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Bjørn Brekke
Energy Saving in Lighting Installations By the Utilization of Daylight Norwegian Electric Power Research Institute (EFI), Norway Eilif Hugo Hansen University of Trondheim, Norwegian Institute of Technology Dept. of Electrical Power Engineering, Norway Summary A major research project is presently being carried out in Trondheim, Norway, in order to find quantitative measures for the energy saving potential in office building lighting installations when daylight is utilized for workplace illumination whenever possible. The project is performed as full scale monitoring studies, and consists of two separate phases. The first phase involves 10 office rooms in a 15 years old building, while in the second phase altogether 28 rooms in a new building are being equipped with monitoring instruments. in each room a specific combination of luminaires and lighting control system is installed, and a set of parameters concerning room climate, lighting conditions, presence of persons, and energy consumption are recorded continuously. In some cases in phase 2 also different daylighting systems for guiding daylight and sunlight into the interior of the rooms, are tested. The monitoring of phase 1 started in October 1992. The results so far indicate a substantial energy saving potential in the order of 30-40% in rooms facing south, and 20-30% in rooms facing north for this particular building.
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