“The power available to a wind turbine is based on the density of the air (usually about 1.2 kg/m3), the swept area of the turbine blades (picture a big circle being made by the spinning blades), and the velocity of the wind. Of these, clearly, the most variable input is wind spe...
A typical wind turbine nacelle is 85 meters (280 feet) off the ground—that's like 50 tall adults standing on one another's shoulders! There's a good reason for this. If you've ever stood on a hill that's the tallest point for miles around, you'll know that wind travels much ...
A small wind energy system can be used to augment your utility source to power appliances, lighting, and heat. These stand alone systems can be appropriate for homes or farms and can help you get on your way towards energy independence.
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Most propeller-driven planes today use more traditional engine configurations (like a flat four-cylinder) or modern gas turbine engines. Gas turbines are much lighter than radial engines for the power they produce. One place where you can still see the influence of the radial engine concept is ...
How can you make a better steam turbine? Find out more Why does steam contain so much energy? If you've ever burned yourself with steam, you'll know it's incredibly painful—and much more so than an ordinary hot water burn. If water and steam are at the same temperature, why does ...
How much does it cost to replace a circuit breaker panel? According to Home Guide, the average cost to replace a breaker box is $1,475. A low-amp subpanel costs up to $1,000, a 200-amp panel upgrade runs up to $2,500, and a 400-amp panel can cost up to $4,000. Of course...
As mentioned before, this is because the historical cost of coal is consistent with a random walk without drift, and currently fuel is about 40% of total costs. If coal remains constant in cost (except for random fluctuations up or down) then this places a hard bound on how much the ...
How much does it cost to build a combined cycle power plant? Nearly 75% of the natural gas capacity installed in 2015 were combined-cycle units, which had an average installed cost of$614/kW. Combined-cycle natural gas plants include at least one combustion turbine and one steam turbine and...
Vertical-axis wind turbines (VAWTs) are pretty rare. The only one currently in commercial production is the Darrieus turbine, which looks kind of like an egg beater. Photo courtesy NREL (left) and Solwind Ltd Vertical-axis wind turbines (left: Darrieus turbine) In a VAWT, the shaft is ...