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Solar PV Building Skins: Structural Requirements and Environmental Benefits

Claudia Hemmerle

Abstract


The majority of the photovoltaic (PV) modules used in building skins contains glass, but does not entirely comply with the product standards and design rules for glass in building. As a result, structural applications are subject to individual approval by the building authorities in many cases. This paper presents experimental research on glass based photovoltaic modules, analysing their mechanical properties in comparison with approved construction products. The focus is on glass-glass modules and on the question whether the most common module configurations can be classified as laminated safety glass. Testing included residual resistance testing to study the potential to provide residual load-bearing capacity and shear testing to examine the interaction of photovoltaic cells and interlayer material as well as adhesion characteristics. If approved interlayers are used, glass-glass modules correspond to the safety level of laminated safety glass, because the PV integration does not impair breakage behaviour and improves residual resistance, while the observed reduced adhesive bond does not imply a higher injury risk. Formal classification of photovoltaic products within the product and design standards for glass in building could facilitate the use of building-integrated photovoltaics. Life-cycle assessments of photovoltaic systems so far concentrated on roof-top and ground-mounted installations. Based on these studies, the specific environmental performance of building-integrated systems was analysed. Constructive integration of the PV modules associated with the substitution of conventional materials in the building skin reduce the life-cycle environmental impacts like primary energy demand and greenhouse gas emissions, especially in those areas with suboptimal solar irradiation like façades. The net energy payback times calculated for Central European range from 0.8 and 5.6 years and the net carbon footprint varies between 12 and 192 g CO2-eq/kWh.

Keywords


Photovoltaics; glazing; laminated safety glass; approval; energy payback time; carbon footprint

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References


DIBt. (2012). Hinweise für die Herstellung, Planung und Ausführung von Solaranlagen. Stand: Juli 2012. Berlin: Deutsches Institut für Bautechnik.

DIN. (2006). DIN EN 61215:2006-02; VDE 0126-31:2006-02 Crystalline silicon terrestrial photovoltaic (PV) modules – Design qualification and type approval (IEC 61215:2005); German version EN 61215:2005. Berlin: Beuth.

DIN. (2009). DIN EN 61646:2009-03; VDE 0126-32:2009-03 Thin-film terrestrial photovoltaic (PV) modules – Design qualification and type approval (IEC 61646:2008); German version EN 61646:2008. Berlin: Beuth.

DIN. (2007). DIN EN 61730-1:2007-10; VDE 0126-30-1:2007-10 Photovoltaic (PV) module safety qualification – Part 1: Requirements for construction (IEC 61730-1:2004, modified); German version EN 61730-1:2007. Berlin: Beuth.

DIN. (2012a). DIN EN 61730-2:2012-09; VDE 0126-30-2:2012-09 Photovoltaic (PV) module safety qualification - Part 2: Requirements for testing (IEC 61730-2:2004, modified + A1:2011); German version EN 61730-2:2007 + A1:2012. Berlin: Beuth.

Dimova, S., Pinto, A., Feldmann, M., & Denton, S. (Eds.). (2014). Guidance for European Structural Design of Glass Components. Luxembourg: Publications Office of the European Union.

Schneider J., Kleuderlein J., Kuntsche J. (2012). Tragfähigkeit von Dünnschicht-Photovoltaik-Modulen. In B. Weller, & S. Tasche (Hrsg.), Glasbau 2012, (pp. 315-325). Berlin: Ernst & Sohn.

DIN. (2012b). DIN EN 1863-1:2012-02 Glass in building – Heat strengthened soda lime silicate glass – Part 1: Definition and description; German version 1863-1:2011. Berlin: Beuth.

DIN. (2015). DIN EN 12150-1:2015-12 Glass in building – Thermally toughened soda lime silicate safety glass – Part 1: Definition and description; German version EN 12150-1:2015. Berlin: Beuth.

DIBt. (2014). Allgemeine bauaufsichtliche Zulassung Nr. Z-70.4-194: Teilvorgespanntes Glas: f | ecofloat TVG, f | solarfloat TVG, f | solarfloat HT TVG, f | dur TVG. Berlin: Deutsches Institut für Bautechnik.

DIN. (2012c). DIN 572-2:2012-11 Glass in building – Basic soda lime silicate glass products – Part 2: Float glass; German version EN 572-2:2012. Berlin: Beuth.

Hemmerle, C. (2016). Structural Safety of Photovoltaic Modules in the Building Envelope. Challenging Glass 5, pp. 187-200. Ghent.

DIN. (2011). DIN EN ISO 12543:2011-12 Glass in building – Laminated glass and laminated safety glass – Part 1-6 (ISO 12543:2011); German version EN ISO 12543:2011. Berlin: Beuth.

HMWVL. (2012). Informationen für die Beantragung einer Zustimmung im Einzelfall. (Information Sheet). Wiesbaden: Hessisches Ministerium für Wirtschaft, Verkehr und Landesentwicklung.

LfB BW. (2009). Überkopfverglasungen im Rahmen von Zustimmungen im Einzelfall. (Explanatory leaflet). Tübingen: Regierungspräsidium Baden-Württemberg, Landesstelle für Bautechnik.

StMI. (2012). Hinweise zur Erlangung einer Zustimmung im Einzelfall (ZiE) gemäß Art. 18 Abs. 1 und Art. 19 Abs. 1 Bayerische Bauordnung (BayBO). Bereich Konstruktiver Glasbau. (Explanatory leaflet). München: Bayerisches Staatsministerium des Innern.

G. Espich (personal communication, September 20, 2011).

Wellershoff, F. (2006). Nutzung der Verglasung zur Aussteifung von Gebäudehüllen (Doctoral thesis). Aachen: Shaker Verlag.

DIN. (2000). DIN EN 12150-1:2000-11 Glass in building – Thermally toughened soda lime silicate safety glass – Part 1: Definition and description; German version EN 12150-1:2000. Berlin: Beuth.

de Wild-Scholten, M.J. (2013). Energy payback time and carbon footprint of commercial photovoltaic systems. Solar Energy Materials & Solar Cells, Volume 119, 296-305.

de Wild-Scholten, M. J., Cassagne, V., & Huld, T. (2014). Solar resources and carbon footprint of photovoltaic power in different regions in Europe. Proceedings of 29th European Photovoltaic Solar Energy Conference. Amsterdam.

El khouli, S., John, V., & Zeumer, M. (2014) Nachhaltig konstruieren (DETAIL green). München: DETAIL Institut für internationale Architektur-Dokumentation.

Fthenakis, V., Frischknecht, R., Raugei, M., Kim, H. C., Alsema, E., Held, M. et al. (2011). Methodology Guidelines on Life-Cycle Assessment of Photovoltaic Electricity (2nd ed.). IEA PVPS Task 12, International Energy Agency Photovoltaic Power systems Programme.

Hemmerle, C. (2015). Photovoltaik in der Gebäudehülle: Wertung bautechnischer Anforderungen. Photovoltaics in Building Envelopes: Evaluation of Structural Requirements (Doctoral thesis). Retrieved from http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-204836

DIN. (1990). DIN EN 1249:1990-09 Glass in building – Part 12: Thermally toughened glass, definition, dimensions, treatments, requirements. Berlin: Beuth.

Weller, B., & Härth, K. (2005). EU project BIPV-CIS Improved Building Integration of PV by using Thin Film Modules in CIS Technology: Results on Shear Tests with CIS-modules within workpackage 9. (Progress report). Dresden: Technische Universität Dresden.

Friedmann, M., & Kirchner, R. (2009). Versuchstechnische Untersuchungen an Fassadenplatten mit einlaminierten Dünnschicht-Photovoltaikmodulen. (Test report). Rohrbach: Friedmann & Kirchner Gesellschaft für Material- und Bauteilprüfung mbH.

Albrecht, G., & Maniatis, I. (2003). The use of laminated glass with photovoltaic elements. Proceedings of Glass Processing Days 2003, pp. 433-436. Tampere.

DIN. (2003). DIN EN 12600:2003-04 Glass in building – Pendulum tests – Impact test method and classification for flat glass; German version EN 12600:2002. Berlin: Beuth.

DIN. (2005). DIN EN 14449:2005-07 Glass in building – Laminated glass and laminated safety glass – Evaluation of conformity/Product standard; German version EN 14449:2005. Berlin: Beuth.

Friedmann, M., & Kirchner, R. (2013). Untersuchungen von Verbund-Sicherheitsglas mit eingelegten Solarzellen. (Test report). Rohrbach: Friedmann & Kirchner Gesellschaft für Material- und Bauteilprüfung mbH.




DOI: http://dx.doi.org/10.7480/jfde.2017.1.1528

Copyright (c) 2016 Claudia Hemmerle

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