Publication

Influence of indoor temperature and daylight illuminance on visual perception

Résumé

This paper details the results of an experimental study investigating the combined effect of indoor temperature (19 ℃, 23 ℃ and 27 ℃) and horizontal illuminances (∼140 lx, ∼610 lx and ∼1440 lx) on visual perception, with daylight as the only source of light. The goal is to evaluate the cross-modal effect of temperature and the unimodal effect of daylight illuminances on the visual perception of daylight. A 3 × 3 mixed-design experiment was conducted in an office-like test room with 84 participants. Results show that cross-modal effects of indoor temperature on visual perception occurred: Temperature influenced the perceived warmth of daylight, and temperature interacted with daylight illuminance as the high illuminance was considered more pleasant, was better evaluated and was more often chosen than the low one only in a thermally comfortable condition. In terms of unimodal effects, differences in visual comfort evaluations were substantial only between the low and the other two illuminances, suggesting that visual comfort did not increase with illuminance above an already comfortable threshold. Moreover, perceived brightness under the high daylight illuminance was lower than that reported in past studies under a comparable electric light illuminance, leading to the hypothesis that high illuminances might be more tolerated in a naturally-lit environment compared to a space illuminated with electric light. Findings advance the understanding of occupant perceptions of daylit environments and suggest that, together with visual factors, thermal conditions should be considered in visual perception investigations.

À propos de ce résultat
Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.
Concepts associés (34)
Daylighting
Daylighting is the practice of placing windows, skylights, other openings, and reflective surfaces so that direct or indirect sunlight can provide effective internal lighting. Particular attention is given to daylighting while designing a building when the aim is to maximize visual comfort or to reduce energy use. Energy savings can be achieved from the reduced use of artificial (electric) lighting or from passive solar heating.
Perception
La perception est l'activité par laquelle un sujet fait l'expérience d'objets ou de propriétés présents dans son environnement. Cette activité repose habituellement sur des informations fournies par ses sens. Chez l'espèce humaine, la perception est aussi liée aux mécanismes de cognition. Le mot « perception » désigne : soit le processus de recueil et de traitement de l'information sensorielle ou sensible (en psychologie cognitive par exemple) ; soit la prise de conscience qui en résulte (en philosophie de la perception notamment).
Confort thermique
thumb|Bivouac dans un sac de couchage très isolant. Malgré le froid, le dormeur dort confortablement. La notion de confort thermique est le plus souvent appliquée à l'être humain, bien qu'elle puisse s'appliquer à tout être vivant. En effet, la vie - et spécialement l'activité métabolique assurant les fonctions vitales - n'est possible que dans une certaine plage de température, qui varie d'une espèce à l'autre. Il existe cependant des conditions d'ambiance optimales qui seront ressenties par l'individu comme celle d'un état de confort thermique.
Afficher plus
Publications associées (36)

Discomfort glare from daylight: Influence of transmitted color and the eye's macular pigment

Marilyne Andersen, Jan Wienold, Sneha Jain

Designing architectural façades that allow sufficient daylight to create visually comfortable and pleasant envi- ronments is a challenging aspect of building design as it requires to account for visual comfort and discomfort glare risks, and understand the ...
2023

Discomfort glare from daylight: Influence of transmitted color and the eye's macular pigment

Sneha Jain

Designing architectural façades that allow sufficient daylight to create visually comfortable and pleasant environments is a challenging aspect of building design as it requires to account for visual comfort and discomfort glare risks, and understand the f ...
2023

Human needs vs. modern living expectations: a case for daylight access

Marilyne Andersen

Natural light greatly impacts how a building is experienced by its occupants. It affects their well-being, notably from their health and biological clock perspectives, but also their perceived visual and thermal comfort, or their emotional response. If we ...
2023
Afficher plus
MOOCs associés (2)
SES Swiss-Energyscope
La transition énergique suisse / Energiewende in der Schweiz
SES Swiss-Energyscope
La transition énergique suisse / Energiewende in der Schweiz