uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Measurements of External Water Condensation on Simulated low U-value Windows with Different Coatings
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
In: Solar EnergyArticle in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-95596OAI: oai:DiVA.org:uu-95596DiVA: diva2:169879
Available from: 2007-03-23 Created: 2007-03-23Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 283
Engineering physics, Windows, External condensation, Radiative cooling, Optical properties, Coated glass, External condensation, Radiant cooling, Teknisk fysik
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
Available from: 2007-03-23 Created: 2007-03-23 Last updated: 2011-03-23Bibliographically approved

Open Access in DiVA

No full text

By organisation
Department of Engineering Sciences

Search outside of DiVA

GoogleGoogle Scholar

Total: 189 hits
ReferencesLink to record
Permanent link

Direct link