Effect of wall brightness on room illumination / Steven de Backer in COATINGS TECH, Vol. 16, N° 9 (09/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 9 (09/2019) . - p. 32-39 Titre : Effect of wall brightness on room illumination Type de document : texte imprimé Auteurs : Steven de Backer, Auteur ; Michael P. Diebold, Auteur ; M. P. Milone, Auteur Année de publication : 2019 Article en page(s) : p. 32-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Blanc (couleur) Eclairage Etudes comparatives Gris (couleur) Luminosité Mesure Modèles numériques Noir (couleur) Revêtements intérieurs:Peinture intérieure Index. décimale : 667.9 Revêtements et enduits Résumé : While there is an intuitive connection between wall brightness and the electrical demand for illuminating a room, there has been little data reported to quantify this relationship. Here, we report the relative electrical load needed to light a room at the 500 lux level specified by European lighting standard EN12464-1:2011, as a function of wall brightness. A room was painted white, black, and two intermediate shades of gray, and room brightness was measured at multiple locations and directions using four light levels (controlled with a light dimmer), for both warm and cool fluorescent bulbs. Results were compared to computer modeling. Based on these results, we determined the expected electrical requirements for rooms painted with over a dozen "colors of the year," as designated by major décor coatings manufacturers. The results were compared to the electrical requirement for a white wall. Significant energy savings are possible when painting a dark wall white. Note de contenu : - Implications for paint consumers - Economic and environmental consequences - Comparison to white roof energy savings - Fig. 1 : Room dimensions and test locations - Fig. 2 : View of room, facing door. Room is painted black - Fig. 3 : Luminance values for four room colors, at four light luminosities, at the center of the room. Bars indicate one standard deviation - Fig. 4 : Energy requirements for the four combinations of location and orientation, as a function of wall color, required to meet a given luminance value. Data is relative to the energy requirement for the brightest wall - Fig. 5 : Comparison of measured and calculated energy requirements for two locations, as a function of wall color, required to meet a given luminance value. Experimental : filled circles and dashed lines ; calculated : open circles and solid lines. Data is relative to the energy requirement for the brightest wall - Fig. 6 : Brightnesses of "color of the year" paints, overlaid on the experimental results - Table 1 : Measured energy requirements for different locations and orientations, relative to the requirements for a white room - Table 2 : Calculated requirements for different locations and orientations, relative to the requirements for a white room - Table 3 : Comparison of experimental and calculated electricity requirements to match the brihtness of a room with white walls - Table 4 : Brightness and energy requirements of various "colors of the year" - Table 5 : Cost and environmental comparison of black and white room En ligne : https://drive.google.com/file/d/1THrGZFVtKyxlL8tKGJ6p-pKQxTJ-ScKi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32995 [article]

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