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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Influence of nano-silica and polyethylene wax on the scratch behavior of acrylic-based polyurethane coatings / S. Y. Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1295-1303 Titre : Influence of nano-silica and polyethylene wax on the scratch behavior of acrylic-based polyurethane coatings Type de document : texte imprimé Auteurs : S. Y. Lee, Auteur ; W.-Y. Jung, Auteur ; J.-B. Shin, Auteur ; J.-I. Weon, Auteur Année de publication : 2019 Article en page(s) : p. 1295-1303 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse de dommages (matériaux) Brillance (optique) Cires Copolymère uréthane acrylique Essais (technologie) Luminosité Nanoparticules Polyéthylène Rayures Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Surfaces -- Analyse Index. décimale : 667.9 Revêtements et enduits Résumé : The scratch behavior and resistance of acrylic-based polyurethane coatings were studied. The effects of fumed silica and polyethylene wax were investigated using an area-contact scratch tip, which can apply a constant load to the coating surfaces at a relatively low stress level. Measurements of the normalized changes in gloss (%Gn) and luminance (%Ln) could be provided as reliable and meaningful methodologies for estimating the scratch resistance and subtle damage to polymeric coating surfaces. A higher gloss-valued coating surface has better scratch resistance. The addition of nano-silica particles provides the increases in hardness, transparency, and resistance to scratch damage for the acrylic-based polyurethane surface, whereas the polyethylene wax contributes to the increases in gloss and smoothness for the coating surface. The surface characteristics observed are responsible for the improved scratch performance of the acrylic-based polyurethane coating surface. Note de contenu : - EXPERIMENTAL : Materials - Scratch test methodology - Scratch damage analysis - Surface characterization - RESULTS AND DISCUSSION : Scratch behavior and analysis - FTIR analysis - XPS analysis DOI : 10.1007/s11998-019-00207-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00207-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33012 [article]

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