1. -------------------------------------
Geothermal energy as an electricity source in the region of Slovakia
Geophysical institute of SAS
Beladice, 2011

2. usual depths of bore holes are up to 3 - 5 km;
the mean temperature gradient at the Earth’s surface is about 30˚ C per 1 km
(up to 100 ˚ C in the depth of 3 km and about 300 ˚ C in the depth level of 10 km)
the geothermal sources for classical production of electricity are accessible
at the depth level km
usual depths of bore holes are up to km;
deeper (>10 km) ones are now exceptional
geothermal capacity of the Earth: all consumption of energy (past and future) should cause decrease of the mean temperature of the Earth only one degree in 40 milion years.....

4. 1 1 2
1 - hydro-geological source
2 - “hot dry rock” source

5. Classification of geothermal sources
according the utilization potential

6. In 1904 emerging steam was used to turn a small
turbine which powered five light bulbs - the first
ever demonstration of geothermal electricity
generation. (Larderello, Italy)
>
The world's first geothermal power station was
built in 1911 in Larderello, in Southern Tuscany, Italy and later …
<
(in 1913) a 250kW power station had been built which provided power for the Italian electric railway system.

9. Typical production of electric power

13. Husavik, nordth Island;
2MW – 80 percent of town electricity consumption (~2000 inhabitants)
120 ˚C – 80 ˚C; 90 kg/s; Kalina cycle technology

14. Kalina cycle – process diagram, Husavik
Turbine
Separator
Production well
Regenerator
Reinjection well
Warming-up
Pump

15. Binary cycle application regions in Slovakia
(minimal required depth distributions)

16. Classic cycle application regions in Slovakia
(minimal required depth distributions)