is the efficiency of a good quality generator with a 2-kW rating?

0.85 Signup and view all the answers

What is the effect of size on the efficiency of a generator?

Efficiency increases with size Signup and view all the answers

What should be included in a detailed economic study of generators?

The differences between very small and large generators Signup and view all the answers

What can be combined in an empirical equation to describe the efficiency of a generator?

The effects of rated power and actual power Signup and view all the answers