The average consumption of energy in the Norwegian office buildings is three times higher than in new buildings with normal, energy-efficient solutions.
Air conditioning and ventilation systems are among the largest energy thieves in commercial buildings, but there are simple steps one can take in order to save several hundred thousand kroner a year on air conditioning.
Ventilation systems in office buildings use power equivalent to 23 households
In a typical Norwegian office building of 5,000 square metres, the energy consumption for ventilation comes to about 460,000 kilowatt hours per year, which is equivalent to the total energy consumption of 23 Norwegian households. According to Statistics Norway, each household consumes about 20 000 kilowatt hours per year. For a 5000 square metre office building that is not energy optimised, ventilation costs alone will be equal to fully NOK 391 000 per year, based on Statistics Norway’s average price of NOK 0.85 per kWh, including the price of power, grid rental and taxes.
It is particularly the power required for fan operation and heat recovery in air conditioning systems that uses the most energy.
Power consumption can be reduced from the equivalent of 23 households to that of about 13 through simple measures such as reducing the pressure in the unit (it will then use less power to move air), install more energy-efficient fans and better heat recovery of 60–85%. With these few steps you can save NOK 170 000 per year in energy costs.
By installing the very good demand management of ventilation and very energy-efficient fans, energy consumption can be reduced by the equivalent of another five Norwegian households, without compromising on indoor air quality. This will mean a further savings of NOK 85 000.
Thus, you can then save a hefty NOK 255 000 per year on overall energy costs. That means you can lower air conditioning energy costs from NOK 391 000 to just NOK 136 000 per year.
Energy measures are not only cost-effective, but they also improve the indoor climate.
- sfP* will be reduced from 3.5 to 2.0
- sfP will be reduced from 3.5 to 1.5 Simultaneity from 1.0 to 0.65
*sfP: power used to transport 1 cubic meter of air per hour
Energy and VVS