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Interactive Three-Dimensional Visualisation of Thermal Comfort

: Schöffel, F.; Herkel, S.; Dionisio, J.

Nakahara, N. ; International Building Performance Simulation Association -IBPSA-:
Proceedings of Building Simulation '99. Vol.1
S.l., 1999
ISBN: 4-931416-01-2
International Building Performance Simulation Association (International Conference) <6, 1999, Kyoto>
Conference Paper
Fraunhofer IGD ()
Fraunhofer ISE ()
3D visualisation; Thermal simulation; Thermal comfort; radiosity

For improving feedback about thermal simulation results from engineers to architects, it is desirable to present them in the three-dimensional context of the building. In this paper, we present a system for improved thermal simulation and interactive 3D visualisation of the results. We describe extensions of the physically-based rendering system GENESIS-2 towards: interactive reduction of complex CAD-models for use in building simulation (tesselation/decimation techniques); calculation of thermal comfort; user-friendly interfaces for results exchange and their display within interactive Virtual Environments. A highlight goes to the fact that the reduced thermal model is exported in STEP language, following a new technical notice of the German Engineers Society (VDI) 6021 "Data Exchange for Thermal Load Simulations". Also, radiation onto walls is simulated by the radiosity method within GENESIS-2. The thermal simulations are then performed by TRNSYS, using an import filter for VDI 6021.
The results of this simulation are transferred back to the GENESIS-2 system, where the thermal comfort is calculated according to Fanger's rule. Finally, the simulation results are visualised in the context of the original CAD-model of the building, enabling the user to interactively walk through the building and examine in real-time the simulated results. Thus, location-dependent comfort temperatures can be displayed even with a single zone model.