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Publications (18)
To reduce the energy consumption of building energy systems, efficient and well-tuned control strategies are needed. However, developing and benchmarking control strategies is a challenging task. Here, simulation-based controller tuning and testing is beneficial and more cost-efficient compared to experiments. However, generating a model for this p...
Pumps supply central air handing units (AHU) with thermal energy via hydronic networks. They usually operate on the constant speed of their design point, are not controllable and therefore consume more electric energy than necessary. In order to reduce the energy consumption of those pumps, we built a testing facility with controllable pumps and in...
In many urban contexts, energy systems are undergoing fundamental change towards more interconnected system layouts. Appropriate planning tools are necessary to guide this transition towards more energy efficient system designs. Thus, the aim of this paper is to present workflow automation approaches to model buildings and district energy systems f...
In Gebäuden wird der Energietransport zwischen Wärme-/Kälteerzeugern und der Übergabe an die Verbraucher meist durch hydraulische Systeme sichergestellt. Bis vor wenigen Jahren waren diese Systeme oft homogen und einfach aufgebaut (z.B. Heizkessel in Kombination mit Radiatoren). Heutige Systeme werden immer komplexer. Sie zeichnen sich durch eine K...
RWTH Aachen University operates an own district energy system (DES), consisting of a district heating (DHS) and a district cooling system (DCS), which provide the Campus Melaten with thermal energy. In the near future a significant decrease of heat demand is expected. This results in a reorganisation of the DES, involving a development of new energ...
Low Order Models (LOM) for thermal building simulations on urban scale exist in parallel to extensively used Higher Order Models (HOM) for thermal simulations of single buildings. However, a comparison of a HOM in IDA-ICE and a LOM in Dymola revealed optimization potential regarding heat conduction through windows and indoor radiation exchange for...
There are different options for modelling indoor and outdoor long-wave radiation exchange in thermal building models for simulations at urban scale. For improving these building models, a good trade-off between accuracy and simulation time is a major challenge. To evaluate different radiation models for thermal network building models, we compared...
Dynamic building models can be a valuable part of integral energy system models at city district or urban scale, if parameterization and computation times do not exceed a practical limit. Low order thermal network models are able to represent a thermal zone by thermal resistances and capacitances with low computational costs. Yet, the widely used f...
The availability of input data and appropriate computing times are two major challenges when simulating entire city districts. For dynamic heat demand simulations, we contribute to these tasks by developing an integral tool chain. To reduce the amount of input data, we automatically create typical datasets of building setups for office buildings ac...
In the context of district energy systems, changes in a building's heat demand also affect the energy efficiency of the whole district heating network. We present an integral dynamic model of a district heating network branch with three buildings. By comparing simulations of a reference case and a retrofit scenario we show that reducing the buildin...