illinoislogsplitter

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In 2002, the Denver group teamed up with the National Renewable Energy Laboratory to build a home that generates a portion of its own electricity from sunlight using photovoltaic modules. Habitat also has collaborated with the Buildings Technology Center at Oak Ridge National Laboratory, a research and development group focused on promoting energy-efficient and environmentally sound building technologies, and the U.S. Department of Energy''s Building America program, which has built more than 14,000 homes with energy-efficient and affordable features. An initiative in Louden County, Tennessee, fostered Habitat''s construction of several Zero Energy Buildings. Structural insulated panels in the floors, walls and ceiling create a tight building envelope and provide insulation, allowing a smaller air conditioner to be installed. A heat-pump water heater saves about 60 percent in water heating energy costs. Solar-electric panels installed by the Tennessee Valley Authority provide power to the house and reduce demand on the utility grid. Some Habitat affiliates have begun to take their homes to even greener heights by incorporating more environmentally responsible building materials.

"In just 10 years, the number of chip mills in the region has more than tripled--to at least 150--each devouring an average of 10,000 acres of forest a year," says Danna Smith, executive director of the Dogwood Alliance, a consortium of environmental groups opposing chip mill operations. And with each American using up 688 pounds of paper a year (the Chinese consume just three), chip mills are not only profiting, they''re expanding.

[FIGURE 1-2 OMITTED]When the magnetic bearings are energized, the motor and impellers, which are keyed directly to the magnetic shaft, levitate. Permanent-magnetic bearings do the primary work, while digitally controlled electromagnets provide the fine positioning. Four positioning signals per bearing hold the levitated assembly to a tolerance of 0.00002 in. As the levitated assembly moves from the center point, the electromagnets'' intensity is adjusted to correct the position. These adjustments occur 6 million times a minute. The software has been designed to automatically compensate for any out-of-balance condition in the levitated assembly.SHUTDOWNS AND POWER FAILURESWhen the compressor is not running, the shaft assembly rests on graphite-lined, radially located touchdown bearings. The magnetic bearings normally position the rotor in the proper location, preventing contact between the rotor and other metallic surfaces. If the magnetic bearings fail, the touchdown bearings (also known as backup bearings) are used to prevent a compressor failure.

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