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Dallas' Southern Methodist University is now recycling energy with one of the first commercial electricity generators that use thermoelectricity—the act of drawing power from waste heat. The machine operates by using heat given off by other processes (such as manufacturing) to boil liquids, which then turn into steam, which then turns an electricity-generating turbine.
ElectraTherm's Waste Heat Generators recover heat from various sources without any specialized electronics or hard-to-maintain components. By boiling water up to 200°F, the generator can produce from 25kW to 1MW of fuel-free, emission-free electricity.
About 50% of all fuel burned by industrial sources becomes "waste heat." Though businesses can try to use fuel as efficiently as possible, nearly seven quadrillion Btu of waste heat still escapes to do nothing but warm the atmosphere. But ElectraTherm says that its products, if used widely, could recover the equivalent electric output of 92 500MW gas-fired power plants.
The company says that the university will recoup its purchase cost in three to four years, with electricity costing about three to four cents per kwH during that time. After the payback period, the cost per kWH will drop to less than a penny. If only ElectraTherm's machines could be hooked up to the hot air our politicians will spew come election day, then all our nation's energy problems would be solved. [Electratherm via Cnet]
1 comment:
This actually is done fairly frequently, though not frequently enough. I'm associated with Recycled Energy Development, a company that turns manufacturers' waste heat into clean power and steam. Estimates suggest we could slash greenhouse emissions by 20% by recycling energy at industrial plants. We also slash energy costs by improving efficiency, meaning less power is needed. This is where we should be headed.
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