First Geothermal Energy Utilization System Based on Medium Enthalpy Reservoir in Hungary

Abstract

Although there are some medium enthalpy reservoirs (120 °C < Treservoir < 180 °C) known in Hungary, geothermal energy utilization has been based only on low enthalpy ones so far. A comprehensive study and plans have been recently made analysing the possibility of establishing a geothermal heating and cooling system using a medium enthalpy carbonate geothermal reservoir near the town of Kiskunhalas. The reservoir was revealed by dry hydrocarbon holes during the 80’s. According to the geological studies and model estimations, two production wells could supply 250 m3/h 120 °C thermal water and cover the heating energy demand of local governmental institutes (mayor’s office, kindergartens, schools, health centres, hospital, museums), block houses, horticultures and factories. Cooling at industrial consumers using by sorption chillers will be also part of the 19.5 MWth system. After the energetic use the thermal water will be re-injected into the same reservoir through two injection wells.