Fabian Wüllhorst

• Master of Science
• RWTH Aachen University

Due to the advance in energy engineering and necessary adaptations due to climate change, building energy systems are becoming increasingly complex, necessitating the development of advanced control strategies. However, there is often a gap between control algorithms developed in research and their practical adoption. To bridge this gap, we present...

The transformation process in the building sector towards future city concepts requires changes in our society that aim for significant emission reduction until 2045. Currently, buildings in Germany are constructed and operated in such a way that no changes need to be made to them for decades. Therefore, any upcoming changes that do not achieve the...

Modelica enables an object-oriented approach to model complex systems in product development and research, and, thus, the development of various model libraries. Library development requires collaborative development in a team of multiple developers. A typical challenge in collaborative development, especially in the area of open source, is to crea...

Towards the analysis and optimization of a coupled building energy sector, various component model libraries for hydraulic, ventilation, electrical, control, and building domains exist. However, no uniform open-source framework to couple these domains in a holistic building energy system simulation exists. Thus, we present BESMod, an open-source Mo...

Zur systematischen Elektrifizierung der Wärmebereitstellung nehmen Wärmepumpen zukünftig eine Schlüsselrolle ein. Daher müssen mehr Wärmepumpen entwickelt, in den Markt gebracht, verbaut und gewartet werden. Im Vergleich zu konventionellen Wärmeerzeugern ist die Wärmepumpe eine komplexere Anlage, sodass ein erhöhtes Systemverständnis notwendig ist....

Open-source modeling libraries facilitate the standardization and harmonization of model development. In the context of building energy systems, Modelica is a suitable modeling language as it is equation-based and object-oriented. As an outcome of the IBPSA project 1 cooperation, four open-source modeling libraries have been successfully deployed w...

Back-up heaters are essential for sustainable retrofit heat pump systems to achieve low capital costs and high system temperatures. Despite its importance, current literature focuses primarily on single aspects of the interaction between the back-up heater and the heat pump system. Furthermore, influences of varying scenarios are typically not cons...

Zusammenfassung Aufgrund des russischen Angriffs auf die Ukraine ist mit einer deutlichen Verknappung und weiteren Verteuerung des Erdgases in Deutsch-land zu rechnen. Neben der Industrie und dem Bereich Gewerbe, Handel und Dienstleistungen können die privaten Haushalte erhebliche Einsparungen im Gasverbrauch für Raumwärme und Trinkwarmwasser durch...

Vapor compression cycles have gained high importance due to increasing concerns regarding the decarbonization of heating and cooling applications. Typically, vapor compression cycles operate under dynamic conditions, making it difficult to predict their performance accurately. Dynamic simulation models present a decent solution for increasing the r...

Aiming for a sustainable building stock, air-source heat pump systems are a key technology. In residential application, heat pump systems typically consist of a heat pump, an auxiliary heater, two thermal storages (for space heating and domestic hot water), and a system controller. Compared to conventional technologies, the efficiency of a heat pum...

Vapour compression machines such as heat pumps and chillers are vital for achieving climate goals. Efficiency of both depend mostly on system integration. In order to simulate coupled energy systems, fast and stable simulation models are required. Hence, we implement an open-source model for reversible vapour compression machines. The black-box bas...

Conventional design methods oversize heat pump systems to ensure heat supply coverage. Oversizing might lead to efficiency losses due to part load operation and to high investment cost. To overcome those issues already in the design process, decisions on refrigerant, heat pump and system level must be made simultaneously. Based on process intensifi...

Die Defossilisierung der Gebäudeenergieversorgung durch die Integration erneuerbarer Energiequellen erfordert eine ganzheitliche Betrachtung der Versorgungssysteme, um deren Einbindung zuverlässig bewerten zu können. Zur zuverlässigen Bewertung und maximalen Ausschöpfung des ökologischen und ökonomischen Einsparpotentials der vornehmlich volatilen...

Heat pump systems are a key technology to replace conventional heating technologies such as gas-fired boilers towards a sustainable building sector. Especially in existing buildings, heat pump systems commonly consist of an air-source heat pump, an auxiliary heater and thermal energy storages. Compared to an almost constant energy efficiency of boi...

Um die Attraktivität der Wärmepumpe für die Anwendung in der Gebäudenachrüstung steigern zu können, ist eine verstärkte Betrachtung aller Ebenen des Wärmepumpensystems notwendig. Dabei haben verschiedene Faktoren unterschiedlichen Einfluss auf die Gesamteffizienz des Systems. https://www.tab.de/artikel/tab_Integrierte_Auslegung_3620539.html

Der Einsatz von Wärmepumpen forciert eine nachhaltige Wärmeversorgung des Gebäudesektors, da zukünf-tig mit Strom und Umweltwärme ressourcenschonende Energiequellen eingesetzt werden können. Aller-dings ist die Marktdurchdringung der Wärmepumpe durch hohe Investitionen gehindert. Konventionelle Auslegungen führen zu einer Überdimensionierung der Wä...