Measured Energy Savings and Cost-Effectiveness of the Lighting Retrofit at Vattenfall's Office in Råcksta, Stockholm
An Evaluation After One Year
Claes Hedenström
Vattenfall, Sweden
Lars Hedström
Stockholm Energi, Sweden
Allan Ottosson
Vattenfall, Sweden
Abstract
The Vattenfall office, in the northern suburbs of Stockholm called Råcksta, is a commercial complex containing 76,000 square metres of office space, built in the early sixties. The office is in the process of being modernised. In this process a corridor with thirty-six office rooms has been remodelled with the aim of saving electricity while at the same time providing an improved work environment.
The project started with a test of different lighting designs in six office rooms installed by different manufacturers. The project in Råcksta, which is one of the Vattenfall energy conservation projects within Uppdrag 2000, is finished and the evaluation has been going on for one year. The corridor and office rooms have been totally renovated. The design of the lighting system is much more efficient than the old one. High-frequency ballasts are used and different kinds of control systems are tested; occupancy sensors, remote controls and daylight controls.
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