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Visual and energy performance of switchable windows with antireflection coatings
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2010 (English)In: Solar Energy, ISSN 0038-092X, Vol. 84, no 8, 1370-1375 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this project was to investigate how the visual appearance and energy performance of switchable or smart windows can be improved by using antireflective coatings. For this study clear float glass, low-e glass and electrochromic glass were treated with antireflection (AR) coatings. Such a coating considerably increases the transmittance of solar radiation in general and the visible transmittance in particular. For switchable glazing based on absorptive electrochromic layers in their dark state it is necessary to use a low-emissivity coating on the inner pane of a double glazed window in order to reject the absorbed heat. In principle all surfaces can be coated with AR coatings, and it was shown that a thin AR coating on the low-e surface neither influences the thermal emissivity nor the U-value of the glazing. The study showed that the use of AR coatings in switchable glazing significantly increases the light transmittance in the transparent state. It is believed that this is important for a high level of user acceptance of such windows.

Place, publisher, year, edition, pages
2010. Vol. 84, no 8, 1370-1375 p.
Keyword [en]
Anti-reflective coatings, Smart Windows, Energy simulations, Optical simulations
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
URN: urn:nbn:se:uu:diva-110708DOI: 10.1016/j.solener.2010.04.016ISI: 000280634000005OAI: oai:DiVA.org:uu-110708DiVA: diva2:278012
Uppdaterad från Accepted till Published 20101207Available from: 2009-11-23 Created: 2009-11-23 Last updated: 2010-12-07Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 692
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
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)
Available from: 2009-12-17 Created: 2009-11-23 Last updated: 2009-12-17Bibliographically approved

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