Calculating solar irradiance without shading geometry: a point cloud-based method. Issue 5 (3rd September 2021)

• Record Type: Journal Article
• Authors: Bognár, Á.; Loonen, R.C.G.M.; Hensen, J.L.M.
• Is Part Of: Journal of building performance simulation. Volume 14:Issue 5(2021)
• Page Start: 480
• Page End: 502
• Publication Date: 2021-09-03
• Subjects: Solar irradiance -- photovoltaics -- solar heat gains -- shading; 690.0113
• DOI: 10.1080/19401493.2021.1971765
• Languages: English
• ISSNs: 1940-1493

Abstract

Abstract : Accurate simulation of solar irradiance on facades and roofs in a built environment is a critical step for determining photovoltaic yield and solar gains of buildings, which in an urban setting are often affected by the surroundings. In this paper, a new modelling method is introduced that uses Digital Surface Model (DSM) point clouds as shading geometry, combined with a matrix-based approach for simulating solar irradiance. The proposed method uses the DSM as shading geometry directly, eliminating the need for 3D surface geometry generation and conducting ray-tracing, thus simplifying the simulation workflow. The real-world applicability is demonstrated with two case studies, where it is shown that if the site is shaded, ignoring the shading from the surroundings would cause overprediction in the simulated annual PV yield, underprediction of the annual heating and overprediction of the annual cooling demand.