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Lighting Performance and Energy Saving of a Novel Fibre Optic Lighting System
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. (Built Environment Energy Systems Group)ORCID iD: 1-6586-4932
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2013 (English)In: Proceedings of CISBAT 2013 - International Conference - Cleantech for Sustainable Buildings, 2013, 317-322 p.Conference paper, Published paper (Other academic)
Abstract [en]

The abundant luminous ux of 3000 - 4600 lm at 100 000 - 130 000 lx direct sun illuminanceat a 10 m ber distance was obtained from Parans ber optic solar lighting system SP3.The illuminance of 2400 lm at 100 000 lx, after a 20 m distance, was higher than specied.The illumination performance and energy savings of a solar ber optic lighting system havebeen veried in a study hall - corridor interior within the EU FP7 NMP project Clear-upat Uppsala University in Sweden. The system provides the intensive full spectrum whitelight with the color temperature (that describes the light color perceived) being 5800 300 K, i.e. close to the direct sunlight outside. The color rendering index (85) (thatdescribes how well colors are rendered under the light source) is higher for the solar lightsthan for the supplementary uorescent lights (77). Thus this high quality solar lightingimproves the visibility of all kinds of objects compared to the uorescent lights. Annuallighting energy savings of 19 % in Uppsala, Sweden and 46 % in southern Europe wereestimated for a study hall interior, as well as 27 % and 55 % respectively for an interiorilluminated 16 h per day all days of a year. The ecacy (the total output ux divided bythe consumed electric energy) of 300 lm/W was obtained at sun illuminance over 100 000lx is signicantly higher than for any articial light sources available. Furthermore, thespatial light distribution was noticed to be wider than the expected, and a new .ldt-le wasdeveloped from the data for lighting simulation tools. The illuminance distributions werestudied in the study hall under various sunlight conditions and the experimental data wasfound to correspond to the simulated light scenes. This solar lighting technology wouldhave the greatest impact in oces and other commercial environments where humanbeings would work under these lights.

Place, publisher, year, edition, pages
2013. 317-322 p.
National Category
Energy Systems
Research subject
Engineering Science
Identifiers
URN: urn:nbn:se:uu:diva-239153OAI: oai:DiVA.org:uu-239153DiVA: diva2:773351
Conference
CISBAT 2013 - International Conference - Cleantech for Sustainable Buildings
Available from: 2014-12-18 Created: 2014-12-18 Last updated: 2017-10-25

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