What is the dollar cost of a megawatt wind turbine?
The megawatt size wind turbine seems to be a standard so why not have the cost of these machines available to compare with other type of electric generators?
In terms of the initial cost, just to purchase a commercial scale turbine, the usual price is roughly $1 million per megawatt of capacity. So, a GE 1.5 MW would cost around $1.5 million. Installation and development of the site would be additional costs.
What type of bearings to use in a savonius wind turbine?
I am currently building a savonius wind turbine that will be around half a meter tall. I have the general plan drawn up but just need some answers on what type of bearing to use – I really have no idea about different bearings/lubricants/size restraints etc. Would really appreciate any help that could be provided.
Basically you need a thrust bearing somewhere in the process to take the weight and another one or two bearings to take the wind force and keep it upright. If you are mounting above a generator, there might be a thrust bearing in the generator.
In your design, you have to provide for mounting the bearings. Lets suppose you were putting the unit on a shaft with a pulley on the bottom to drive a pump or generator off to the side via a belt. You would go to www.grainger com or local bearing firm and tell them you wanted a flat mount ball bearing for your shaft diameter – this would be the top support – and you wanted a flat mount thrust bearing for the bottom, as well as a shaft collar all to match the shaft. For your project these might total $15-20.
The simplest possible mount would be a stiff frame rectangle to which you mount the ball bearing in the middle of the top and the thrust bearing at the bottom. What the shaft collar does is screw to the shaft and rest against the bearing, transferring the weight. Since I have proposed a pulley, the shaft would have to be long enough to go through the frame to put the pulley below, so you didn’t have to take the unit apart to change the belt.
To be honest, most ball bearings even if not thrust, will take much more weight than your turbine and you could probably get the shaft collar and two bearings at your hardware store or home center where they are sold as replacements for wheel barrow and cart wheels
for another view
Powered by Yahoo! Answers
Use wind energy to generate electricity and charge into storage battery group. Through the multi-voltages power supply system, the electricity can be changed into DC and AC used for illumination, home appliances, communication devices and electric tools. This complete system comes with everything you need: blades, rotor, permanent magnet generator, tail vane, charging controller, dump load, inverter and hardware.
The wind power generator is an equipment to convert wind energy into electric power which is changed into storage battery group. It can be widely used in rich wind areas but without normal energy supply from any power system .It is capable of providing power for lighting, TV, telecommunication equipment and so on. This unit includes blades, wind rotor, permanent magnet generator, tail vane and hardware.
All items are BRAND NEW, never used and straight from the manufacturer
Blades: Our blades are made from lightweight, yet durable fiberglass. With a S809 airfoil design, pronounced pitch, and tapered tip, these blades will start at the slowest wind speeds and give you power with low noise levels. They have a polished finish for aesthetics that will make you proud.
Hub: Our steel hub is designed specifically for the blades. It has a tapered hole to securely lock it down onto a 1" shaf