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Buildings 2018, 8(12), 171; https://doi.org/10.3390/buildings8120171

A Simplified Approach for the Annual and Spatial Evaluation of the Comfort Classes of Daylight Glare Using Vertical Illuminances

Technology Energy Building Environment (TEBE) Research Group, Department of Energy “Galileo Ferraris”, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy
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Received: 20 September 2018 / Revised: 27 November 2018 / Accepted: 30 November 2018 / Published: 5 December 2018
(This article belongs to the Special Issue Advances in Discomfort Glare Research)
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Abstract

A simplified approach to calculate the daylight glare comfort class (imperceptible, perceptible, disturbing, or intolerable glare) on annual basis and for a grid of points in a space is presented. This method relies on the calculation of the vertical illuminance (Ev) for each grid point only, which is compared to an Ev threshold value for each daylight glare comfort class. These Ev threshold values are determined through a comparison with the Daylight Glare Probability (DGP) values on an annual basis through a fault-detection technique, for a reduced number of points. Compared to an annual calculation of exact DGP values on a certain grid, this approach is able to evaluate the daylight glare comfort classes only, but it is less time consuming. The paper presents and critically discusses this simplified method by means of its application to different case-studies: south and west oriented office in Turin (Lat 45.1° N), in which the DGP is assessed for three points in the space, considering glazing with different transmission properties (specular or scattering) and visible transmittances, as well as three operable internal shading systems (one venetian blinds and two roller blinds, for solar or glare control). For the presented case studies, the average error in the classification of the space according to daylight glare comfort classes is below 5% when comparing this simplified approach to related DGP values. View Full-Text
Keywords: daylight glare comfort classes; glare spatial assessment; annual daylight simulation; simplified glare evaluation; fault-detection analysis; eye vertical illuminance; daylight glare assessment daylight glare comfort classes; glare spatial assessment; annual daylight simulation; simplified glare evaluation; fault-detection analysis; eye vertical illuminance; daylight glare assessment
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Giovannini, L.; Favoino, F.; Lo Verso, V.R.M.; Pellegrino, A.; Serra, V. A Simplified Approach for the Annual and Spatial Evaluation of the Comfort Classes of Daylight Glare Using Vertical Illuminances. Buildings 2018, 8, 171.

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