Abstract
Numerical models of geothermal doublet allows us to reduce the high risk associated with the selection of the most effective location of a production well. Furthermore, modeling is a suitable tool to verify possible changes in operational geothermal parameters, which guarantees liveliness of the system. An appropriate selection of software as well as the methodology used to generate numerical models significantly affects the quality of the obtained results. In this paper, the authors discuss the influence of such parameters as grid density and distance between wells on the efficiency of geothermal heating plant. The last stage of the analysis was connected with estimation of geothermal power potential for a hypothetical geothermal doublet. Numerical simulations were carried out using the TOUGH2 code, which applies the finite-difference method. The research was conducted in the Szczecin Trough area (NW Poland), based on archival data from Choszczno IG-1 well. The results demonstrated that in the studied case of the Choszczno region, the changes in the distance of boreholes can have a visible influence on obtained results; however the grid density of the numerical model did not achieve a significant impact on it. The results show the significant importance of numerical modeling aimed at increasing the efficiency of a potential geothermal heating plant.
Highlights
Geothermal waters and energy utilization have a beneficial impact that improves the living conditions in any region where existing geothermal resources enable its effective use [1,2]
Conducted simulations confirmed the possibilities of geothermal energy utilization in the Choszczno Region, which was indicated as a prospective area in terms of geothermal energy utilization [20,21,36]
The results of the research work proves that modeling of the geothermal doublet can be effectively improved by selecting the maximum cell surface of the grid density, which can give precise results and will evaluate the computational time necessary to perform the simulation
Summary
Geothermal waters and energy utilization have a beneficial impact that improves the living conditions in any region where existing geothermal resources enable its effective use [1,2]. It is the kind of renewable energy whose resources are available regardless of weather conditions throughout the year and around all day. Mostly in Lower Jurassic and Lower Cretaceous aquifers. This kind of resources should be, first of all, used for heating purposes [6,7,8]
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