The building examined, which is situated in Barcelona, was refurbished in 2009. The size of the building did not change during refurbishment, only the room layouts were changed. The total floor space of around 6,800 m2 is distributed over six floors.
The office building was fitted with a Zumtobel lighting control system. The system obtains data via a central light sensor mounted at the top of the building. The external daylight sensor collects data regarding direct light incidence as well as the diffuse light. The system controls the lighting and adjusts the slats of the blinds dependant on daylight and the position of the sun and protects the façade from direct sunlight. This results in considerable energy savings.
Thanks to combined slat and lighting control, a total of EUR 29,487* are saved each year, in comparison with the building without any control system.
An analysis was carried out based on dynamic energy simulations. The scenarios simulated on the basis of a model building and the energy savings thus calculated were verified using real-time measurements.
The study was published by AJ INGENIERÍA José Luis Hernández, industrial engineer, in collaboration with CREVER research group for applied thermal engineering and URV Universitat Rovira i Virgili in Tarragona.
* Extrapolated to the total floor space of 6,800 m2 and taking into account an estimated local energy price of EUR 0.15, energy of 196,520 kWh and energy costs of EUR 29,487 are saved each year.