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Forschungsstelle
BFE
Projektnummer
103326
Projekttitel
Integrated multifunctional glazing for dynamical daylighting

Texte zu diesem Projekt
 DeutschFranzösischItalienischEnglisch
Schlüsselwörter
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Kurzbeschreibung
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Publikationen / Ergebnisse
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Schlussbericht
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Erfasste Texte


KategorieText
Schlüsselwörter
(Deutsch)
TP0083;F-Gebäude
Kurzbeschreibung
(Deutsch)
Integrated multifunctional glazing for dynamical daylighting
Publikationen / Ergebnisse
(Englisch)
In this project, a novel integrated concept and the development of advanced glazing for dynamical daylighting are studied. The novel glazing will combine the functions of daylighting, glare protection, overheating protection in summer and thermal insulation in winter. Novel micro-structures shall provide redirection of the incident solar radiation, thus providing for chosen angles projection of daylight deep into the room in the same manner as an anidolic mirrorbased system, as well as glare protection. The solar gains will be reduced for chosen angles (e.g. for given incidence angles in summer at noon). Recently developed solar protection coatings ("M-coatings") shall provide the optimized spectral properties of the transmitted sunlight: maximized visible transmission for daylighting and carefully dosed energetic transmission for overheating protection in summer. The solar protection coatings simultaneously provide the necessary low thermal emittance in combination with a double glazing in order to ensure thermal insulation in winter. Technological progress will include the improvement of micro-structures by selective deposition of micro-mirrors, easier fabrication of micro-structures by sol-gel techniques and the powerful combination of solar protection "M-coatings" and micro-structures. In 2012, the software tools have been used to find an optimised structure offering both redirection of light for day-lighting and seasonal blocking of direct radiation for dynamic thermal control. This design was patented and presented at an international conference. Direct and diffuse transmitted energy have then been evaluated using data from meteonorm. Rendering using Radiance have been performed to evaluate the daylighting aspect. A company was contracted to produce an advanced mould corresponding to this design using electrical discharge machining of tungsten carbide. The feature period was lowered to 200 micron using a 50 micron diameter wire for the cutting. This mould was then spin coated with resin to further smoother the surface. Interference lithography and soft material engraving were studied as solutions for the production of smooth moulds. The mould was used to create microstructured samples of polymer. The sample were coated with aluminium and the resulting film studied. Some of the coated microstructures were covered with resin to embed the mirrors. The optical set-up was used to characterise the diffusivity due to the surface roughness and to evaluate the performance of embedded parabolic mirrors. The surface roughness was also measured using contact and laser profilometry.

Auftragnehmer/Contractant/Contraente/Contractor:
EPFL LESO-PB

Autorschaft/Auteurs/Autori/Authors:
Kostro,André
Schüler,Andreas
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Schlussbericht
(Englisch)
In this project, a novel integrated concept and the development of advanced glazing for dynamical daylighting are studied. The novel glazing will combine the functions of daylighting, glare protection, overheating protection in summer and thermal insulation in winter. Novel micro-structures shall provide redirection of the incident solar radiation, thus providing for chosen angles projection of daylight deep into the room in the same manner as an anidolic mirror-based system, as well as glare protection. The solar gains will be reduced for chosen angles. Technological progress includes the fabrication and improvement of micro-structures by selective deposition of micro-mirrors. An advanced set of software tools using an original algorithmic approach was developed specifically for this research. It was used for the development of a novel complex fenestration system combining an original 2D profile and thin films. A structure offering both redirection of light for daylighting and seasonal blocking of direct radiation for dynamic thermal control was found. Direct and diffuse solar gains were evaluated using radiometric data from meteonorm. Radiance was used to render daylighting in offices and compute illuminance levels. This design was patented and presented at both international and national conferences and workshops. An advanced mould corresponding to this design with feature periods of 200 micron was used in a 5 step process to create initial samples. The structure was replicated to create a soft mould for the nano lithography imprinting of polymers. The resulting polymeric structures were coated with aluminum thin films and embedded to create micro-mirrors. Critical steps in the fabrication process were identified and solutions were studied. An optical set-up was conceived and built for the optical characterization of samples. Samples surfaces and profiles were also studied using optical and contact profilometry, confocal microscopy, SEM and 3D SEM.

Auftragnehmer/Contractant/Contraente/Contractor:
Laboratoire d’Energétique Solaire et de Physique du Bâtiment (LESBAT)

Autorschaft/Auteurs/Autori/Authors:
Kostro,André
Schüler,Andreas
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