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?

<p>Cost-effectiveness of the electrical system (B)</p> Signup and view all the answers

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

<p>The optimized turbine has a 56% higher rated power (D)</p> Signup and view all the answers

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

<p>More intermittent operation (D)</p> Signup and view all the answers

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

<p>It is not a suitable parameter for distinguishing between turbines (B)</p> 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?

<p>1.6 (B)</p> Signup and view all the answers

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

<p>DO NOT build the MOD-2 on this site without modification (C)</p> Signup and view all the answers

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

<p>Yearly energy production (B)</p> Signup and view all the answers

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

<p>Average power output in various wind regimes (B)</p> Signup and view all the answers

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

<p>Use the standard MOD-2 without any effort to optimize it (D)</p> 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?

<p>Fixed and variable losses should be approximately equal to each other (D)</p> Signup and view all the answers

Why are larger generators more efficient than smaller ones?

<p>Because the ratio of volume to surface area increases with size (C)</p> Signup and view all the answers

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

<p>0.85 (A)</p> Signup and view all the answers

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

<p>Efficiency increases with size (B)</p> Signup and view all the answers

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

<p>The differences between very small and large generators (C)</p> Signup and view all the answers

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

<p>The effects of rated power and actual power (D)</p> Signup and view all the answers

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