UV-Ray Filtering Capability of Transparent Glazing Materials for Built Environments

Abstract

In terms of lighting for the built environment, both providing healthy light and eliminating harmful components of light are the key factors for consolidation and for health promotion. The ingredients of daylight are exceedingly complicated and are classified by the wavelength of light. Ultraviolet (UV) light, wavelength between 400 nm-10 nm, is more energetic and will penetrate more readily through obstacles than visible light. In spite of all their positive uses, UV rays are very harmful for anyone who spends a large amount of time in the sun without proper protection. Glass and film manufacturers produce optically functional glass panes to control UV and infrared rays of sunlight. In order to curb excessive penetration of UV rays, optically functional glasses have been proposed and the performance assessments of the glazed materials have been measured and reported in this paper. Various pair-glasses consisting of UV control glass and the conventional are manufactured and evaluated, providing the photometric data in terms of wavelength. In conclusion, UV protection glass is more effective in controlling UV rays of natural light. Obviously, clear glass treated with UV protection film would provide excellent control of UV penetration and a pair of clear and UV protection glass treated with UV protection film should be recommended; this achieves 96.7% UV protection performance from natural light.

Impact of the spectral and spatial properties of natural light on indoor gas-phase chemistry: Experimental and modeling study

“…The transmittances measured for windows installed on the first floor, that is, without film, have cutoffs comparable to some windows found in the literature like the solar control translucent Low‐e and self‐cleaning windows, studied by Sacht et al and low‐e and clear glass studied by Kim and Kim . The differences in cutoff transmittance and shapes of the transmittances are probably due to the diversity of the glazed assemblies (type of glass, coating, presence of films, etc.)…”

“…The light intensity strongly varies spatially within a room. Kim and Kim and Gandolfo et al used one instrument that was moved in the room while assuming that the outdoor lighting conditions did not change during the measurements at the different locations. During the MERMAID campaign, another approach was adopted: The spectrally resolved irradiance was measured at one position in the room by the LICOR and the variation within the room was mapped as integrated irradiance (from 400‐750 nm) with PAR sensors, a good correlation ( R 2 = 0.98) between integrated irradiance from 300 to 400 nm and 400 to 750 nm (from the data analysis of the spectra in Figure ) being observed.…”

“…Previous works report the influence of the window composition, the applied coatings, and the solar angle on the characteristics of the light transmitted by windows such as the cutoff wavelength of the windows and their transmittance. In some studies, more specifically dedicated to the evaluation of indoor photochemistry, the ratio of light irradiance between indoors and outdoors has been obtained in different buildings.…”

Spectral Characteristics of UV Light Existing in Indoor Visual Environment

“…In order to curb excessive penetration of UV rays, optically functional glasses have been proposed [9] and the performance of the glazed materials was reported.…”

“…Function glasses can reduce dramatically the transmitted amount of UV into the building. With an overhang or vertical fin, appropriate solar control is required to block direct sun into the interior [9]. Special attention should be given to avoid staying in sun; and patches in the floor should be provided such as in balconies and buffer spaces and these provisions can contribute to building more safe environments in buildings.…”