Nazaruddin Sinaga , I agree with Hasan Ozcan 's answer. But is there a specific capacity of the wind plant that you are looking for? because with 3 m/s speed, the operational cost of the plants might not be met. In that case, one should do a proper feasibility analysis of capex + opex.

Thanks Hasan Ozcan and Srivats Shukla

Your comments very valuable for me.

Actually, I would like to make a research to evaluate the feasibility of utilizing wind energy potential in my country to produce anything, not only electricity. The national wind average velocity is only around 5 km/s. I know it has a low kinetic energy, thus producing very low electricity, if we utilize it with a common techniques.

If you have a simple application to evaluate the feasibility of wind energy utilization, please let me know.

Thank you

I think you wanted to write 5m/s not 5km/s. 5m/s as Hasan and Shukla mentioned can generate you enough energy depending on the height at which the wind speeds are measured and the size of the wind turbine to be used. Windspeeds are usually measured at 10 m above surface and I will assume the 5m/s average was measured at 10m height. wind speeds increase with height and depending on the size of the turbine, the windspeed at hub height will definitely be higher than the 5 m/s.

There are several applications that you can use to evaluate the feasibility of wind utilisation such as HOMER, RETSCreen etc. I for one has used RETSCreen before to do a similar analysis for my country and you can have a look at it and it will help you a lot.

Dear Nazaruddin Sinaga

In fact, above all, the speed of the wind varies from one place to another as well. The benefit of this energy and its exploitation depends on the size of the wind engine and its type. As my colleagues mentioned above, some wind engines can exploit a low speed of wind in power generation and currently the operating speed is about ~2 m/s.

Regards

Thanks Omar Hazem MOHAMMED

Yes, I know. It depends on the size and types of the wind turbine. I just want to know the rule of thumb of the wind's feasible speed.

More over, to create a higher wind turbine power from the low speed wind, what about if we make a wind accelerator to increase its speed? How do you thing?

Please give your comment.

Thank you

Dear researchers,

Have a nice weekend with your family....

Dear,

It is depend on selection of the suitable wind turbine ,economic analysis (calculating the key financial figures such as net present value (NPV), basic payback period (BPP) and the internal rate of return (IRR) ), hourly mean, monthly and seasonal power productions using the wind speed measurements in the region. Finally the results will show you if it is possible to obtain a reasonable capacity factor in low rated wind speed regions with suggested wind turbines.

regards

See the attached equation for power calculation, where density of air and velocity of wind can't be adjusted for a particular location. So the designer can only play with the size of blade for a particular place. Also, doubling the length of the blade reflect four times increase in power production. In general, designers look the best place for installation where the wind velocity is maximum, even little increase of wind velocity reflect huge increase in power production due to the cubic relation. In practical, the best wind turbines generally achieves 35-45% efficiency and the maximum possible theoretical limit (called Betz limit) is 59.3%.

Hi Nazaruddin

Generally, cut in wind speed is around 3m/s but 10m/s annual mean wind speed is good for wind farms. You should also consider regional annual mean wind speed instead national mean wind speed. You can check wind map of your country to see where is suitable for wind farms.

Dear all,

Thank you very much for your reply.

Actually, I'd like to know the feasible wind speed according to practical and economical aspects. As I know, from a company in Netherlands, it needs average wind speed around 6.5 - 7 m/s if we need BEP aof 5-7 years.

Regards,

Nazar

You can pick any location in the map, you will get wind and power resource details, then you can compare it with NREL classification

1. Open global wind atlas website, select location, select height (50m) at right bottom corner of map

https://globalwindatlas.info/

2. check power and wind speed in right side

3. Google "ML072040340", you will get single page NREL document for classification based on wind and power resources. Compare 50m height classification,

Class 1: Poor Resource

Class 2: Marginal Resource

Class 3: Fair Resource

Class 4: Good Resource

Class 5: Excellent Resource

Class 6: Outstanding Resource

Class 7: Superb Resource

Thanks M. Mohamed Sajeer

I will have a look....

Dear Sir,

for large scale investment the required annual average wind speed not less than 9m/s like the big projects of Egypt, Jordan, Iran, Yemen, Turkey, ......etc

Thanks dear Naseer K. Kasim

Could you give us a sample of study which state that the wind speed is not less than 9 m/s, please?

Dear Sir,

For getting more data u can contact the Regional Center of Renewable Energy and Energy Efficiency (RCREEE) where headquarter in Egypt/Cairo through the website WWW. RCREEE. COM

Regards

Thank you very much dear Naseer K. Kasim ,

Your reply is very valuable for us.

Dear respected scholars, please join our important and interesting discussion at:

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We are discussing about creating an international organization of lecturers and researchers for us. I think you would like to be a member or organizer.

Thank you very much.

Best regards.

Please refer to IEC 61400 for wind classes. Any wind resources on site between a Class III (Low) and Class II (Medium) with an average wind speed of 7.94 m/s at 100 m hub height and 7.65 m/s at 80 m hub height is considered commercially feasible.

Dear Harry Istepanian ,

Thank you very much for your reply.

welcome..

Please have a look on the attached file.

Best Regards

Thank you dear Ali Alhelal for your reply and share.

Dear Sir,

The average wind speed at hub height in most wind farms worldwide ranges from 6 m/s to 9 m/s according to: https://resdm.com/wind-farms-analyzer