Experimental characterization of the color rendering properties of transparent monolithic aerogel. (15th July 2020)

• Record Type: Journal Article
• Authors: Buratti, C.; Belloni, E.; Merli, F.; Bianconi, F.
• Is Part Of: Solar energy. Volume 205(2020)
• Page Start: 183
• Page End: 191
• Publication Date: 2020-07-15
• Subjects: Monolithic aerogel -- Colour rendering -- CIE Lab coordinates -- RGB coordinates -- Colour shift; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2020.05.046
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: The color rendering properties of monolithic aerogel samples were investigated. Monolithic panes were fabricated by a rapid supercritical extraction method. An illuminator and a chroma-meter were used for the CIE Lab coordinates evaluation. The presence of aerogel tends to shift all the colors towards a blue hue. The calculated Color Rendering Index is equal to 85 for the monolithic samples. Abstract: Transparent elements of buildings account for most of the variation in the spectrum of transmitted daylight. This behavior has a considerable impact on the luminous quality of the indoor environment, because the light spectral composition affects the perceived color and brightness of the illuminated objects. As a consequence, the effect of light colour and intensity on the behavior and health of the occupants is very important. Among the innovative transparent solutions for buildings, monolithic aerogel is one of the most promising, both in terms of lighting and thermal performance. In this context, the present study investigates the colour rendering properties of monolithic aerogel. For the analysis we employed a machine vision system based on a dome-shape illuminator, a digital camera, a chroma meter, and a colour checker. We evaluated the effect of the aerogel on colour rendering by measuring the RGB and CIE Lab coordinates of the reference colours of the colour checker with and without the aerogel. The results show that, in general, the presence of aerogel tends to shift all the colours towards a blue hue, the maximum variations occurring with dark tones of red, yellow, and green. Finally the Colour Rendering Index Ra was calculated for the examined monolithic aerogel by means of a methodology developed in accordance to the EN ISO 410 standard and CIE standard procedures. The obtained values prove a rather good visual quality of the monolithic aerogel (Ra = 85).