Light & Engineering 32 (4) 2024

Volume 32
Date of publication 08/15/2024
Pages 4–13

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Simulation of Daylight Glare Probability in Rooms with Grating Smart Windows L&E, Vol.32, No.4, 2024

Articles authors:

Rustam S. Zakirullin, Nikita M. Gunko, Irina A. Odenbakh

Rustam S. Zakirullin, Dr. of Technical Sciences, Associate Professor. He graduated from the Orenburg Polytechnic Institute in 1983. At present, he is Head of the Department “Heat and Gas Supply, Ventilation and Hydromechanics”, Orenburg State University, Counsellor of RAASN. His research interests are optics, daylighting, insolation and sun protection, smart windows, chromogenic, photovoltaic and thermoelectric materials, optimization of heat and mass transfer processes, metrology of laser radiation

Nikita M. Gunko graduated from the Orenburg State University in 2023. At present, he is a lecturer at the Department “Heat and Gas Supply, Ventilation and Hydromechanics”, Orenburg State University. His research interests are optics, daylighting, insolation and sun protection, smart windows, chromogenic materials, heat and gas supply and ventilation

Irina A. Odenbakh, Ph. D. of Pedagogical Sciences. She graduated from Orenburg State University in 2002. At present, she is Associate Professor at the Department “Heat and Gas Supply, Ventilation and Hydromechanics”, Orenburg State University. Her research interests are optics, daylighting, insolation and sun protection, smart windows, chromogenic materials, heat and gas supply and ventilation

Abstract:

Reducing the Daylight Glare Probability (DGP) is one of the important tasks of increasing the comfort of daylighting and insolation, especially in industrial and public premises with long stays of people during working hours. A method has been developed for modelling the DGP in a room with smart window with built-in grating optical filter having angular-selective light transmission. New equations have been obtained for calculating the diffuse light transmittance, vertical illuminance, and luminance in such rooms. Numerical simulation has been carried out to determine the parameters of the filter gratings, the temporal characteristics of light transmission, and to calculate the DGP at 12 points of the room. The proposed grating chromogenic smart window has minimal transmission at a designated time, in contrast to a conventional chromogenic smart window with a continuous surface coating and a conventional uncoated window, the transmittance of which changes only due to reflection and absorption losses depending on the incidence angle of the solar rays. The diffuse light transmittance of a grating chromogenic window is higher than that of a conventional chromogenic window in both coloured and bleached states, which increases daylight during months with insufficient solar radiation. The results of the DGP calculation showed that the best anti-glare performance is provided by the grating chromogenic smart window, intermediate by the conventional chromogenic smart window, and the worst by the conventional uncoated window. The developed method for modelling the glare probability is applicable to assess not only DGP, but also any other metrics of discomfort.

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Keywords

DOI: https://doi.org//10.33383/2024-006

Article in RUS:
Svetotekhnika # 3, 2024, pp. 19–27

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