Glazing type (colour and transmittance), daylighting, and human performances at a workspace: A full-scale experiment in Beijing

Chen, Xiaodong, Zhang, Xin and Du, Jiangtao ORCID: 0000-0002-4307-4398 (2019) Glazing type (colour and transmittance), daylighting, and human performances at a workspace: A full-scale experiment in Beijing. BUILDING AND ENVIRONMENT, 153. pp. 168-185.

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Official URL: http://dx.doi.org/10.1016/j.buildenv.2019.02.034

Abstract

This study presents a human experiment of effects of glazing types (colour and transmittance) on participants' alertness and mood, working performance, and self-reported satisfaction in a full-scale office in Beijing, China. Seven glazing systems were tested in a winter period (17th Nov 2017–15th Jan 2018). Research methods included lighting measurements, KSS (Karolinska Sleepiness Scale) sleepiness evaluation, PANAS (Positive and Negative Affect Schedule) mood survey, reaction time test (GO/NOGO), and self-reported questionnaires. Key findings are as follows: Circadian Stimulus (CS) can be used as an indicator of alertness and mood in a daylit workspace. If a higher CS level (≥0.3) can be achieved, glazing colour and transmittance would not significantly affect human's alertness and sleepiness. A low CS level (<0.3) would bring in significant negative mood to occupants. On the other hand, the improvement of occupants' mood would be achieved through increasing glazing visual transmittance and/or decreasing its colour saturation. Self-reported satisfactions show that a preference will be given to the glazing systems with neutral colour and/or higher transmittance in terms of visual performance. It is unknown why the glazing systems with a medium CCT of 4400 K or a higher CCT of 8100 K can deliver shorter response time (RT) and better working performance in a reaction time task. It would be necessary to carry on investigations into the human performances and light colour, especially under daylighting conditions.

Item Type:	Article
Uncontrolled Keywords:	Daylighting, Glazing colour and transmittance, Alertness and mood, Working performance, Self-reported satisfaction, Office, Beijing
Depositing User:	Symplectic Admin
Date Deposited:	09 Jul 2019 13:52
Last Modified:	19 Jan 2023 00:38
DOI:	10.1016/j.buildenv.2019.02.034
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3049248