[{"type":"dissertation","status":"public","abstract":[{"text":"Diese Arbeit behandelt die Modellierung und Optimierung von mit Phasenwechselmaterialien (PCM) ausgestatteten, energietechnischen Komponenten anhand zweier Fallstudien. PCM sind Materialien, deren Phasenwechseleigenschaften während des Schmelzens und Erstarrens für Heiz- und Kühlzwecke genutzt werden. Zunächst werden die theoretischen Grundlagen zu Wärmeübertragungsproblemen mit Phasenwechsel erörtert und entsprechende numerische Lösungsmethoden diskutiert. Ein Modell für Phasenwechselvorgänge wird vorgestellt, welches anhand analytischer Lösungen validiert wurde und in den Fallstudien zum Einsatz kam. Für beide Fallstudien wird der Stand der Technik erörtert und die entsprechenden Forschungsfragen werden formuliert. Die erste Fallstudie behandelt PCM-integrierte Photovoltaikmodule und die zweite Festbett-Latentwärmespeicher, welche nicht-kugelförmiger PCM-Kapseln verwenden. Für beide Systeme wurden thermische Model-le entwickelt und anhand experimenteller Daten mit guter Genauigkeit validiert. Diese Modelle wurden in Parameterstudien eingesetzt, um optimierte Systemkonfigurationen zu identifizieren. Die vorgestellten Ergebnisse zeigen, dass ein PCM-Kühlkörper mit ausreichender Dicke und Wärmeleitfähigkeit den Wirkungsgrad und die Lebensdauer von Photovoltaikmodulen erheblich erhöht. Darüber hinaus verbessern PCM-Kapseln mit hoher Packungs-dichte und Oberfläche sowohl die volumenspezifische Speicherkapazität als auch die thermische Leistung von Festbett-Latentwärmespeichern.","lang":"ger"},{"lang":"eng","text":"This thesis explores the modeling and optimization of energy system components incorporating phase change materials (PCM) through two different case studies. PCM are materials whose phase change characteristics during melting and solidification are utilized for heating and cooling purposes. The theoretical foundations of heat transfer problems involving phase change, along with the relevant numerical solution methods, are discussed. A phase change model is presented, which was validated against analytical solutions and applied in the case studies. For both case studies, a review of the state of the art is provided, followed by the formulation of specific research problems. The first case study investigated PCM-enhanced photovoltaic modules, while the second focused on packed bed latent heat storages (PBLHS) utilizing non-spherical PCM capsules. Thermal models were developed for both systems and validated with good accuracy against experimental data. These models were employed in parameter studies to identify optimized system configurations. The presented results demonstrate that a PCM heat sink with sufficient thickness and thermal conductivity can significantly improve the efficiency and lifespan of photovoltaic modules. Furthermore, PCM capsules with both high packing density and surface area increase the volume-specific storage capacity and thermal power output of PBLHS."}],"department":[{"_id":"9"}],"user_id":"66520","_id":"59239","language":[{"iso":"eng"}],"keyword":["Heat transfer","PCM","numerical simulation","renewable energy","heat storage"],"publication_status":"published","citation":{"ama":"Grabo M. <i>Modeling and Optimization of Energy System Components Equipped with Phase Change Materials</i>.; 2025. doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2199\">10.17619/UNIPB/1-2199</a>","chicago":"Grabo, Matti. <i>Modeling and Optimization of Energy System Components Equipped with Phase Change Materials</i>. Paderborn, 2025. <a href=\"https://doi.org/10.17619/UNIPB/1-2199\">https://doi.org/10.17619/UNIPB/1-2199</a>.","ieee":"M. Grabo, <i>Modeling and optimization of energy system components equipped with phase change materials</i>. Paderborn, 2025.","apa":"Grabo, M. (2025). <i>Modeling and optimization of energy system components equipped with phase change materials</i>. <a href=\"https://doi.org/10.17619/UNIPB/1-2199\">https://doi.org/10.17619/UNIPB/1-2199</a>","mla":"Grabo, Matti. <i>Modeling and Optimization of Energy System Components Equipped with Phase Change Materials</i>. 2025, doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2199\">10.17619/UNIPB/1-2199</a>.","short":"M. Grabo, Modeling and Optimization of Energy System Components Equipped with Phase Change Materials, Paderborn, 2025.","bibtex":"@book{Grabo_2025, place={Paderborn}, title={Modeling and optimization of energy system components equipped with phase change materials}, DOI={<a href=\"https://doi.org/10.17619/UNIPB/1-2199\">10.17619/UNIPB/1-2199</a>}, author={Grabo, Matti}, year={2025} }"},"place":"Paderborn","year":"2025","date_created":"2025-04-02T09:25:58Z","supervisor":[{"last_name":"Kenig","id":"665","full_name":"Kenig, Eugeny","first_name":"Eugeny"}],"author":[{"full_name":"Grabo, Matti","id":"66520","last_name":"Grabo","first_name":"Matti"}],"date_updated":"2025-04-02T09:44:05Z","doi":"10.17619/UNIPB/1-2199","title":"Modeling and optimization of energy system components equipped with phase change materials"},{"abstract":[{"text":"Within the current energy and environmental crisis, new material- and energy-saving processes are needed. For this reason, this study focuses on the development of a new forming technology for Ti-6Al-4V sheet metal. It is based on combination of solution treatment by resistive heating with rapid tool-based quenching and subsequent annealing. This new “TISTRAQ” process is comparable with press-hardening already known for steels and hot die quenching known for aluminium alloys. One of the main influencing factors for this process is the heat transfer coefficient (HTC). It is an important driver for adjustment of basic parameters, as selection of tool material or the forming speed but also plays an important role while elaborating temperature distribution in the numerical model. Therefore, a new and unique test rig was developed to determine the HTC and to perform tool-based heat treatment at specimen level under laboratory conditions. The test rig was used to investigate the influence of the titanium-tool-lubricant system on HTC and cooling rate. Further the effect of heat treatment in the test rig and tool-based quenching on microstructure and mechanical properties was studied. To improve the prediction of the temperature distribution of the titanium during cooling, the HTC was integrated into the numerical process simulation","lang":"eng"}],"status":"public","type":"conference","publication":"IOM3. Chapter 14: Forming, Machining & Joining [version 1; not peer reviewed]","keyword":["Interfacial heat transfer coefficient","Ti-6Al-4V","nonisothermal forming","thermomechanical processing","TISTRAQ process"],"language":[{"iso":"eng"}],"_id":"49430","user_id":"72351","department":[{"_id":"9"},{"_id":"321"},{"_id":"149"}],"year":"2024","citation":{"apa":"Kaiser, M. A., Höschen, F., Pfeffer, N., Merten, M., Meyer, T., Marten, T., Rockicki, P., Höppel, H. W., &#38; Tröster, T. (2024). The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient and influence on cooling rates. <i>IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>. 15th World Conference on Titanium, Edinburgh. <a href=\"https://doi.org/doi.org/10.7490/f1000research.1119929.1\">https://doi.org/doi.org/10.7490/f1000research.1119929.1</a>","mla":"Kaiser, Maximilian Alexander, et al. “The New TISTRAQ Process: Solution Treatment with Rapid Quenching and Annealing for Ti-6Al-4V Sheet Metal Part Forming - Investigation on Heat Transfer Coefficient and Influence on Cooling Rates.” <i>IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>, 2024, doi:<a href=\"https://doi.org/doi.org/10.7490/f1000research.1119929.1\">doi.org/10.7490/f1000research.1119929.1</a>.","short":"M.A. Kaiser, F. Höschen, N. Pfeffer, M. Merten, T. Meyer, T. Marten, P. Rockicki, H.W. Höppel, T. Tröster, in: IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed], 2024.","bibtex":"@inproceedings{Kaiser_Höschen_Pfeffer_Merten_Meyer_Marten_Rockicki_Höppel_Tröster_2024, title={The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient and influence on cooling rates}, DOI={<a href=\"https://doi.org/doi.org/10.7490/f1000research.1119929.1\">doi.org/10.7490/f1000research.1119929.1</a>}, booktitle={IOM3. Chapter 14: Forming, Machining &#38; Joining [version 1; not peer reviewed]}, author={Kaiser, Maximilian Alexander and Höschen, Fabian and Pfeffer, Nina and Merten, Mathias and Meyer, Thomas and Marten, Thorsten and Rockicki, Pawel and Höppel, Heinz Werner and Tröster, Thomas}, year={2024} }","ama":"Kaiser MA, Höschen F, Pfeffer N, et al. The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient and influence on cooling rates. In: <i>IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>. ; 2024. doi:<a href=\"https://doi.org/doi.org/10.7490/f1000research.1119929.1\">doi.org/10.7490/f1000research.1119929.1</a>","ieee":"M. A. Kaiser <i>et al.</i>, “The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient and influence on cooling rates,” presented at the 15th World Conference on Titanium, Edinburgh, 2024, doi: <a href=\"https://doi.org/doi.org/10.7490/f1000research.1119929.1\">doi.org/10.7490/f1000research.1119929.1</a>.","chicago":"Kaiser, Maximilian Alexander, Fabian Höschen, Nina Pfeffer, Mathias Merten, Thomas Meyer, Thorsten Marten, Pawel Rockicki, Heinz Werner Höppel, and Thomas Tröster. “The New TISTRAQ Process: Solution Treatment with Rapid Quenching and Annealing for Ti-6Al-4V Sheet Metal Part Forming - Investigation on Heat Transfer Coefficient and Influence on Cooling Rates.” In <i>IOM3. Chapter 14: Forming, Machining &#38; Joining [Version 1; Not Peer Reviewed]</i>, 2024. <a href=\"https://doi.org/doi.org/10.7490/f1000research.1119929.1\">https://doi.org/doi.org/10.7490/f1000research.1119929.1</a>."},"publication_status":"published","quality_controlled":"1","title":"The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient and influence on cooling rates","conference":{"end_date":"2023-06-16","location":"Edinburgh","name":"15th World Conference on Titanium","start_date":"2023-06-12"},"doi":"doi.org/10.7490/f1000research.1119929.1","date_updated":"2025-05-19T11:46:47Z","date_created":"2023-12-04T10:00:21Z","author":[{"last_name":"Kaiser","orcid":"0009-0008-1333-3396","id":"72351","full_name":"Kaiser, Maximilian Alexander","first_name":"Maximilian Alexander"},{"full_name":"Höschen, Fabian","last_name":"Höschen","first_name":"Fabian"},{"last_name":"Pfeffer","full_name":"Pfeffer, Nina","first_name":"Nina"},{"first_name":"Mathias","full_name":"Merten, Mathias","last_name":"Merten"},{"full_name":"Meyer, Thomas","last_name":"Meyer","first_name":"Thomas"},{"first_name":"Thorsten","id":"338","full_name":"Marten, Thorsten","last_name":"Marten","orcid":"0009-0001-6433-7839"},{"first_name":"Pawel","full_name":"Rockicki, Pawel","last_name":"Rockicki"},{"full_name":"Höppel, Heinz Werner","last_name":"Höppel","first_name":"Heinz Werner"},{"first_name":"Thomas","full_name":"Tröster, Thomas","id":"553","last_name":"Tröster"}]},{"year":"2022","citation":{"ieee":"M. A. Kaiser <i>et al.</i>, “ Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy,” presented at the Titanium USA 2022 Conference , Orlando, 2022.","chicago":"Kaiser, Maximilian Alexander, Pawel Rockicki, Fabian Höschen, Jan-Niklas Wesendahl, Stefan Konrad, Thomas Meyer, Thorsten Marten, and Thomas Tröster. “ Heat Transfer Coefficient Investigation for Hot Die Quenching Process of Ti-6Al-4V Alloy,” 2022.","ama":"Kaiser MA, Rockicki P, Höschen F, et al.  Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy. In: ; 2022.","short":"M.A. Kaiser, P. Rockicki, F. Höschen, J.-N. Wesendahl, S. Konrad, T. Meyer, T. Marten, T. Tröster, in: 2022.","bibtex":"@inproceedings{Kaiser_Rockicki_Höschen_Wesendahl_Konrad_Meyer_Marten_Tröster_2022, title={ Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy}, author={Kaiser, Maximilian Alexander and Rockicki, Pawel and Höschen, Fabian and Wesendahl, Jan-Niklas and Konrad, Stefan and Meyer, Thomas and Marten, Thorsten and Tröster, Thomas}, year={2022} }","mla":"Kaiser, Maximilian Alexander, et al. <i> Heat Transfer Coefficient Investigation for Hot Die Quenching Process of Ti-6Al-4V Alloy</i>. 2022.","apa":"Kaiser, M. A., Rockicki, P., Höschen, F., Wesendahl, J.-N., Konrad, S., Meyer, T., Marten, T., &#38; Tröster, T. (2022). <i> Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy</i>. Titanium USA 2022 Conference , Orlando."},"date_updated":"2025-05-19T11:46:03Z","author":[{"first_name":"Maximilian Alexander","orcid":"0009-0008-1333-3396","last_name":"Kaiser","id":"72351","full_name":"Kaiser, Maximilian Alexander"},{"full_name":"Rockicki, Pawel","last_name":"Rockicki","first_name":"Pawel"},{"first_name":"Fabian","full_name":"Höschen, Fabian","last_name":"Höschen"},{"last_name":"Wesendahl","full_name":"Wesendahl, Jan-Niklas","first_name":"Jan-Niklas"},{"full_name":"Konrad, Stefan","last_name":"Konrad","first_name":"Stefan"},{"last_name":"Meyer","full_name":"Meyer, Thomas","first_name":"Thomas"},{"first_name":"Thorsten","full_name":"Marten, Thorsten","id":"338","orcid":"0009-0001-6433-7839","last_name":"Marten"},{"id":"553","full_name":"Tröster, Thomas","last_name":"Tröster","first_name":"Thomas"}],"date_created":"2023-12-04T10:17:16Z","title":" Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy","conference":{"location":"Orlando","end_date":"2022-10-12","start_date":"2022-10-09","name":"Titanium USA 2022 Conference "},"type":"conference_abstract","status":"public","_id":"49433","user_id":"72351","department":[{"_id":"9"},{"_id":"321"},{"_id":"149"}],"keyword":["Ti-6Al-4V","heat transfer coefficient"],"language":[{"iso":"eng"}]}]