NDLI: Telescopic Wind Turbines to Capture Energy at Low Wind Speeds

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Imraan, Mustahib Rajnish, N. Sharma Richard, G. J. Flay
Copyright Year	2009
Abstract	The reduction in cost of energy of wind turbines requires many technical contributions from all areas of the Wind Energy Conversion System. The variations in the wind (e.g. Diurnal, Monthly, Seasonal and Long term) as normally shown on probability density distributions directly affect the wind turbine performance. The turbine power output is also dependent upon a number of other variables, and a lot of research has been carried out to increase the power coefficient that has an upper limit of 0.593 called the Betz Limit. A possible way for improving the power output of a turbine is to control the swept area by controlling the diameter of the rotor. Ideally the wind turbine designer will use the long term mean wind speed to design and establish the rated power output of the wind energy conversion system. The stochastic nature of wind will fluctuate the power output of the turbine. Therefore to maintain the design rated power of the turbine, the telescopic wind turbine concept can be used. When the wind speed drops, the telescopic blades extend in order to maintain the power output, and when the wind speed increases, the telescopic blades retract in order to reduce the loads on the system. By telescoping the blades, the capacity factor of the wind energy conversion system is thus enhanced. The wind energy characteristic of a region in New Zealand was studied and the results show an 18% increase in annual energy production of a 10 kW wind turbine with telescopic blades.
Sponsorship	Advanced Energy Systems Division and Solar Energy Division
Starting Page	935
Ending Page	942
Page Count	8
File Format	PDF
ISBN	9780791848906
DOI	10.1115/ES2009-90118
e-ISBN	9780791838518
Volume Number	ASME 2009 3rd International Conference on Energy Sustainability, Volume 2
Conference Proceedings	ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences
Language	English
Publisher Date	2009-07-19
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Design Wind Wind energy Blades Rotors Wind velocity Energy generation Probability Wind turbines Density Turbines Stress
Content Type	Text
Resource Type	Article

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