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Mines Could Provide Geothermal Energy
Madrid, Spain (SPX) Jul 29, 2009 Mine shafts on the point of being closed down could be used to provide geothermal energy to local towns. This is the conclusion of two engineers from the University of Oviedo, whose research is being published this month in the journal Renewable Energy. The method they have developed makes it possible to estimate the amount of heat that a tunnel could potentially provide. "One way of making use of low-intensity geothermal energy is to convert mine shafts into geothermal boilers, which could provide heating and hot water for people living nearby", Rafael Rodr�guez, from the Oviedo Higher Technical School of Mining Engineering, tells SINC. This type of energy, which is hardly used in Spain, is obtained from the internal heat of the Earth. The engineer and his colleague Mar�a Belarmina D�az have developed a "semi-empirical" method (part mathematical and part experimental) to calculate the amount of heat that could be produced by a mine tunnel that is due to be abandoned, based on studies carried out while it is still in use. "When the mine is still active one can access the tunnels easily in order to gather data about ventilation and the properties of the rocks, as well as to take samples and design better circuits, and even programme the closure of some sections in order to use them for geothermal energy production", says the engineer, who stresses that, although geothermal energy can be made use of once the mine is closed, "it is no longer possible by that stage to make any modifications, or to gather any useful data to evaluate and improve the system". The study looks into geothermal exploitation of a two-kilometre-long mine shaft, in which the temperature of the rocks 500m below the surface is around 30 degrees C. This is typical of many of the mining areas in Asturias, although it could also be applied to other parts of the world. Water could be forced in through tubes at 7 degrees C and return at 12 degrees C, a big enough heat gain to be of benefit to towns located above the mines.
Advantages of geothermal energy from mines Using geothermal energy also helps to reduce CO2 emissions, and is not dependent upon climatic conditions (unlike other renewable energies such as solar or wind power). Other advantages are that these facilities make use of a country's own resources, do not require new developments on large sites, do not pollute the immediate environment, and are believed to be profitable over the long term. Geothermal energy can be used directly in family homes, housing developments, swimming pools, fish farms, industrial units and other buildings. Share This Article With Planet Earth
Related Links FECYT - Spanish Foundation for Science and Technology
China energy firms must take action on climate: GreenpeaceBeijing (AFP) July 28, 2009 China's energy firms must do more to combat climate change and reduce dependence on coal, environmental group Greenpeace said on Tuesday, warning of a rise in "extreme" weather. "China is suffering the pains of extreme weather events such as droughts, heatwaves, typhoons and floods, worsened by climate change," Greenpeace China's climate campaigner Yang Ailun said as he unveiled a new ... read more |
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