UGE-4K VERTICAL AXIS TURBINE
Another vertical axis wind turbine, the UGE-4k delivers about 4.2 kW at steady wind speeds of 16 mph. Winds need to hit that sweet spot, however, for the device to really deliver. At speeds of 13 mph, for example, it produces just .5 kW. That’s typical of many wind turbines and demonstrates why selection of a site with reliable winds is essential to their success. The system, with its composite blades, produces less than 38 db of noise when operating, and a standard tower height is 23’.
www.urbangreenenergy.com
HONEYWELL BLADE TIP POWER SYSTEM
The Honeywell Wind Turbine uses a system of magnets and stators surrounding its outer ring, capturing power at the blade tips where speed is greatest, eliminating mechanical resistance and drag. Rather than forcing the available wind to turn a generator, the perimeter power system becomes the generator by swiftly passing the blade tip magnets through the copper coil banks mounted onto the enclosed perimeter frame. The Blade Tip Power System addresses past constraints such as size, noise, vibration, and output. And, according to the maker, is the highest output, lowest cost per kWh installed wind turbine for the residential market.
www.windtronics.com
HEAT AND POWER COGENERATION
Industrial plants have used co-generation for decades as a cost-eff ective way to produce electricity, at the same time they’re producing heat. Also known as Combined Heat and Power (CHP) systems, residential-scale units have just begun to penetrate the market. Essentially, a “micro-CHP,” as the small units are often called, is a generator that converts its own waste heat into hot water (or hot air) for household heating, pool heating, or domestic hot water. CHPs tend to operate at efficiencies of about 90%-far better than the 40% efficiency of a centralized power plant. And there’s no grid maintenance required-although they may be grid connected. Recent developments include wood pellet-fueled models. We’ve yet to see these models in the United States, but they are already in limited production in Germany.
HYDRONIC FREEWATT CHP
This company was the first to make a push into the U.S. residential market with its gas-powered hybrid heat and power The system includes a Honda generator produces 1.2 kW of electricity, tied high-efficiency boiler. Re-use of waste household hot water results in an overall efficiency of more than 85%. The unit quietly, at only 47 db, and the resulting is so cool it can be vented through PVC pipes.
www.freewatt.com/
SUNMACHINE WOOD PELLET CHP
The SunMachine, a wood pellet CHP from Germany has mysteriously disappeared from online listings, but industry sources say they sold several hundred units in 2008 (in Europe). We include it here as evidence that a pellet-powered home-sized CHP exists. The unit’s 1-cylinder Stirling produces about 3 kW of electricity and 10.5 kW of thermal output, with an efficiency of 90%. The pellets can be supplied through an automatic silo feeder or added by hand.
www.powergenworldwide.com
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