IVL Swedish Environmental Research Institute

Eco-smart building – Kungsbrohuset

The building recovers excess heat generated by train commuters and uses weather forecasting to plan heat supply, in addition to other energy efficient measures.

Kungsbrohuset, which is situated by the Stockholm Central Station, is environmentally friendly in many ways. It is so environmentally friendly, that it only requires 51 kWh per sqm and year, which is half of the energy consumption prescribed by the National Building Institute (Boverket). Here are some of the measures taken to enhance energy efficiency in the building:

Waste heat and cold water utilized from the surroundings
The building recovers excess heat generated by the hundreds of thousands of commuters that pass by the Central Station every day. This excess heat is transformed through heat exchangers to warm water which supplies 15 – 20% of Kungsbrohuset’s need for heating. Cold water from Klara Lake is used for cooling.

Weather forecasts control the heating
Through updated weather forecasts, the building is able to control its heat consumption. This means, that the supply of heat increases several hours before an expected outside temperature drop. This system reduces the number of incidents of overheating.

Unique insulation
The exterior facade is 100% covered with glass, and the interior, which sits a bit inside the exterior, is 60% made up of glass, which reduces heat emissions in a unique way. Insulating materials keep the temperature between the facades about 5 degrees warmer than the indoor temperature. This way you can reduce the energy consumption required to heat the property. A Swedish invention that collects sunlight from the roof via fiber optics and leads it into the inner parts of the building also contributes to increasing energy efficiency and making the working environment more pleasant.

Other environmentally friendly solutions
• Kungsbrohuset has a new system that conducts daylight through fibre optics into dark staircases, thus reducing the need for ordinary lighting.
• The building has a green button, which interrupts the energy supply to mobile phone chargers, TV-receivers and other appliances, in order to reduce unnecessary consumption at nights and during weekends.
• Charging facilities for electric cars are installed in the building.


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