Renewable energy sources. Geothermal energy

Abstract

Geothermal resources constitute that part of the heat content of the solid, liquid and gaseous phases of the Earth's crust that can be extracted from the Earth's interior and used at the current level of development of geothermal technology. Geothermal resources are divided into: subgeothermal, which are associated with the heat of underground aquifers and unsaturated water upper layers of the Earth to a depth of 500 m (this is low-enthalpy thermal energy, which is used using heat pump units); hydrothermal - the heat of deep underground thermal waters in the form of a geothermal coolant.