An image-based analysis of solar radiation for urban settings
conference contributionposted on 10.02.2020, 10:24 by John Mardaljevic, Mark Rylatt
This paper describes a novel approach for evaluating the total annual/monthly irradiance incident on building facades in urban settings. The analysis is founded on a physically-based rendering approach and uses datavisualisation techniques to generate ‘maps’ (i.e. false-colour images) of annual/monthly irradiance. The irradiance ‘maps’ are derived from hourly time-series data for one year and take accurate account of shading by, and inter-reflection from, other buildings and surfaces. The sun and sky irradiance are evaluated separately. The sky contribution is calculated using realistic, non-isotropic models for the sky radiance distribution. The ‘maps’ can be used to confidently identify facade-locations where there is high irradiance, for example to aid the siting of photo-voltaic panels. The technique can be applied to scenes of arbitrary complexity from a single building to fully ‘worked-up’ city models. The results of the analysis have been linked to a GIS-based solar energy planning system. The system is targeted at city planners and one of its aims is to encourage the consideration of solar energy in the urban planning process.
EPSRC grant GR/L05372
- Architecture, Building and Civil Engineering