Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Annual simulation of outdoor thermal comfort with TRNSYS

Marion Hiller 1, Ata Chokhachian 2, Christian Frenzel 1, Pablo Arango 1, Wolfgang Kessling 1, Stefan Holst 1, Thomas Auer 3
1 Transsolar Energietechnik GmbH, Germany
2 Technische Universität München Lehrstuhl für Architekturinformatik
3 Technische Universität München Lehrstuhl für Gebäudetechnologie und klimagerechtes Bauen

Abstract: This paper presents the modelling enhancements of the multizone model of TRNSYS and its GUI TRNLizard for the dynamic evaluation of the thermal behaviour of outdoor urban spaces. The developed approaches for detailed radiation modelling based on surface discretization and raytracing in 3-dimensional space extended the capabilities of the thermal building model to consider interior and exterior vegetation volumes. For the implementation special care was taken to enable both, the application of empirical correlations/assumptions for a simplified and fast modelling as well as the integration/coupling to detailed simulation results from other domains such as vegetation models and CFD. The validation showed that the improvements were successfully integrated. A comparison with measured data is still pending. The urban space model has been applied to the Bordeauxplatz in Munich. The case study showed that dynamic annual simulation results like the frequency distribution of comfort conditions provide very useful information for urban planning.
Keywords: Outdoor thermal comfort, Urban simulation, UTCI, TRNSYS
Pages: 812 - 819