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Condensation Tests on Glass Samples for Energy Efficient Windows
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.
2007 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, Vol. 91, no 7, 609-615 p.Article in journal (Refereed) Published
Abstract [en]

This article presents results from a pilot study comparing condensation patterns on small glass samples with different surface properties. Experiments were carried out on three commercial glass samples (clear float, TiO2-coated and SnO2-coated) to see how water condensed on the different surfaces. The experiments were carried out under a clear night sky in Uppsala, Sweden. It was found that the pane with the low-emittance coating stayed clean of condensation longer than the other two. In the morning, the water layer on the TiO2-coated sample was smeared out so that it was possible to see through that pane, while the view through the other two was still blurred. The TiO2 coating does not prevent condensation, but makes it easier to see through the water layer. These simple tests indicate noticeable differences between different surface materials and also that these effects can be studied by exposing small samples to a clear night sky without having to perform full scale tests.

Place, publisher, year, edition, pages
2007. Vol. 91, no 7, 609-615 p.
Keyword [en]
External water condensation, Energy efficient windows
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-95592DOI: 10.1016/j.solmat.2006.11.015ISI: 000245068400008OAI: oai:DiVA.org:uu-95592DiVA: diva2:169875
Available from: 2007-03-23 Created: 2007-03-23 Last updated: 2011-04-07Bibliographically approved
In thesis
1. External Water Condensation and Angular Solar Absorptance: Theoretical Analysis and Practical Experience of Modern Windows
Open this publication in new window or tab >>External Water Condensation and Angular Solar Absorptance: Theoretical Analysis and Practical Experience of Modern Windows
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Part I of this thesis is a theoretical background to parts II and III.

Part II treats the phenomenon of decreased visibility through a glazing due to external water condensation, dew, on the external surface. Some simulations are presented where it is shown that under certain circumstances condensation can be expected. A combination of coatings on the external surface is suggested to overcome the problem of external condesation. It consists of both a coating which decreases the emissivity of the surface and a hydrophilic coating which reduces the detrimental effects to the view through the window.

Fresnel calculations of the optical properties are used to discuss the feasibility of using different coatings. A new test box was used to verify that the proposed window coatings perform as expected.

Part III is a study on the angular dependence of solar absorptance in windows. Optical properties vary with the angle of incidence of the incoming light. The variation is different from one window pane to another.

A model is proposed to approximate the angular variation of the solar absorptance in window panes. The model is semi-empirical and involves dividing the wide range of windows into nine groups. To which group a window belongs, depends on how many panes it has and on the features of the outer pane. The strength of the model is that it can be used without knowing the exact optical properties of each pane of the window. This makes it useful in the many cases when these data are not given by the manufacturer and Fresnel calculations to get the optical properties of the window are not feasible. The model is simple and can be added as an appendix to existing standards for measuring optical properties of windows.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 132 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 283
Keyword
Engineering physics, Windows, External condensation, Radiative cooling, Optical properties, Coated glass, External condensation, Radiant cooling, Teknisk fysik
Identifiers
urn:nbn:se:uu:diva-7744 (URN)978-91-554-6830-9 (ISBN)
Public defence
2007-04-13, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2007-03-23 Created: 2007-03-23 Last updated: 2011-03-23Bibliographically approved

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