Geothermal energy is not really a renewable source of energy because it comes from the hot core of the earth, which has a temperature over 4000 ° C. Due to the inexhaustible supply of resources but among those ranks. On the surface goes through cracks in the volcanic rocks.
In Slovakia is located 25 prospective areas of geothermal water temperature to 150 ° C at depths to 5000 m. These springs are used mainly in agriculture. Today it is used for heating swimming pools with geothermal water, heating hospitals and residential development. Today's use of the SR is limited because of the high financial cost. Advantages of geothermal energy are high performance and no production of pollutants and the ability to position anywhere on the mainland. The disadvantage is that the use of this energy increases the number of earthquakes, loosing the earth's crust and the risk of leakage of toxic compounds from the well.
In practice, however, can also use geothermal energy from the lower calorific value than that of the superheated water, respectively. para. Only a few degree differences from the outside temperature can be utilized in heat pumps, which operate on the principle of thermodynamic cooling circulation.
Heat pump or cooling equipment can be used for heating and cooling processes in turn (especially in winter, hot air heating and air conditioning in summer) or even simultaneously, which is energy efficient. Using a heat pump of 1 kWh can be obtained on average approx. 2.5 to 4 kWh of thermal energy.