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Glazing for Energy Efficient Buildings: The Almost Forgotten Role of Angular-Dependent Solar Transmittance
ChromoGenics AB, Uppsala.
ChromoGenics AB, Uppsala.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-8279-5163
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2019 (English)In: Society of Vacuum Coaters 2019 Technical Conference Proceedings.: Coatings for Energy Conversion and related Processes, Society of Vacuum Coaters , 2019, article id 0018Conference paper, Published paper (Refereed)
Abstract [en]

Glazing for energy efficient buildings comprises multi-pane units with surface coated glass. According to today’s standards, glazing is characterized by optical measurements at normal light incidence. Here we show that this prerequisite is grossly inadequate for common vertical glazing, in particular regarding solar transmittance and total energy transmittance (g-value). We present data on spectral and angular-dependent transmittance in the 300–2500-nm wavelength range for several types of glass samples with hard (tin-oxide-based) and soft (silver-based) coatings. Furthermore, we use standard procedures to compute g-values for triple-pane glazing embodying such glass and find that the g-value at 60° off-normal angle typically is as low as 65–68% of the g-value for normal incidence. This difference is essential for assessing the energy efficiency of modern buildings and highlights that the glazing’s angularity must be accounted for.

Place, publisher, year, edition, pages
Society of Vacuum Coaters , 2019. article id 0018
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-395338DOI: 10.14332/svc19.proc.0018OAI: oai:DiVA.org:uu-395338DiVA, id: diva2:1361883
Conference
Society of Vacuum Coaters 2019 Technical Conference
Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17

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Niklasson, Gunnar A.Granqvist, Claes-Göran
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