EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 5CV.3.10 Fast and High-Resolution Calculation of Roof-Top and Façade PV Potentials Using GPU-Accelerated Ray Tracing
Type: Visual
Date: Wednesday, 8th September 2021
15:15 - 16:45
Author(s): D. Bredemeier, E. Rott, C. Schinke, T. Gewohn, H. Wagner-Mohnsen, R. Niepelt, R. Brendel
Presenter / Speaker: D. Bredemeier, Leibniz University of Hannover, Hannover, Germany
Event: Conference Conference
Session: 5CV.3 PV Systems: Planning, Plant Optimisation Tools, Advanced Installation Criteria, Construction Issues / Concentrators and PV for S
Topic: 5. 2 Design and Installation of PV Systems
Summary / Abstract: Climate change demands a rapid transition of the energy system towards renewable energy sources. Low levelized costs of electricity and a wide range of integration options combined with high modularity makes photovoltaic energy generation a key technology in this transition. Accurate and at the same time fast and scalable methods for estimating the yield of roof-top and façade PV systems are crucial for identifying the overall PV installation potential and the best locations for PV installations with respect to the energy yield. Within this contribution, we implement a graphics processor accelerated monte-carlo raytracing algorithm for the calculation of the energy yield of both roof-top and façade PV systems with high spatial and temporal resolution. Our algorithm works on geodata supplied in the open CityGML format which are widely available from official sources [1, 2]. Since our algorithm is highly parallelized, it can be applied to large scales within reasonable computation time while maintaining the high resolution. Figure 1 shows the calculated irradiance relative to the direct horizontal irradiance for a sample area (≈ 250 × 250 m²) in the city of Hanover (Germany). The calculation of figure 1 takes ≈ 1 hour on a single graphics card with 108 rays while including up to two reflection iterations. We are confident that the computation time can be reduced down to ≈ 20 minutes. Furthermore, by the time of the conference we will have implemented diffuse radiation from the sky. Finally, the PV energy yields are calculated based on the irradiance values using the software package pvlib [3]. Thus, our algorithm is a powerful tool for the evaluation and planning of PV installations on rooftops and façades especially in urban environments.