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conference paper

Embedded microstructures for daylighting and seasonal thermal control

Kostro, André Gabriel  
•
Geiger, Mario  
•
Jolissaint, Nicolas  
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2012
Nonimaging Optics: Efficient Design For Illumination And Solar Concentration Ix
SPIE 2012 International Symposium on Optical Engineering

A novel concept for an advanced fenestration system was studied and samples were produced to demonstrate the feasibility. The resulting novel glazing will combine the functions of daylighting, glare protection, and seasonal thermal control. Coated microstructures provide redirection of the incident solar radiation, thus simultaneously reducing glare and projecting daylight deep into the room in the same manner as an anidolic mirror-based system.The solar gains are reduced for chosen angles corresponding to a estival elevations of the sun, thereby minimising heating loads in winter and cooling loads in summer. A ray-tracing program developed especially for the study of laminar structures was used for the optimisation of structures with the above mentioned goals. The chosen solution is based on reflective surfaces embedded in a polymer film that can be combined with a standard doubled glazed window. The fabrication of such structures required several steps. The fabrication of a metallic mould with a relative high aspect ratio and mirror polished surfaces is followed by the production of an intermediate Polydimethylsiloxane moulds that was subsequently used to replicate the structure with a UV curable polymer. Selected facets of these samples were then coated with a thin film of highly reflective material in a physical vapour deposition process. Finally, the structures were filled with the same polymer to integrated the mirrors. The samples were characterised using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), confocal microscopy and laser profilometry. A miniature goniophotometer was built to assess the performance of the structured glazing. The daylighting behaviour was successfully demonstrated.

  • Details
  • Metrics
Type
conference paper
DOI
10.1117/12.930476
Web of Science ID

WOS:000312226700020

Author(s)
Kostro, André Gabriel  
Geiger, Mario  
Jolissaint, Nicolas  
Lazo, Gonzalez  
Aymara, Marina  
Scartezzini, Jean-Louis  
Leterrier, Yves  
Schueler, Andreas  
Date Issued

2012

Publisher

Spie-Int Soc Optical Engineering

Publisher place

San Diego

Published in
Nonimaging Optics: Efficient Design For Illumination And Solar Concentration Ix
ISBN of the book

978-0-8194-9202-9

Total of pages

12

Series title/Series vol.

Proceedings of SPIE

Volume

8485

Subjects

Complex Fenestration System

•

Ray Tracing

•

Thin Films

•

Daylighting

•

Seasonal Thermal Control

•

Microstructure

•

Replication

•

Goniophotometer

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LESO-PB  
Event nameEvent placeEvent date
SPIE 2012 International Symposium on Optical Engineering

San Diego, USA

August 13-16, 2012

Available on Infoscience
October 9, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/86031
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