Angle-dependent optical properties of advanced fenestration systems—Finding a right balance between model complexity and prediction error
- 84 Downloads
Advanced glazing systems with special spectral characteristics or light redirecting behavior are commonly applied to improve building energy efficiency and indoor comfort conditions. The angle-dependent optical properties of such advanced windows can be markedly different from those of ordinary glass. To achieve accurate building performance predictions, it is necessary to represent the physical behavior of advanced window systems at a sufficiently high level of detail in building simulation programs. However, modelers should be aware that overly complex models are also undesirable, because they are costly to develop and input parameters are difficult to obtain. There is little guidance for simulation users to select an appropriate simulation strategy with respect to atypical glazing properties. This paper introduces a new approach for analyzing the influence of angle-dependent glazing properties, taking into account the effect of location and façade orientation. The potential of this method is demonstrated using an innovative switchable glazing system based on liquid crystals. A comparison between measured and derived transmission properties based on normal angle-of-incidence is presented. Results are presented for three European cities at different latitudes and for three different façade orientations. Using this new approach, simulation users can make informed decisions about appropriate modeling strategies for considering angular optical properties in building performance predictions.
Keywordsadvanced windows optical properties building performance solar radiation
The authors gratefully acknowledge Heijmans B.V. and Merck Window Technologies B.V. for providing input and support.
- Apian-Bennewitz P (2013). Review of simulating four classes of window materials for daylighting with non-standard BSDF using the simulation program Radiance. arXiv 1307.4214, 1–24.Google Scholar
- ASHRAE (2013). ASHRAE Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings. Atlanta, GA, USA: American Society of Heating, Refrigerating and Air-Conditioning Engineers.Google Scholar
- Clarke JA (2001). Energy Simulation in Building Design. Oxford, UK: Butterworth-Heinemann.Google Scholar
- Furler RA (1991). Angular dependence of optical properties of homogeneous glasses. ASHRAE Transactions, 97(2): 1129–1133.Google Scholar
- Jonsson JC, Curcija C (2012). Inter-laboratory comparison using integrating sphere spectrophotometers to measure reflectance and transmittance of specular, diffuse, and light-redirecting glazing products. In: Proceedings of SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 849509, San Diego, CA, USA.Google Scholar
- LBNL (2017). WINDOW7. Available at https://windows.lbl.gov/software/window.
- Van Oosten CL (2017). Device for the regulation of light transmission. Patent, WO2014191233A1, 2014-12-04.Google Scholar
- WinDat (2017). WIS. Available at http://www.windat.org.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.