The Energy Ball is shaped like an eggbeater placed sideways, so that its blades turn around a horizontal axis.
NVDL: It makes sense that more and more individual households ought to either minimise their energy consumption, or find ways to get their energy 'off the grid'.
WIND turbines typically spin from tall towers on hills and plains. But in these green times, some companies hope smaller turbines will soon rise above a more domestic spot: homes and garages.
The rooftop turbines send the electricity they generate straight on to the home’s circuit box. Then owners in a suitably wind-swept location can watch the needle on their electricity meter turn backward instead of forward, reducing their utility bills while using a renewable resource.
One new model, the Swift Wind Turbine, is designed to do its job quietly, said Dave Anderson, co-director of Renewable Devices in Edinburgh, which has partnered with Cascade Engineering in Grand Rapids, Mich., to offer the turbine in the United States.
“The noisiest it gets is 35 decibels,” roughly the sound of a quiet conversation, he said of the whir of the blades. The turbine, which looks like a large wagon wheel, has a ring around its blades designed to diffuse noise and limit vibration. |
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