By A. Strub (auth.), A. S. Strub, P. Ungemach (eds.)

The first concern in strength costs used to be surely a robust stimulus for the involvement of the fee of the ecu groups in learn and improvement on substitute strength resources. certainly, the necessity to triumph over problems confronted through the neighborhood as an entire, rather these caused by its seriously unbalanced power provide, made a standard neighborhood method look specifically apt. This reasoning additionally applies to power R&D, considering that responses to the obstacle will be not just political or financial, but additionally clinical. 4 years have handed because the choice of the Council of Ministers to release the 1st neighborhood strength study and improvement Programme, facing geothermal power, solar power, hydrogen creation and utili­ sation, strength conservation and effort platforms research. A seminar on geo­ thermal strength was once held years in the past to record on paintings in development on the half-way degree of the four-year programme. the second one foreign seminar, pronounced during this quantity, was once arrang­ ed with the intention to provide a chance to envision the ultimate end result of this group funding in examine in geothermal strength. This lawsuits quantity accordingly has major goals: - to give an review of the result of the neighborhood geothermal programme, through eighty three formal stories describing the person learn programmes; - to teach how the neighborhood study programme suits into the final context of nationwide and foreign learn on geothermal strength, by way of together with the shows of six visitor audio system who brought the periods and gave keynote addresses.

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Additional resources for Advances in European Geothermal Research: Proceedings of the Second International Seminar on the Results of EC Geothermal Energy Research, held in Strasbourg, 4–6 March 1980

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Projects exist for the centraLized heating of individuaL houses. In the United Kingdom, as we have seen, a system for geothermaL feedwater-heating in thermaL power stations is being studied. Two demonstration projects have now been started, whereby the oiL-fired heating in greenhouses wiLL be repLaced by a geothermaL heat exchanger. In any event, industriaL and agricuLturaL appLications are compLicated by the Long payback time for geothermaL energy (up to ten years), when undertakings rareLy want times greater than two years, since their very existence is heaviLy dependent on the market and hence on the business cycLe.

The first expLoits the particuLar texture of granite: seLective dissolution of the silicates resuLts in a seLf-propped fracture which obviates the need to circuLate a heat transfer fluid at high pressure. The second results from cooLing the rock and is a method whereby, theoreticaLLy, a fracturing network perpendicular to the hydraulic fracture -32- is deveLoped as a resuLt of the tensiLe stresses due to contraction of the rock voLume. ThermaL cooLing is currentLy used for the stimuLation of geothermaL weLLs in IceLand and New ZeaLand in rocks which however exhibit some porosity.

Such operations would be made easier if, as we beLieve, certain expLoration programmes receive in one way or another a significant amount of direct or - 19- indirect pubLic assistance. More geothermaL engineers wouLd aLso have to acquire the technological skills needed for this type of well servicing and operations. DownhoLe instrumentation It has aLso been possibLe, in this part of our programme, to deveLop downhoLe instrumentation which is better adapted to professionaL requirements. PracticaLLy aLL the teams engaged in fieLd-tests for measuring geothermaL heat fLows have designed and buiLt their own equipment.

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