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ENERGIX-Stort program energi

Daylighting solutions and systems for retrofitting buildings in the Nordic climate to low-energy, 0-energy or ZEB-standard

Awarded: NOK 1.2 mill.

DayLighting project started on the 1st November 2013. A research assistant has been employed at the Faculty of Architecture to work on the project together with the project manager NTNU/AB and partners: Link architecture and Glass and façade association. The activities of the project were: 1. Searching for solutions, systems and theoretical knowledge about daylighting systems. This resulted with nearly finished State of the art document; 2. Assessment of several buildings in Trondheim and in Oslo as potential research cases in the project; choice of two: Furuholmengård in Oslo and studios at Gløshaugen, the Faculty of Architecture at NTNU in Trondheim; 3. Participation in the activities of the IEA Task 50, where the monitoring protocol of existing lighting environment is nearly finished and a State of the art report has been completed; 4. From the June 21st, the project group started monitoring of lighting environment in the studios and registering the energy consumption for lighting; 5. A series of small models were made to test different concepts of new lighting solution in the studios, the testing will start in January 2015. 6. Scale-model measurements in Daylighting lab. were done for en shoe-box in 5 variations 7. Lighting simulations of the shoe-box in 5 variations have been also done with the help of Relux-Radiance and Ecotect-Radiance 8. We have organized for IEA Task 50 a half-day industry workshop in Alesund 03.16.2015 and 2-day Task 50th meeting on hurtigruta 16-18.03.2015. 9. The report describing the results of scale-model measurements in the 5 shoe-box rooms and computer simulations of the same rooms are finished. The rapport is written and published on line at Light & Colour Group web page. 10. We have supervised a master student from Italy, Serena de Simone, who has conducted thorough investigations, measurements and simulations of Powerhouse Kjørbo in Lysaker. Her Master Thesis is posted on the web page of Light & Colour Group. 11. A qualitative study of daylighting systems has been done in full-scale and presented at CIE conference in July 2015 in Manchester. 12. Alternative lighting solutions for studios at the NTNU campus on Gløshaugen were testet in scale models. 13. The best alternative has been selected for full scale construction in one of the studios. This implies the production of a specially designed and perforated acrylic plates, the production takes place at NTNU. 14. The best solution for retrofitting of skylight has been built in one of the studios in the NTNU-campus in Gløshaugen. The feadback from the users and architects colleges is very positiv. 15. It was carried out an evaluation of the solution with measurements of illuminance on the work plan for two scenarios: overcast skies and clear skies with sunshine. The light level is 2-3 times higher than in the neighboring room where the old solution remains. The project has been connected to the IEA/SHC Task 50 "Advanced Lighting for Retrofitting Buildings". This resulted with our contribution to several IEA publications, especially to "A Source book" http://task50.iea-shc.org/publications and publications from Subtask D "Case studies" where we have been most active.

Daylighting is especially challenging issue in low-energy buildings. All the typical changes connected to the transformation of a building to a low-energy standard have negative consequences for the daylighting level in interiors. Those are: increasing th ickness of the outside walls and roofs, increasing the number of glass-layers and the number of low-e coatings and increasing of the compactness of the building. This was throughly discussed e.g. in the paper: Low-energy house, back to the 'arestue': a thought experiment about low-energy houses. Architectural Science Review. 2012; volum 55 (2). S. 86-91. In low-energy buildings situated in urban context (huge outside obstructions) the minimum daylighting level recommended by TEK2010 is often not pos sible to obtain! New strategies and solutions for daylighting in buildings situated at high latitudes, especially in Norway, will be developed and tested. The most promising computer simulation tools will be tested and calibrated, and a new knowledge w ill be harvested from the international cooperation (IEA Task 50 Advanced Lighting Solutions for Retrofitting Buildings). The project will result with a guidance for owners of existing buildings, architects and engineers.

Funding scheme:

ENERGIX-Stort program energi