Energy efficient lighting and ventilation in an office building.

A publicly-owned office building in Eskilstuna, Sweden, has been retrofitted with high-frequency with self-regulating controls for the lighting and ventilation systems. The building has a total floor area of 19,000 m2 and contains more than 3 00 offices, a conference room, lunch rooms, and a recreation hall. Before retrofitting the total annual electricity consumption was 1/300 MWh and the district(heat consumption was 950 MWh. The total annual energy consumption was reduced by 20% as a result of the new installlations. Monitoring has shown a reduction in overall electrical energy consumption of approximately 30%. This saving comes from a 10% reduction in ventilation requirements, and a 40% reduction in electrical power demand.