Abstract:
The European countries have few fossil fuel reserves and the main goal of the Lisbon strategy is to promote the utilization of
renewable energy sources. In Hungary, because of the huge amount of thermal water reserves, geothermal energy might be one of
the energy sources which can help to raise the share of renewables in the energy market of the country. Beside the positive aspects
the use of thermal water for energy purposes have some important physical, environmental and economical aspects which have a
moderating effect on the large scale spreading of these systems. This paper highlights the negative aspects of scaling from
hydraulic point of view. Practice has shown that in five years the cross section of a pipe might be reduced to one third. Having a
dynamic mathematical model of scaling process the expected pumping heat variation in time might be determined.