Archive for December, 2010

Three-Phase AC Wind Turbine ~Nuts & Volts

A few months ago, I was looking through a copy of the magazine “Nuts & Volts” and saw a great little project article by John Gavlik.  Their article was about building a generator out of an attic wind ventilator.   I admit I have thought about this several times for many years, but their article really let my brain juices flow.

Their attic wind ventilator generator article in in their January 2010 issue,is part 6 and 7 of a series of articles titled “Experiments with Alternative Energy.”  Their AC wind turbine project outlined int the articles is really more of a science fair type of project.  But, they had a working generator capable of generating real electricity at a fairly low amperage. They even sell all the parts except the actual ventilator in their store.  With the knowledge gleaned from their articles, one can pretty easily come up with “modifications” to create a useful working power generator.

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Geothermal Energy

Typical GHP systemGeothermal energy is basically temperature from the earth.  You may have heard the term “geothermal heat pump” or just “heat pump” thrown around when talking about home heating.  Geothermal energy has been around since the beginning of the earth, but, in the late 1940’s, man has  fashioned it for his own use for controlling the temperature of his homes and businesses.

A geothermal heat pump or GHP is sometimes called a GeoExchange, earth-couple, ground-source, or water-source heat pump.  The term “geothermal” is used because energy is derived from the constant temperature of the earth as opposed to using outside air temperature as the exchange medium. Geothermal energy systems can reach very high efficiencies such as 300 to 600 percent on the coldest of winter nights, as compared to around 175 to 250 percent for standard air-source heating systems on cool days and may be combined with solar heating to form a geosolar system with even greater efficiency.

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