Conference Editor

Jianshun Zhang; Edward Bogucz; Cliff Davidson; Elizabeth Krietmeyer

Keywords:

Daylight supply estimation, simplified calculation method, Daylight Factor, DIVA-for-Rhino simulations, EN15193-1 standard.

Location

Syracuse, NY

Event Website

http://ibpc2018.org/

Start Date

24-9-2018 1:30 PM

End Date

24-9-2018 3:00 PM

Description

This paper compares a simplified method to calculate the daylight factor and the annual daylight contribution in a space to the output of dynamic daylighting simulations. The simplified calculation method is the one implemented in the European Standard EN 15193 for the calculation of the energy demand for lighting in buildings, while the tool for dynamic simulations is Daysim (managed through DIVA-for-Rhino). The analysis was carried out by applying the two approaches to a reference office room, which was assumed to be located in different sites and having different window areas, with different orientations, both in the absence and in the presence of a mobile shade. The presence of an obstructing building was also considered. A total number of 108 cases was considered for the comparison. The results showed a very good correlation between the analytical method and the Daysim simulations to calculate the daylight factor (R2 =0.99, with an absolute average difference of 11%). The correlation was lower for the calculation of the annual daylight contribution (R2 =0.86, with an absolute average difference of 35%), due to the complexity of variables included (climate, orientation, presence of a moveable shade). Among the variables, the higher differences between the analytical and simulation results were observed for the climate and the absence/presence of a shade.

Comments

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DOI

https://doi.org/10.14305/ibpc.2018.ms-2.06

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

COinS
 
Sep 24th, 1:30 PM Sep 24th, 3:00 PM

Validation of the EN 15193:2017 calculation method to estimate the daylight supply in a building: comparison with dynamic climate-based simulations

Syracuse, NY

This paper compares a simplified method to calculate the daylight factor and the annual daylight contribution in a space to the output of dynamic daylighting simulations. The simplified calculation method is the one implemented in the European Standard EN 15193 for the calculation of the energy demand for lighting in buildings, while the tool for dynamic simulations is Daysim (managed through DIVA-for-Rhino). The analysis was carried out by applying the two approaches to a reference office room, which was assumed to be located in different sites and having different window areas, with different orientations, both in the absence and in the presence of a mobile shade. The presence of an obstructing building was also considered. A total number of 108 cases was considered for the comparison. The results showed a very good correlation between the analytical method and the Daysim simulations to calculate the daylight factor (R2 =0.99, with an absolute average difference of 11%). The correlation was lower for the calculation of the annual daylight contribution (R2 =0.86, with an absolute average difference of 35%), due to the complexity of variables included (climate, orientation, presence of a moveable shade). Among the variables, the higher differences between the analytical and simulation results were observed for the climate and the absence/presence of a shade.

https://surface.syr.edu/ibpc/2018/MS2/6

 

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