Evaluation and user assessment of lighting systems performance

Informazioni relative al progetto

ID dell’accordo di sovvenzione: JOR3950016

Progetto chiuso

Data di avvio 1 Gennaio 1996

Data di completamento 31 Dicembre 1998

Finanziato da

• Specific programme for research and technological development, including demonstration in the field of non-nuclear energy, 1994-1998

Costo totale

Nessun dato

Contributo UE

Nessun dato

Coordinato da

FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.*
Germany

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Risultati sfruttabili

Evaluation and user assessment of lighting systems performance

The market of daylighting systems is still growing, thus generating a need for evaluation and test procedures for the performance of the different systems. Two issues are crucial for the success of any integrated daylighting/controls system: - User acceptance. - Energy savings. For the testing of the user acceptance two procedures have been developed and validated: - Objective testing in office rooms equipped with the system. - User assessments in a static virtual reality. Both methods show that there is nothing like a "typical user", but at least two parameters seem to be crucial for user acceptance: - View contact with the outside. - Glare protection (especially for VDU workplaces). For the energy savings prediction a combined thermal and lighting simulation procedure has been developed. A well-defined optical and thermal model has to be set up in advance. A suitable test procedure to get the models has also been designed. Some general restrictions of the simulation tools lead to a great effort needed to develop the models. With the simulation models, the energy performance of a well-defined case can be calculated. There is no general ranking of systems possible, as the ranking would be different under different boundary conditions. These conditions are: - Geographic and climatic position of the building. - The orientation of the rooms. - Obstructions through buildings or trees nearby. - Design of the room (especially the room depth, colours). - Design value of the illuminance that is needed (e.g. office or floor). - Occupancy hours (e.g. office hours or half day school). - Whole year energy efficiency or seasonal accents (hotel, summer school). For a lot of the available systems it is now possible to evaluate the important issues, such as user acceptance and energy savings.