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Closed translucent facade elements with switchable U-value - a novel option for energy management via the facade

: Pflug, T.; Kuhn, T.E.; Nörenberg, R.; Glück, A.; Nestle, N.; Maurer, C.

Postprint urn:nbn:de:0011-n-3241215 (350 KByte PDF)
MD5 Fingerprint: 6c511798b7e86e1e0255e827b1e87fc6
Created on: 7.2.2015

Energy and buildings 86 (2015), pp.66-73
ISSN: 0378-7788
Journal Article, Electronic Publication
Fraunhofer ISE ()
Thermische Anlagen und Gebäudetechnik; energieeffizientes Gebäude; Energiekonzepte für Gebäude; Fassaden und Fenster; u-value; facade; cooling; U-value measurement

To prevent the overheating of a well-insulated building in summer, façade elements with switchable U-value are a possible solution. A new translucent element with switchable U-value is presented. The convection around a translucent insulation panel is controlled by moving this panel vertically within the double glazing unit. Measurements of such elements show a possible switching of more than +100% of the U-value between the insulating and conducting state. Various geometries have been measured, and the influence of CO2 in the cavity has also been investigated. Based on the experimental results, TRNSYS simulations have been performed to investigate the overall performance of such a new element integrated in a real building. An optimized element could lead to a reduction of the cooling demand of up to 29.6% of the useful energy and to large improvements in the summer comfort.