Community Research and Development Information Service - CORDIS


Publishable final report on contract JOE3-CT95-0016

New daylighting systems on the market promise to increase both energy savings and visual comfort, so new procedures to assess their performance and user acceptance have been developed. A suitable testing procedure has been developed to get the necessary optical and thermal data. The systems have been tested in scaled models, 1:1 rooms and in optical laboratories. Computer models for some of the new systems have been developed out of the laboratory measurements. For the energy savings prediction a combined thermal and lighting simulation procedure has been developed, based on well defined optical and thermal models. A new procedure to investigate acceptance has been developed, based on photorealistic representation of computer-simulated scenes (SVR), which creates the impression of 3-D-virtual reality for the observer. User assessments in real offices and in SVR have been performed. The results show a good correspondence for the SVR results, especially for glare and brightness issues. One of the main results is the non-existence of a glare or comfort index, because the range of answers is extremely broad..

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