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Wind energy => Wind energy generators => Topic started by: infringer on March 24, 2009, 01:49:03 AM

Title: What are the key differnces of vertical and horizontal wind turbines
Post by: infringer on March 24, 2009, 01:49:03 AM
Which model has more torque? If any...

Why do big manufacturers build them with traditional style blades vs the horizontal style spinning blades?

What are the advantages and disadvantages of both?
Title: Re: What are the key differnces of vertical and horizontal wind turbines
Post by: exxcomm0n on March 24, 2009, 02:32:59 AM
Hey bud,

The major differences between the 2 that I have discovered are these:

1.) HAWT (horizontal axis wind turbine) is better than VAWT (vertical " " ")

a.) in conversion of wind speed to mechanical force by about a factor of 1/3 at least because of better angular encounter to the wind (meaning it has all its conversion mechanics are directed in confrontation with the wind and counter force from the turbine (blades, etc.) itself is negligible).

b.) It has a lower initial speed for the start of generation due to better torque conversion.

c.) It has a broader base of understanding and use in history.(Easier to get fixed and find parts for.)
You can buy blades for a HAWT.
You'll have to make your own VAWT vanes.


2.) VAWT is better than HAWT

a.)in that minor directional fluctuations in wind direction do not mean re-orienting the blade assembly  to face directly into the wind. It may not seem like much, but a 10 degree shift in wind direction can cost you a lot of production time until a HAWT is able to reposition itself into the face of the wind again.

b.) It has lower initial speed needed to start turning (NOT to be confused with initial speed for generation start!) and it does not need a helper motor to start spinning as some HAWTs have to have (the bigger the blade, the more necessary a starting motor assembly is).

c.) It's quieter. The larger area of the vanes and their shape do not have the tendency for (THWUCK, THWUCK, THWUCK) noise pollution.

d.) Its lower turbine turn speed and more continual (but lower) power output are supposed to mean that it can be mounted at a  much lower height than a HAWT. Some companies even advertise rooftop mounting (no extra tower).

Those are the hard and fast "rules" I've found in my quest to build a VAWT after I saw a blurb about Mag-Wind (or whatever the company is calling themselves this year) that has a VAWT design that makes a lot of sense to me, but has some pretty unbelievable claims for efficiency.

I think it might be a design that could be tweaked a little, and it is the most plentiful free energy I know of at the moment. ;)

Good production to your build!
Title: Re: What are the key differnces of vertical and horizontal wind turbines
Post by: jadaro2600 on March 24, 2009, 04:48:49 AM
Well, one obvious advantage of the vertical axis wind turbine is the fact that all serviceable parts are usually located at or near ground level, and the generator is located in an easily accessible place.

Also, the vertical axis wind turbines are more sexy!
Title: Re: What are the key differnces of vertical and horizontal wind turbines
Post by: infringer on March 25, 2009, 05:29:56 AM
Excommon and all to stop any confusion ...

Are you talking vertical meaning the way the blades spin correct.

So a normal 3 blade like GE would be vertical or horizontal?

I am thinking of purchasing 3 rubbermaid trash cans cutting them in half and double stacking them bottom to bottom not 100% yet have not settled on anything yet still curious on other folks ideas ...

I really do value all the excellent input and help with my venture I am thinking the more simplistic the better!

But cheap is good as well. But I will be taking pictures and documenting the process...

Thanks a million guys keep the suggestions comming!
Title: Re: What are the key differnces of vertical and horizontal wind turbines
Post by: TechStuf on March 25, 2009, 05:43:49 AM

Perhaps you may wish to consider making use of the wind near ground level by implementation of the aeroelastic flutter effect:

http://www.youtube.com/watch?v=paxI4y_WmZI

Or make use of the rooftop and build a simple horizontal turbine at the roof peak which catches the accelerated air coming up the roof.   Adding a shallow roof over the turbine will help catch more air into the blades and should prove quite productive.


TS
Title: Re: What are the key differnces of vertical and horizontal wind turbines
Post by: exxcomm0n on March 25, 2009, 05:52:46 AM
HAWT = horizontal = the old waterpump windmill seen in westerns = GE (I suppose).

VAWT = vertical = air speed measuring device (3 cups on a vertical axis) = blades/vanes traveling on the same plane horizontally

If I'm not mistaken, the horizontal/vertical is referencing the shaft and not the blades or vanes.


If you're thinking of a VAWT, it'll work better if it has a multiple of 3 for amount of vanes/blades (I personally like 6) so there is an imbalance of force on one side (2-4 vanes capturing the wind while 1-2 are moving in opposition to it).

This is a downside of VAWTs in that the design is working against itself (there is always a blade/vane moving in opposition of wind direction), so it is better to always have one side favored and multiples of 3 are good.