Paper Conference

Proceedings of uSim Conference 2020: 2nd uSim Conference of IBPSA-Scotland


Thermally activated building systems for nearly zero energy communities: Influence of the solar thermal heat generation

Tillman Gauer, Matthias Pahn

Abstract: To achieve national and international climate goals, also the greenhouse gas emissions from the building sector must be reduced. One option is the use of renewable energies, which must be stored. Thermally activated building parts (TABS), e.g. solid concrete walls with integrated capillary tubes, are a potential heat storage. In order to investigate the potential for electric demand side management a representative dwelling, equipped with an electric heat pump, a solar thermal collector and TABS is used to investigate the influence of size and orientation of the solar thermal collector. It was found that the orientation of the collector is a major driver, as expected, but also unfavourable orientations, to the West and East, still lead to a significant use of solar thermal heat. Increasing sizes of the solar thermal collector also lead to reduced electric demands, but with a clearly asymptotic behaviour. The potential for demand side management is investigated using a time variant tariff, representing the time variant carbon intensity. The highest potentials can be found with the solar thermal collector oriented to the West and East. In contrast the southern orientation leads to a higher carbon tax. It was also shown that the distribution of the tariff is rather constant for the size and the orientation of the collector. Furthermore, a formula was derived to estimate the total annual electric demand of a building, depending on the size and orientation of the solar thermal collector.
Pages: 30 - 35