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Optical characterization of fritted glass for architectural applications
Environmental Energy Technology Division, Lawrence Berkeley National Laboratory.
Environmental Energy Technology Division, Lawrence Berkeley National Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Environmental Energy Technology Division, Lawrence Berkeley National Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2009 (English)In: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 31, no 6, 949-958 p.Article in journal (Refereed) Published
Abstract [en]

Fritted glass is commonly used as a light diffusing element in modern buildings. Traditionally it has been used for aesthetic purposes but it can also be used for energy savings by incorporating it in novel daylighting systems? To answer such questions the light scattering properties must be properly characterized.

This paper contains measurements of different varieties of fritted glass, ranging from the simplest direct-hemispherical measurements to angle-resolved goniometer measurements. Modeling the light scattering to obtain the full bidirectional scattering distribution function (BSDF) extends the measured data, making it useful in simulation programs such as Window 6 and Radiance. Surface profilometry results and SEM micrographs are included to demonstrate the surface properties of the samples studied.

Place, publisher, year, edition, pages
2009. Vol. 31, no 6, 949-958 p.
Keyword [en]
Fritted glass, Light scattering, Integrating sphere, BTDF, BRDF
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-110713DOI: 10.1016/j.optmat.2008.10.050ISI: 000265325400034OAI: oai:DiVA.org:uu-110713DiVA: diva2:278017
Available from: 2009-11-23 Created: 2009-11-23 Last updated: 2016-04-14Bibliographically approved
In thesis
1. Optical Characterization and Energy Simulation of Glazing for High-Performance Windows
Open this publication in new window or tab >>Optical Characterization and Energy Simulation of Glazing for High-Performance Windows
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Optisk karakterisering och energisimulering av smarta fönster
Abstract [en]

This thesis focuses on one important component of the energy system - the window. Windows are installed in buildings mainly to create visual contact with the surroundings and to let in daylight, and should also be heat and sound insulating. This thesis covers four important aspects of windows: antireflection and switchable coatings, energy simulations and optical measurements.

Energy simulations have been used to compare different windows and also to estimate the performance of smart or switchable windows, whose transmittance can be regulated. The results from this thesis show the potential of the emerging technology of smart windows, not only from a daylight and an energy perspective, but also for comfort and well-being. The importance of a well functioning control system for such windows, is pointed out.

To fulfill all requirements of modern windows, they often have two or more panes. Each glass surface leads to reflection of light and therefore less daylight is transmitted. It is therefore of interest to find ways to increase the transmittance. In this thesis antireflection coatings, similar to those found on eye-glasses and LCD screens, have been investigated. For large area applications such as windows, it is necessary to use techniques which can easily be adapted to large scale manufacturing at low cost. Such a technique is dip-coating in a sol-gel of porous silica. Antireflection coatings have been deposited on glass and plastic materials to study both visual and energy performance and it has been shown that antireflection coatings increase the transmittance of windows without negatively affecting the thermal insulation and the energy efficiency.

Optical measurements are important for quantifying product properties for comparisons and evaluations. It is important that new measurement routines are simple and applicable to standard commercial instruments. Different systematic error sources for optical measurements of patterned light diffusing samples using spectrophotometers with integrating spheres have been investigated and some suggestions are made for how to avoid such errors.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 77 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 692
Keyword
energy simulations, antireflection coatings, dip-coating, optical measurements, spectrophotometer, integrating spheres, low-e windows, solar control windows, smart windows, control strategies, U value, g-value
National Category
Other Engineering and Technologies
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-110716 (URN)978-91-554-7667-0 (ISBN)
Public defence
2010-01-08, Polhemssalen, Ångström Laboratory, Uppsala University, 10:15 (English)
Opponent
Supervisors
Available from: 2009-12-17 Created: 2009-11-23 Last updated: 2009-12-17Bibliographically approved

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Nilsson, AnnicaJonsson, AndreasRoos, Arne

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