Autor Tema: Wind generators  (Pročitano 14053 puta)

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« Odgovor #15 poslato: 02, 03, 2009, 11:37:12 pre podne »
Video sam u emisiji o jedrenju to o cemu pricamo, ima na camcu jarbol a na vrhu dugacka elisa kao za vetro generator preko prenosa se okretanje prenosi na osovinski vod i okrece elisu u vodi. Pokusaj je da se ide kontra vetra i radi dobro ali ima problema sa ziroskopskim efektom i mlati ona elisa pa izgleda zastrasujuce.  Ima ih nekoliko mislim u engleskoj.   
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« Odgovor #16 poslato: 05, 03, 2009, 22:15:28 posle podne »
evo umesto gige da postavim jedan link koji je on nasao


http://www.kupujemprodajem.com/VETROGENERATORI-7302-oglas.htm


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« Odgovor #17 poslato: 05, 03, 2009, 22:28:41 posle podne »
Ja cu da dodam jos jedan, jer se odnosi na taj prozvod :

http://www.musprodukt.com/page411210.asp

Hvala Giga

koliko dugo mogu da sluze ?

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???: Wind generators
« Odgovor #18 poslato: 06, 03, 2009, 11:32:01 pre podne »
Ne idite utabanim putem. Umesto toga krenite tamo gde puta nema i ostavite trag.

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« Odgovor #19 poslato: 07, 03, 2009, 22:06:14 posle podne »
Izvor podataka: http://www.windturbineblades.net/



2-Bladed Wind Turbines Versus 3-Bladed Wind Turbines
Why 3-Bladed Wind Turbines are Far Superior than 2-Bladed Wind Turbines

The argument has been settled and the debate is over.

Today's "modern" 3-bladed wind turbines represent the latest technological improvements in wind turbine generators, and are superior to the 20-30 year old technology that 2-bladed wind turbines represent.

First of all, it is important to remember that 2-bladed wind turbines may generate only about 90% of the power of a 3-bladed wind turbine of comparable size.  While a 2-bladed wind turbine saves the weight of one extra blade when compared with a 3-bladed wind turbine, engineers of the most efficient wind turbines have determined that the extra blade used on 3 bladed wind turbines provide the optimum wind turbine efficiency and wind turbine design for the "ideal" wind turbine generators of today. 

Secondly, the top-3 leading wind turbine manufacturers have standardized on the 3-bladed wind turbine.  They do not manufacture any 2-bladed wind turbines.  Plainly stated, a wind turbine with an even number of blades (2 blades or 4 blades) are NOT of optimum design or efficiency. In fact, this debate was settled years ago when the wind turbine engineers and designers began building wind turbines over 600 kW in power output.

The top-3 leading wind turbine manufacturers have standardized on the 3-bladed wind turbine.  They do not manufacture any 2-bladed wind turbines.  Plainly stated, a wind turbine with an even number of blades (2 blades or 4 blades) are NOT of optimum design or efficiency. In fact, this debate was settled years ago when the wind turbine engineers and designers began building wind turbines over 600 kW in power output.

The leading wind turbine manufacturers and their engineers have decided that 3 bladed wind turbines are the optimum number of wind turbine blades due to the stability of the wind turbine as well as the significant wind loads and stresses placed on a 2-bladed wind turbine.  A wind turbine that has an odd number of blades is similar to a disc when calculating the computational fluid dynamics of the wind turbine.  Engineers have learned that wind turbines that have an even number of blades - such as the 2 bladed wind turbines of the past - have stability problems for a machine with a stiff structure. The reason for this problem is simple, engineers recognized that when a 2-bladed wind turbine's top blade bends backwards - when the wind turbine's 2 blades are in the vertical position - since it is now generating the maximum power from the wind - that the lower or bottom blade is now aligned with the tower and the blade is hidden or blocked from the wind - and this generates a huge amount of stress and loads on the wind turbine and its' primary components such as the bearings, shaft, transmission etc.

Because of the extreme wind loads and stresses placed on 2-bladed wind turbines, the remaining 2-bladed wind turbine manufacturers have had to resort to a "teetered hub" that helps remove some of the stress and loads placed on 2-bladed wind turbines. While there are some very fine 2-bladed wind turbines, of smaller power output, the bottom line is, 3 bladed wind turbines are inherently better and more efficient than 2-bladed wind turbines.

For these reasons, community wind farm owners and developers, along with utility-scale wind farm owners and developers, would be wise to only consider 3-bladed wind turbines
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« Odgovor #20 poslato: 07, 03, 2009, 22:29:29 posle podne »
http://www.reuk.co.uk/Betz-Limit.htm

Calculation Of Wind Power
Calculate the power of the wind hitting your wind turbine generator


There are many complicated calculations and equations involved in understanding and constructing wind turbine generators however the layman need not worry about most of these and should instead ensure they remember the following vital information:

1) The power output of a wind generator is proportional to the area swept by the rotor - i.e. double the swept area and the power output will also double.
2) The power output of a wind generator is proportional to the cube of the wind speed - i.e. double the wind speed and the power output will increase by a factor of eight (2 x 2 x 2)!

If you are not mathematically minded you can quit now, however it is well worth trying to understand what is going on here.


The Power of Wind
Wind is made up of moving air molecules which have mass - though not a lot. Any moving object with mass carries kinetic energy in an amount which is given by the equation:


Kinetic Energy = 0.5 x Mass x Velocity2

where the mass is measured in kg, the velocity in m/s, and the energy is given in joules.

Air has a known density (around 1.23 kg/m3 at sea level), so the mass of air hitting our wind turbine (which sweeps a known area) each second is given by the following equation:


Mass/sec (kg/s) = Velocity (m/s) x Area (m2) x Density (kg/m3)

And therefore, the power (i.e. energy per second) in the wind hitting a wind turbine with a certain swept area is given by simply inserting the mass per second calculation into the standard kinetic energy equation given above resulting in the following vital equation:


Power = 0.5 x Swept Area x Air Density x Velocity3

where Power is given in Watts (i.e. joules/second), the Swept area in square metres, the Air density in kilograms per cubic metre, and the Velocity in metres per second.


Read World Wind Power Calculation
The world's largest wind turbine generator has a rotor blade diameter of 126 metres and so the rotors sweep an area of PI x (diameter/2)2 = 12470 m2! As this is an offshore wind turbine, we know it is situated at sea-level and so we know the air density is 1.23 kg/m3. The turbine is rated at 5MW in 30mph (14m/s) winds, and so putting in the known values we get:


Wind Power = 0.5 x 12,470 x 1.23 x (14 x 14 x 14)

...which gives us a wind power of around 21,000,000 Watts. Why is the power of the wind (21MW) so much larger than the rated power of the turbine generator (5MW)? Because of the Betz Limit, and inefficiencies in the system.

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« Odgovor #21 poslato: 07, 03, 2009, 22:35:46 posle podne »
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« Odgovor #22 poslato: 15, 03, 2009, 14:16:40 posle podne »
Evo jos jednog zanimljivog Hrvatskog sajta (foruma) sa tematikom vetrenjaca.
http://www.e-vozila.com/forum/viewforum.php?f=11

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« Odgovor #23 poslato: 07, 05, 2009, 21:12:48 posle podne »
Firma Elvet iz Pirota ovih dana pocinje sa prodajom vetro generatora! www.elvet.co.rs :)
Samo su dve stvari beskonacne - svemir i ljudska glupost. Doduše, za prvu nisam siguran

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« Odgovor #24 poslato: 08, 05, 2009, 00:21:07 pre podne »
Deda, istina da dolazi leto ali treba misliti i na zimu. Šta bi sa onim plinskim grejalicama?

ne stigoh ja da se organizujem ...

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« Odgovor #25 poslato: 12, 05, 2009, 19:25:01 posle podne »
Covek sam pravi panele i vetrenjace za male pare!! www.mdpub.com
Samo su dve stvari beskonacne - svemir i ljudska glupost. Doduše, za prvu nisam siguran

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« Odgovor #26 poslato: 16, 07, 2009, 09:31:43 pre podne »
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« Odgovor #27 poslato: 16, 07, 2009, 11:17:02 pre podne »
http://uk.geocities.com/fnsnclr@btinternet.com/yachts/auto/hist4.htm

Jos clanaka o camcima koje gura vetar pomocu propelera.
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« Odgovor #28 poslato: 16, 07, 2009, 11:45:11 pre podne »
Kako li ovo šušti kad radi. Ne bi smeo nijednog košarkaša pustiti na palubu da mu ne otkine glavu (mog kandidata za zeta od 2,12). Ne svidja mi se uopšte!!!

Bljak..... :shout:

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« Odgovor #29 poslato: 16, 07, 2009, 12:58:09 posle podne »
ja sam za solar...