Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Activation of the building thermal mass to store PV surplus energy

Arno Dentel, Christina Betzold
Technische Hochschule Nürnberg, Germany

Abstract: Since 2018, a terraced house complex with shared energy system is monitored and evaluated regarding PV selfconsumption and efficiency (Figure 3). Beside heat pumps and photovoltaics (PV), different kind of storage units are integrated and used to store PV surplus. Thermal storage units for heating and domestic hot water as well as an electrical storage are integrated into the higher-level control system and are charged selectively. However, since the capacity limits have been reached, additional storage options are interesting. The thermal mass of the building offers additional potential to store PV surplus energy. This paper evaluates the operation of thermal mass activation for the terraced house complex in order to increase the PV self-consumption and decrease the grid consumption. The simulation study of thermal mass activation is realized in TRNSYS. Increasing the room set point temperature of 20 °C by 2 K during PV production, aims to a reduction of the grid consumption by 47 % and an increase of PV self-sufficiency from 23 % up to 64 %. At the same time, the mean deviation of the room set temperature increased from 1.7 K to 2.0 K. The results are compared to real measured data from the terraced house.
Keywords: ZEB, thermal storage, building mass, model predictive control
Pages: 673 - 679