The preferable geothermal conditions of Hungary give good opportunities to produce geothermal energy. Besides this well-known fact, Hungary also concentrates on the investigation of industrial waste heat underground storage possibilities. In Northern-Hungary there are many industrial areas with high amount of waste heat emission. Nowadays, most of the unused heat is released into surface waters, and there is no reutilization activity. On the other hand, several heat storage technologies are known, which use geologic formations as a storage volume. During our investigations, we outlined different heat storage possibilities of shallow porous formations using real data. We decided that one of our test sites could be in Tiszaújváros, because this is an industrial area, which produce a high amount of waste heat, and on the other hand, we have detailed geological information about this test site.
The presented research analyses the use of hot wastewater coming from the cooling systems of huge enterprises. The industrial waste heat can be stored in sedimentary aquifer thermal storage systems (ATES), and later it can be used as a heat source in heating systems during wintertime. The aim of the conducted research is to assess the heat storage capacity of the underground sediment formations at Tiszaújváros industrial town through three-dimensional groundwater flow and heat transport simulations, as well as to identify the ideal parameters of storage using different scenarios. The simulations have been developed using MT3DS as heat transport simulator. We developed a basic simplified model, with 700 m total thickness, and a 100 m thick ATES layer in it. In this simplified model four different types of well locations were investigated. In the models we used injection wells which inject hot water in the sedimentary target formation, and we used production a well or wells to pump the stored hot water to the surface. We calculated energetic efficiencies for each basic situation. Based on the obtained results, it is possible to realize a well-working and reliable underground heat strorage system.
The research was carried out in the framework of the GINOP-2.3.2-15-2016-00010 ‘Development of enhanced engineering methods with the aim at utilization of subterranean energy resources’ project of the Research Institute of Applied Earth Sciences of the University of Miskolc in the framework of the Széchenyi 2020 Plan, funded by the European Union, co-financed by the European Structural and Investment Funds.