Paper Conference

Proceedings of BauSim Conference 2022: 9th Conference of IBPSA-Germany and Austria

   

ADVANCED RAYTRACING METHODS FOR MODELING SOLAR RADIATION O N OCCUPANTS IN BUILDINGS

Ganji Abolfazl, Sarith Kheybari, Sabine Subramaniam, Hoffmann Hoffmann

DOI: https://doi.org/10.26868/29761662.2022.1
Abstract: Incident solar radiation has a significant impact on thermal comfort in buildings, especially at (work) places where occupants are located close to large windows. While several approaches have been investigated for specular glazing, there is a lack of methods to consider the impact of solar radiation through complex fenestration systems (CFS), e.g. venetian blinds or louvers. In this paper, two raytracing simulation workflows in Radiance software are introduced: a) the Daylight Coefficient method (DC-method) and b) the 3-phase method. Both methods are capable of handling the detailed 3D geometry of room, shading system and a virtual human being to calculate the solar load on the occupant. While the DC-method represents a very accurate method, the 3-phase method is faster for simulating annual solar gain through complex fenestration systems (CFS) because it uses bidirectional scattering distribution functions (BSDF).