Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Speedup Potential of Climate-Based Daylight Modelling on GPUs

Nathaniel L Jones and Christoph F Reinhart
Massachusetts Institute of Technology, Cambridge, MA, USA

Abstract: Architects must consider an entire year's worth of solar positions and climate data to design buildings with adequate daylight and minimal glare. However, annual simulations are time-consuming and computationally expensive, which makes them difficult to integrate into iterative design processes. In this paper, we compare the performance of several RADIANCE-based dynamic daylighting simulation methods, DAYSIM and the three- and five-phase methods and, perhaps more importantly, the potential to speed them up using parallel implementations on graphic processors. Using a model of a generic office, we achieve speedups of ten times with DAYSIM and twenty-five times with the five-phase method. Parallel implementations of three- and five-phase methods provide better scaling to multi-GPU environments and more accurate results for complex fenestration systems than parallelized DAYSIM.
Pages: 975 - 984