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Beneath the streets of big cities concealed huge sources of clean energy

04 november 2013

Researchers have developed an analytical model for the study of heat fluxes and found that the accumulation of energy in tempo aquifers due mainly to increased surface temperatures and the release of thermal energy varied buildings. The results of the scientists can be found in the latest issue of the journal Environmental Science & Technology.

It is noteworthy that during the last decades of the energy density increased significantly. As an example, researchers led Karlsruhe (Germany). In 1977, the average density of heat flow in aquifers that agglomeration was 759 milliwatts per square meter. In 2011, the heat flux density reached 828 milliwatts per square meter. And the growth continues. The researchers note that accumulated in underground aquifers Karlsruhe thermal energy equivalent to 1 petajoules per year. It will be enough to provide heat for at least 18 000 households. The only question is how we can use this energy with minimal losses.

According to the researchers, the thermal energy of the near-surface groundwater aquifers can be used for heating buildings in the winter and cooling in summer. Help in this geothermal / ground source heat pumps. Such a step would cover a significant part of the growing demand for energy and reduce greenhouse gas emissions.
 
Source: http://energysafe.ru citing Environmental Science & Technology and Phys.org


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