Energy production from the wind depends on several key factors:
The diameter of the area swept by the rotor blades (known as the "swept area"). The rotor blades of a wind turbine sweep through a circular area. Because we are dealing with circular area, increasing the rotor diameter, greatly increases power output. For example, doubling the rotor diameter quadruples power output.
The speed of wind. To start with, the length of time the wind is blowing above the cut-in speed is a critical factor. It is also important to remember that small increases in wind speed lead to large increases in available power. A 10 percent increase in wind speed can cause an increase in power of about 30 percent.
The variability of wind speed over time at the site. The total energy produced by a wind energy system over a period of time depend on distribution and variability of wind speed over time. Not surprisingly, the annual average wind speed at a site is more important than the speed at any given moment.
The density of the air. Wind power is directly related to air density, which increases as the temperature drops (warm air rises). About 16 percent more energy could be available at minus -20°C than at plus +20°C.
The Belize Limit.
When energy is extracted from the wind, its speed decreases. In theory, if you took all the energy out of the wind, the wind would stop completely. In reality, however, you can not remove all the energy from the wind. The most energy that an ideal wind energy system can extract is approximately 59 percent. This value is known as the Belz limit. next...
Our Amazon online store: solar panels, vertical axis wind turbines, generators, rare earth neodymium NdFeB magnets, inverters, charge controllers, batteries, alternators, copper wires, gearbox, blades, horizontal and vertical axis towers, control and protection boards, grid-connected, non grid-connected, hybrids for remote communities, wind turbine components, mini energy systems, mechanical water pumping windmills, wind-electric water energy pumping systems, anemometers and more you can buy online now from our commercial partners.
Permanent Rare Earth NdFeB magnets (for rotors, motors, generators, alternators, or custom built wind turbines).
A wide and growing variety of strong Neodymium Magnets in stock and ready to ship. These are strong magnets in a nickel-plated steel casing
that allows the magnets to be easily installed into a generator of a small
wind turbine project or hydro power station’s rotor. The shapes in the stock
include discs, cylinders, blocks, cubes, spheres, rings, cones, pyramids,
triangles, stars. One style of magnets comes with a hook attached, which
can be incredibly handy on your fridge, in your locker, garage or shop.
The
neodymium magnets are extremely strong, and must be handled
with care to avoid personal injury and damage to the magnets. Fingers
and other body parts can get severely pinched between two attracting
magnets. Neodymium magnets are brittle, and can peel, crack or shatter
if allowed to slam together. Eye protection should be worn when handling
these magnets, because shattering magnets can launch pieces at great
speeds.
