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Light into the groove-heliostat technique

Developing light-technological planning foundations and components with which future sunlight installations could be implemented to solve the problems of urban regions suffering from a prolonged deficit of sunlight.

Rattenberg is a town with a population of approximately 500. It is located to the east of Innsbruck, in the Tyrolean Inn Valley. The town has a prominent historical town centre which is also a super-regional tourist attraction. Because the population has sharply declined over the last twenty years, authorized committees have inaugurated a town development plan. Part of this town development project was a survey among the populace of Rattenberg about the factors which they feel have a major influence on the town's appeal. Among the findings of this survey was the fact that 50% of the surveyed persons complained that Rattenberg suffers from a deficit of sunlight. This is the result of the town's topographical situation, which is completely enveloped for three months of the year in the shadow of the mountain chain to the south. In October of 2002, the study project "Sun in Rattenberg - Light in Rattenberg" of the students of the BARTENBACH LIGHT ACADEMY stems from this challenge. The investigation of the available sunlight in Rattenberg revealed that, in the months of November, December, and January - as well as part of February - the town receives no sunlight / lies completely in shadow. The narrow lanes, dense construction, and the closure of the historical air wells have further contributed to the general light deficit. This study shows that an increase in the amount of incoming sunlight and an enhancement of the overall living and environmental quality of the town is fundamentally possible through the use of a special mirror technology to introduce more natural sunlight. This study is attached to this application. The proposed project has the goal of developing light-technological planning foundations and components (heliostats and fixed mirrors) with which future sunlight installations could be implemented to solve the problems of urban regions suffering from a prolonged deficit of sunlight. In the course of this EUREKA project, a pilot installation will be developed in Rattenberg/Tyrol in order to test both the functionality and the effects upon a number of relevant parameters (the environment, street traffic, fauna, etc.) of this innovative technology. In order to achieve the aforementioned goal, this pilot installation includes a careful, completely innovative plan for the distribution of the collected sunlight over the town. It also includes a very complex, high-tech mirror technology not currently available on the commercial market. PLANNING: The kind of patches of sunlight reflected into the town (i.e. their size, shape, and intensity distribution) and their distribution over the town must be designed according to considerations of perceptual psychology and to architectural principles. Their effects must be checked experimentally in the framework of perceptual tests. MIRROR TECHNOLOGY: Furthermore, a high-tech mirror concept will have to be elaborated in order to achieve the desired level of incoming reflected light while taking into consideration diurnal and seasonal fluctuations and the tolerances of the mirror-tracking systems. The great distance from the heliostats (mirrors which track the position of the sun in the sky) to the targets (fixed-mounted mirrors above the town) requires extremely high-quality mirrors (with regards to surface and flatness) and high tracking precision (
Acronym: 
LIG-HT
Project ID: 
3 418
Start date: 
06-09-2004
Project Duration: 
48months
Project costs: 
580 000.00€
Technological Area: 
Lighting, illumination
Market Area: 
Other construction and Building Products Related

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