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Energy-efficient lighting control systems - results from the Finnish demonstration office building

Panel: Panel 4: Human dimensions of energy use and efficiency

Authors:
Tuomas Laine, Olof Granlund Oy
Ismo Heimonen, VTT Building technology

Abstract

Measurements and calculations in the Finnish office building showed that the savings potential of daylight control (dimming) was between 24 - 40 %. The effect of occupancy control varies a lot. Measured occupancy rate in the test rooms in the demonstration building varied between 45 - 100 % during office hours. The effect of the set point value of the lighting system was found to be considerable. Economical calculations showed that daylighting and occupancy controls were cost-efficient, when traditional technology was used. The LON technology is more flexible and economical in buildings, where many changes (e.g. partition movements) occur.

Usersƒ ability to affect on the lighting and the picture quality of the monitor using keyboard of their own PC was tested. Usersƒ experiences were evaluated by interviews. In the implemented system, usersƒ attitudes were found to be quite positive. In the evaluated system users preferred using the control system manually rather than automatically (closed loop control).

Paper

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