Article: A novel method for calculating the light energy distribution in building space Journal: International Journal of Simulation and Process Modelling (IJSPM) 2020 Vol.15 No.4 pp.322 - 332 Abstract: In lighting design in buildings, the conventional algorithms may cause significant calculation error of light energy distribution and may not ensure illumination uniformity. In this paper, the radiation method in computer graphics is studied, combined with formula derivation, two kinds of light energy calculation methods based on Lambert reflection model and non-Lambert reflection model are investigated, and two models: model 1 and model 2, are established for interior space of non-uniform height and non-rectangular interior space respectively. Comparing simulation results of the models with existing models in a DIALux environment, the illumination uniformity calculation error of model 1 is 30%, and the calculation error of model 2 is within 5%. In addition, parameters of the models are modulated by experiments, in order to improve the accuracy of the models. Although model 1 based on Lambert's reflection model runs fast, its accuracy needs to be improved. In the case of high simulation accuracy of spatial light environment, model 2 based on the non-Lambert reflection model is the better choice. At the same time, it is proved that the improved radiation method is feasible in calculating the light energy of interior spaces with non-uniform height and non-rectangular shape. Inderscience Publishers - linking academia, business and industry through research

Title: A novel method for calculating the light energy distribution in building space

Authors: Jundong Fu; Qing Chen

Addresses: School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang, China ' School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang, China

Abstract: In lighting design in buildings, the conventional algorithms may cause significant calculation error of light energy distribution and may not ensure illumination uniformity. In this paper, the radiation method in computer graphics is studied, combined with formula derivation, two kinds of light energy calculation methods based on Lambert reflection model and non-Lambert reflection model are investigated, and two models: model 1 and model 2, are established for interior space of non-uniform height and non-rectangular interior space respectively. Comparing simulation results of the models with existing models in a DIALux environment, the illumination uniformity calculation error of model 1 is 30%, and the calculation error of model 2 is within 5%. In addition, parameters of the models are modulated by experiments, in order to improve the accuracy of the models. Although model 1 based on Lambert's reflection model runs fast, its accuracy needs to be improved. In the case of high simulation accuracy of spatial light environment, model 2 based on the non-Lambert reflection model is the better choice. At the same time, it is proved that the improved radiation method is feasible in calculating the light energy of interior spaces with non-uniform height and non-rectangular shape.

Keywords: illumination calculation; light energy distribution; radiosity; Lambert reflection; non-Lambert reflection; global illumination.

DOI: 10.1504/IJSPM.2020.110181

International Journal of Simulation and Process Modelling, 2020 Vol.15 No.4, pp.322 - 332

Received: 27 Feb 2019
Accepted: 25 Nov 2019
Published online: 08 Oct 2020 *

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Title: A novel method for calculating the light energy distribution in building space

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