Formhals, J. ; Welsch, B. ; Sass, I. (2019)
Multi-criteria analysis of the integration of Solar Thermal Collectors and Borehole Thermal Energy Storage Systems into existing District Heating Grids.
10th European Geothermal PhD Day 2019. Potsdam, Germany (25.02.2019-27.02.2019)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
Solar district heating (SDH) is a rapidly expanding technology, which can help to replace large amounts of conventionally produced thermal energy by renewable heat. However, the inherent seasonal mismatch of heat demand and solar heat supply reduces its potential substantially. This drawback can be overcome by seasonal thermal energy storage. Due to their large capacities, Borehole Thermal Energy Storage (BTES) systems are particularly suited for district scale solutions. The efficiency of those systems and their components is highly dependent on the implemented operational temperature levels. To quantify those interdependent and partially opposing effects, a numerical case study is carried out, in which a SDH system with BTES is integrated into an existing district heating grid. For this purpose, a coupled numerical simulation approach has been developed, in which the above- and below-ground parts of the system are considered each in dedicated software environments. The BTES is simulated using FEFLOW, a finite-element software tool, taking into account the specific geology of the site under investigation. The SDH is simulated in SimulationX, a system simulation suite based on Modelica, providing detailed information about energy supply, demand and losses of the grid and each component. 16 different scenarios for the grid and storage discharge temperatures are analyzed taking into account energetic, economic and ecological criteria. The results show that optimal solutions can vary considerably according to the weighting of objectives. Furthermore, the study reveals that the optimization of the overall system in a multi-objective approach is much more important than focusing on component efficiencies only. However, the results are highly sensitive to economic boundary conditions. Accordingly, the considered regulatory framework and energy prices are very important.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Formhals, J. ; Welsch, B. ; Sass, I. |
| Art des Eintrags: | Bibliographie |
| Titel: | Multi-criteria analysis of the integration of Solar Thermal Collectors and Borehole Thermal Energy Storage Systems into existing District Heating Grids |
| Sprache: | Englisch |
| Publikationsjahr: | 26 Februar 2019 |
| Veranstaltungstitel: | 10th European Geothermal PhD Day 2019 |
| Veranstaltungsort: | Potsdam, Germany |
| Veranstaltungsdatum: | 25.02.2019-27.02.2019 |
| Kurzbeschreibung (Abstract): | Solar district heating (SDH) is a rapidly expanding technology, which can help to replace large amounts of conventionally produced thermal energy by renewable heat. However, the inherent seasonal mismatch of heat demand and solar heat supply reduces its potential substantially. This drawback can be overcome by seasonal thermal energy storage. Due to their large capacities, Borehole Thermal Energy Storage (BTES) systems are particularly suited for district scale solutions. The efficiency of those systems and their components is highly dependent on the implemented operational temperature levels. To quantify those interdependent and partially opposing effects, a numerical case study is carried out, in which a SDH system with BTES is integrated into an existing district heating grid. For this purpose, a coupled numerical simulation approach has been developed, in which the above- and below-ground parts of the system are considered each in dedicated software environments. The BTES is simulated using FEFLOW, a finite-element software tool, taking into account the specific geology of the site under investigation. The SDH is simulated in SimulationX, a system simulation suite based on Modelica, providing detailed information about energy supply, demand and losses of the grid and each component. 16 different scenarios for the grid and storage discharge temperatures are analyzed taking into account energetic, economic and ecological criteria. The results show that optimal solutions can vary considerably according to the weighting of objectives. Furthermore, the study reveals that the optimization of the overall system in a multi-objective approach is much more important than focusing on component efficiencies only. However, the results are highly sensitive to economic boundary conditions. Accordingly, the considered regulatory framework and energy prices are very important. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Angewandte Geothermie |
| Hinterlegungsdatum: | 07 Mai 2019 05:49 |
| Letzte Änderung: | 07 Mai 2019 12:10 |
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