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Item type:Publication, Access status: with files , Untersuchung der Teillastfahrweise von Oxyfuel-Kraftwerken(2025); This PhD thesis investigates the part load behaviour of oxyfuel power plants. With simulations the behaviour of the overall process for part load is analysed using the example of a hard coal fired oxyfuel power plant. The thesis focuses on the influences of the major plant components air separation unit, steam generator, two variants of the flue gas treatment unit and ingress of air.Publicationtype: Doctoral Thesis26 27 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Developing and showcasing a method for choosing and comparing energy supply system modelling and optimisation software(2024); The Paris Agreement under the United Nations Framework Convention on Climate Change aims to reduce global greenhouse gas emissions, targeting a maximum 2-degree Celsius temperature increase this century. A key strategy involves increasing renewable energy share and storage capabilities within existing energy supply system infrastructures, necessitating major restructuring processes. Energy supply system modelling and optimisation software can facilitate these changes, which resulted in many commercial and open-source tools with varying backgrounds, objectives, and use cases. Researchers, engineers, and decision-makers face challenges in selecting the most appropriate software for specific purposes. Although structured comparisons of available options are valuable case and tool-specific nuances often only emerge during result analysis. The current literature lacks a comprehensive result-based approach for choosing energy supply system modelling and optimisation software. This thesis proposes a result-based Comparative Method for selecting and comparing energy supply system modelling and optimisation software, enabling systematic comparison centred on optimisation results. The Comparative Method encompasses a rigorous preselection phase, a modelling step, and a versatile, application-oriented result-analysis phase. In addition, an outside-of-this-method reusable structured procedure involving a graph-theory-inspired post-processing strategy for energy supply system models is proposed. To support the scientific community in terms of compiling result-based comparisons, several energy supply system model scenario combinations have been devised. These address modern energy infrastructure challenges and serve as a basis for generating result-based comparisons in subsequent research. In this work, the developed combinations are utilised during an extensive case study to compare four modern, highly capable free and open-source software tools and to illustrate the method's features and applicability. As part of this research, a free and open-source software framework, called Tessif, is developed to streamline the execution of the derived Comparative Method during the case study. Thereby, Tessif is designed to also generally assist in modelling energy supply systems and be applicable beyond the scope of this thesis. In conclusion, this work provides a comprehensive summary of insights on modelling and optimising energy supply systems, along with the associated software. It presents recommendations for prospective software users and outlines a set of core features for the advancement and development of future modelling tools.Publicationtype: Doctoral Thesis60 97 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Beitrag des Wärmesektors zur Reduzierung der CO2-Emissionen in Energiesystemen mit SektorenkopplungIn der vorliegenden Arbeit wird ein detailliertes Modell des deutschen Wärmesektors entwickelt. Ausgehend vom Basisjahr 2015 können Szenarien für die Transformation des Wärmesektors bis zum Zieljahr 2050 simuliert und untersucht werden. Für alle Ergebnisse wird dabei stets eine hohe regionale und zeitliche Auflösung erreicht. Weiterführend ist das Modell in ein Gesamtsystemmodell integriert, um die Auswirkungen der Entwicklung im Wärmesektor für das gekoppelte Energiesystem zu analysieren. Die Ergebnisse der betrachteten Szenarien zeigen, dass der Rückgang von Heizöl und Kohle als Energieträger zur Wärmeerzeugung bereits deutliche CO2-Emissionsminderungen hervorruft. Weiterhin wirkt sich ein hoher Grad der Elektrifizierung und besonders die damit verbundene Nutzung effizienter Wärmepumpen positiv auf den Rückgang der CO2-Emissionen aus. Jedoch wird nur bei sehr ambitionierten Entwicklungen im Wärmesektor der Zielkorridor der Bundesregierung in Bezug auf die CO2-Emissionsminderung erreicht, eine Weiterführung der aktuellen Trends ist unzureichend. Es zeigt sich zudem, dass der Ausbau der erneuerbaren Stromerzeugungskapazitäten nach dem Netzentwicklungsplan 2030 nicht ausreicht, wenn in den Sektoren Wärme und Verkehr der Strombedarf bedingt durch die Elektrifizierung stark ansteigt.Publicationtype: Doctoral Thesis201 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Vergleich von Power-to-X-Konzepten zur Sektorenkopplung bei hohen regenerativen AnteilenPublicationtype: Doctoral Thesis123 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Einfluss der Entwicklung im Mobilitätssektor auf Energiesysteme mit hoher fluktuierender EinspeisungPublicationtype: Doctoral Thesis147 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Modellierung und Simulation als Werkzeug zur Bewertung technischer Entwicklungsoptionen am Beispiel der GroßkraftwerkstechnikA methodology with a practical orientation is derived from experienced issues in the application of modelling and simulation. This methodology allows the simulation based comparative studies in terms of their replicability, comparability and modelling close to reality. It is used to investigate development options of utility sized power plants with regard to efficiency improvements and/or CO2 emission reductions. The study compares current state of the art hard coal fired and lignite fired steam power plants and their improvements by increasing steam parameters, lignite pre-dying as well as the application of CO2 capture by post combustion or oxyfuel technology. Furthermore, the impact of using different gas turbine models for natural gas fired combined cycle power plants are studied.Publicationtype: Doctoral Thesis473 2403 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Physikalische Modellierung einer Kohlemühle im Kontext der RegelleistungsbereitstellungPublicationtype: Doctoral Thesis107 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Bewertung und Vergleich von Konzepten der CO2-armen Zementklinkherstellung auf Basis von CCS-TechnologienPublicationtype: Doctoral Thesis116 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Modellierung und Optimierung des Kalina-Kreislaufs zur geothermischen StromerzeugungPublicationtype: Doctoral Thesis109 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , 107