The secret of these results is the “Venturi-effect”, inspired by river currents. The Energy Ball, which can be placed on a roof or on a mast in the garden, is said to deliver more energy than a traditional windmill, and to generate electricity at a very low wind speed of 2 metres per second (Beaufort 2).
The windmill is made by a company named “ Home Energy” (read a snippet of their website in English, French and Swedish). The few that are include the “ Energy Ball”, a product from the Netherlands which is also sold in the neighbouring country of Belgium. Most of these windmills are not yet commercially available, which makes it hard to verify whether or not the claims of the designers are justified. Yet, the designers of urban windmills all claim to have invented a “revolutionary” windmill, especially created for the low wind speeds in those environments. In cities, however, this is not the case. They are preferably placed on an open plain, as high as possible, with no obstacles around.
#Small home wind generators free#
Through the ages, windmills have always demanded a free flow of strong wind. Small windmills in built-up environments are a remarkable trend. It’s difficult to keep track of the numerous proposed new designs, meant to be placed on the roof or on a mast in the garden. Small windmills have been around for some decades, but in recent years the focus has shifted on developing their potential use in an urban environment (where most of us live).
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