MyNews24 is a user-generated section of The stories here come from users.

Comments: 11
Article views: 947
Latest Badges:

View all ZION's badges.

Wind turbines less efficient than claimed

03 November 2012, 15:03


The use of coal and nuclear energy to drive power stations has attracted more and more dissension in the power generating industry.  The obvious solution which usually arises from discussion in the field is ”Use wind power ”The use of wind power may have its advantages but, too, its disadvantages. The obvious disadvantage is lack of wind and a second important disadvantage is the poor efficiency to be had from Wind turbines and on wind farms. People seldom equate efficiency with the kinetic energy of the wind.

A study was carried out to determine the wind energy generated by dozens of wind farms, the majority which are in Scotland .between November 2009 and 2010.  Overall they actually ran at 22% of capacity.It is commonly expected that the wind farm runs at 33% capacity over a period of a year.

BETZ  LAW      According to BETZ LAW, No turbine can capture more than 59,3%Of the kinetic energy of the wind.  The factor 16/27 (0,593)  Is known as Betz’s coefficient. Practical utility scale wind turbines achieve at peak 75% To 80% of the Betz limit.  The Betz limit places an upper boundary on the annual limit that can be extracted at a site.    

World’s most efficient wind turbine in its class:GE’S1,6 - 100 wind turbine, 1,5MW. 31 turbines will be used in Turkey to power 14*000 Turkish households.    

The turbine power is approximately proportional to the third power of the wind velocity.  Many engineers feel that the overall design of turbines is still far from optimal.    

Total wind power could be captured only if the wind velocity is reduced to zero.  In a realistic turbine this is impossible as the captured air must leave the turbine.  A relation between input and output wind velocity must be considered.  The maximal achievable extraction of wind power by a wind turbine is 59,3 % of the total theoretical wind power.    

In many cases, but it is not the norm, that fuel powered stations are cheaper than wind powered station. This is applicable to islands and coastal stations. This may have to do with corrosion caused by humidity and salt in the atmosphere.     

Wind power costs may be constant over the entire life time of the unit while that of say coal may increase by more than double over its lifetime.Additional costs are due to increasing fuel costs and labour costs. Coal fired powers stations must bear the costs of CO2  emissions, combating it . and costs in accordance with international standards
Disclaimer: All articles and letters published on MyNews24 have been independently written by members of News24's community. The views of users published on News24 are therefore their own and do not necessarily represent the views of News24. News24 editors also reserve the right to edit or delete any and all comments received. publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.

Comment on this story
Comments have been closed for this article.

Read more from our Users

Submitted by
The Problem With Munghana Lonene ...

South Africa is very known for its ability to advance its indigenous languages, thus ensuring that no ethnic group is isolated. Read more...

0 comments 346 views
Submitted by
Kdoggy dog
Malema : Future leader of destruc...

When Juju spoke against Nelson Mandela about the way that he sold out the "revolution", the nation was disgusted. Read more...

0 comments 698 views
Submitted by
Eric de Castro
Cleaning up the hood

In order to get things done in this godforsaken country of ours, you sometimes have to break the law. Read more...

0 comments 58 views
Submitted by
Ginny Stone
HIV AIDS - in a nutshell!

By the time you sit your kids down for that chat about the birds and the bees, they’ve already been there, done that and in some cases, are wearing the t-shirt. And they haven’t got a clue. Nor do you! Read more...

0 comments 133 views
Submitted by
John Stoltz
Deploy ex ministers to municipali...

Dear Mr Zuma, in any long standing democracy, ex ministers are deployed with success! Read more...

0 comments 465 views
Submitted by
Trudy Mhluli
R 936 million later

The Auditor General, Kimi Makwetu, yesterday in his annual audit report disclosed revealed, and substantiated that close to R 1 billion (that is one thousand million rand) that was spent by government and for that matter the ANC in the financial year 2014/15 can be considered as irregular, unlawful, unauthorised, fruitless and wasteful expenditure. Read more...

0 comments 697 views


E-mail Alerts The latest headlines in your inbox

RSS feeds News delivered really simply.

Mobile News24 on your mobile or PDA

E-mail Newsletters You choose what you want

News24 on Android Get the latest from News24 on your Android device.

SMS Alerts Get breaking news stories via SMS.

TV Get us in your home, on your television.

Interactive Advertising Bureau
© 2015 All rights reserved.
There are new stories on the homepage. Click here to see them.


Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.

Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire network.


Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.

Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.