Tageslichtnutzung in Gebaeuden, Nutzakzeptanz von Lichtsystemen Abschlussbericht

During the planning process of buildings the energy consciousness and the visual comfort is getting more and more important. Since there are new daylighting systems on the market which promise to increase both - energy savings and visual comfort - there was no possibility to check these promises or to plan these systems. For that reason new procedures to assess performance and user acceptance have been developed. New innovative systems have been selected and investigated. 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. A fully turnable 1:1 twin test room at Fraunhofer ISE has been built during the project. With that facility, comparable system data are collected. Actually it is used to evaluate new blind systems for industrial partners. At BLL new test rooms for performing the objective testing and for measuring the illuminance distribution have been set up. Together with the new developed objective testing procedure, these rooms are used for getting performance values. In the Philips rooms different controls for artificial lighting are investigated and user assessments are performed. Computer models for some of the new systems have been developed out of the laboratory measurements. The validation of the models with the 1:1 system measurements has been successful. Due to general restrictions of the simulation programs, it is impossible to model all types of system now. Further developments on the simulation programs are necessary. 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. A lot of calibration measurements were needed to get the correct luminance and color distribution. 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. For a lot of the available systems it is now possible to evaluate the important issues user acceptance and energy savings. (orig.)SIGLEAvailable from TIB Hannover: F00B1174 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman