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Power from Not-So-Hot Geothermal
This power system could make it feasible to generate cheap electricity from lukewarm geothermal sources.
By Prachi Patel-Predd, Thursday, September 21, 2006 @ Technology Review
Excerpts
1. A large share of the geothermal resources suitable for power generation - with temperatures higher than 300°F - are deep underground, beyond the reach of current technology.
2. Lower-temperature resources, common across the United States, are generally used for heating, but could be a bountiful source of power as well, if researchers were able to find an economical way to convert them into electricity.
3. A company says they have developed a low-cost system that can utilize low-temperature geothermal resources. The technology could be particularly useful in generating electricity from waste hot water generated at oil and gas wells.
4. In this technology, steam or hot water vaporizes a hydrofluorocarbon refrigerant that drives the turbine - the refrigerant has a lower boiling point than water.
5. The UTRC power plant can be thought of as a reverse cooling system.
6. In Texas alone, more than 12 billon barrels of water are produced from wells. Oil companies usually discard the waste water by re-injecting it into the earth.
Companies/organizations mentioned: United Technologies Research Center (UTRC), a unit of United Technologies based in East Hartford, CT, Carrier Corp.,
Personalities mentioned: Bruce Biederman, who leads the project at UTRC
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