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Knut OpdalEnergy Saving in Lighting by Utilization of Daylight Glamox AS, N-6400 Molde, Norway Bjørn Brekke Norwegian Electric Power Research Institute (EFI), N-7034 Trondheim, Norway Abstract In this project a study has been made of the direct and indirect energy saving potential in the utilization of daylight for interior lighting in buildings. The project is divided into two sections, first a full scale measurement test in 10 offices in Statens Hus (Government House) in Trondheim, and secondly a computer simulation section in which the same offices are simulated with the help of a computer. Both the measurements and the computer simulations cover one calendar year. The measurements show a direct energy saving potential by the utilization of daylight of about 30% using the constant lighting system, while the simulation of the same offices and systems resulted in a saving potential of just over 40%. Furthermore, the data computations show that in this particular building, there is no indirect energy saving potential resulting from changes in heating and cooling requirements. The project also included recordingration of the presence of persons in the rooms and the measurements show that the energy saving potential in lighting by the use of presence detectors is more than 60% in this building.
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