Master's Thesis Sascha Behrendt


Experimental investigation of the flexibility of the technical building system in the E.ON ERC main building

The electrical grid is subjected to fluctuations due to the increasing renewable energy capacity.
To address this challenge, it is necessary to expand its control possibilities. Because of the high
electricity consumption in buildings, it is useful to regulate it. Therefore, potentials must be identified
and their benefit has to be quantified. The possibilities to regulate the power consumption
of buildings are defined with the termflexibility.
In this master thesis, the flexibility of the technical building system in the main building of the
E.ON Energy Research Center in Aachen is investigated. Due to many energy conversion plants,
the network of the building is complex and there are different boundary conditions that need to
be analysed.
The building is operated by a mode-dependent control. Hence, the focus of this thesis lies on the
differentmodes, in which some building components can be controlled in various combinations.
The electricity consumption of the technical building system depends on the chosen mode. Furthermore,
air-handling units, air humidifiers and a cogeneration unit are analysed and the impacts
on the thermal comfort in the building are briefly outlined.
The results show the time-dependent potential of flexibility in the building, because the power
consumption changes depending on the modes. The analysis of the mode-independent components
illustrates that they can provide further potential. However, there are weaknesses in the
control that should be improved to utilize their potential.
Based on the examinations of the current building operation, new modes are developed to extend
the flexibility in the building. Additionally, a forecasting script is worked out to determine the present
potential for flexibility. Furthermore, controlling possibilities are included which can be used
to apply themodes and the components for flexibility.
Finally, problems in the building operation are revealed which hamper the quantification of the
flexibility orwhich influence the flexibility potential in general. The analysis shows that some challenges
are only recognized during the real application and it is necessary to continue research to
forecast the flexibility in complex buildings.