Community Research and Development Information Service - CORDIS

Passive sun control with holographic optical elements

The project aimed to investigate and test the potential of Holographic Optical Elements (HOE) for passive sun control. Based on a combination of transmission and reflection holograms, the HOE is a stationary shading device built into the glazing materials of buildings. By constructing and testing a prototype device, the project hoped to optimise the HOE design and investigate ways of integrating HOE into mainstream glass manufacturing processes.

Sun penetration can cause discomfort to occupants through reflective glare and overheating in the working space. Fixed or mobile shading devices, therefore, are essential for well designed solar buildings and comfortable indoor climates. Unfortunately, fixed shading devices as well as conventional sun control glasses act as obstructions for diffuse light penetration. Whilst movable shading devices perform better, they are more susceptible to mechanical problems. In order to achieve optimal energy efficiency, the project therefore planned to record several holograms with different information into one layer, and then fix it on a sheet of glazing. Two types of glazing were used: clear and translucent. It was hoped that this procedure would allow excellent light penetration whilst eradicating any mechanical problems. The use of such a technology could also greatly reduce the expense of air-conditioning systems.

Reported by

Büro für Energiegerechtes Bauen
Meerfeldstrasse 1a
50737 Köln
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