Modernisation of the lighting system increases the building value and saves energy too
Project: AEW high-rise, Switzerland

The energy-efficient refurbishment of an administrative building: electronic ballasts (ECG), modern lighting control and highly efficient luminaries achieve energy savings of 87% in offices and hallways.

Initial situation:
Refurbishing of the 40-year-old AEW Energie AG high-rise and the adjacent court house.

  • Use of conventional ballasts (CCG)
  • High energy consumption from obsolete ceiling lighting
  • 20m² offices with 6 luminaires à 3 x 40 W in group actuation

The solution:

  • Reduction from 6 to 4 luminaires, each 1 x 54 W per office unit
  • Use of dimmable electronic ballasts (ECG)
  • LIGHTGATE plus lighting management with daylight and presence control

The result:

  • Improved lighting quality
  • Reduced number of lamps through optimal planning to less than 25%
  • Energy savings via modern lighting management with constant light control
  • Increase in comfort thanks to individual dimmability
  • Savings in electricity costs of *59,000 euros / year
Obsolete
installation		 New
installation
Savings potential - 87%
Saved kilowatt hours p. a. - 330.317 kWh
Cost saving p. a. - * ca. 59.000 €
CO2 savings p. a. - 198 Tonnen
Corresponds to the CO2 emission of a car 1.126.077 km
CO2 saving corresponds to no. of trees 99 trees
Luminaires 3 x 40 W (KVG) 1 x 54 W (EVG)
Power consumption per luminaire 150 W 59 W
Total number of luminaires (240 offices) 1.440 pieces 960 pieces
Total power consumption 216 kW 57 kW
Savings from lighting management - 50%
Kilowatt hours p. a. 380.160 kWh 49.843 kWh

*Calculation basis for energy savings is the conventional nominal value of 18 cent per.

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