Conference Paper
Proceedings of Building Simulation 2019: 16th Conference of IBPSA
On the Prediction of Ground-Reflected Solar Radiation and its Relevance in the Context of Building Performance Simulation (BPS)
On the Prediction of Ground-Reflected Solar Radiation and its Relevance in the Context of Building Performance Simulation (BPS)
Luminita Dumitrascu, Ian Beausoleil-MorrisonCarleton University, CanadaDOI: https://doi.org/10.26868/25222708.2019.210189Abstract: Establishing accurate ground reflectivity values is critical for the reliable prediction of ground-reflected solar radiation. It is common for building performance simulation users to employ the default values of ground reflectivity (0.2 for most simulation tools) which can lead to significant inaccuracies, especially for periods during which the ground is covered by snow. The paper provides an overview of existing models for predicting ground reflectivity, and then presents a new model suitable for implementation into BPS tools. Simulation results predicted with the new model are further compared with measurements. To quantify the influence of the new model, two sets of simulations were run with ESP-r to predict the solar irradiance incident on a south oriented façade and on a south oriented 60°-sloped surface. Comparing the predictions with measured data, it was noticed that the influence of the new model on predicted solar irradiance is higher for the vertical surface. Keywords: ground/snow reflectivity, empirical model, zenith angle, snow age, solar irradiance, predicted valuePages: 4754 - 4761 Paper: