June 12, 2014
Sweden

Bengt Dahlgren in Gothenburg

The office building Bengt Dahlgren in Gothenburg, Sweden was finished in 2009, and it has an area of 4,113 m². The building was designed and built to be energy-efficient, cost-efficient and have low maintenance. It has five storeys plus one technical floor, mostly filled with office spaces, and also conference rooms, apartment, cafeteria. The building has steel and concrete construction supplemented with insulation to secure excellent thermal properties, and the facade has 60% of glass (U-value = 0.85W/(m².K)).

The building was awarded by Green building certificate in 2008. The designed energy demand was calculated to be maximum of 75 kWh/(m².a), and the monitoring proves the real consumption between 75-79 kWh/(m².a) in first two years of operations of a building. The design target for the indoor climate was category B (ISO 7730) with 90% satisfied people with cooling with air and heating with water (district heating source). The demand-controlled ventilation system uses many sensors to control indoor climate: temperature, CO2 in conference rooms and VOC on each floor.

dl BDAB Huset, ett aktivt lågenergihus (link here)

Article by Henrik Jönsson and Berth Olsson for Passivhus Norden 2013.

The heating energy is supplied from district heating, and it is provided with a system with heat recovery from chiller & outdoor air heat pumps. The heat is distributed via radiators. There is special cooling equipment for the server. The chilled air is distributed in offices with mechanical ventilation with heat recovery (demand-controlled ventilation system). The building is equipped with motorised external blinds, and also the building has its own solar power.

dl Presentation about Bengt Dahlgren by Max Tillberg (link here)

September 2015. The presentation is all about the idea behind the Bengt Dahlgren building and its design.

In the presentation are also details about shading, ventilation system, building a management system (BMS), and Green building certification. The building uses a low-temperature heating system and has two parallel air handling units with heat exchanger and rotary wheel. District heating is used when internal heat loads and the sun is not enough. Heating with radiators is sequentially controlled with supply air diffusers. Spill heat from the cooling machine is used for hot water and radiators.

The cooling is supplied by an air/water heat pump to DX coil in air handling unit (AHU). A heat pump is placed in the exhaust air stream. There is a separate cooling system for a server room. The shading of a building is secured by external shades controlled automatically to provide a cool environment on sunny days, and at nights the shades are shut to keep warm in a building on cold nights.

Go to video, https://www.swegonairacademy.com/video/7540/ Swegon Air Academy seminar: “Bengt Dahlgren” (link here)

September 2013. Max Tillberg talks about design, operation and results from the monitoring of a Bengt Dahlgren building.

He shares his view on the performance of this Green building certified building.

Images by Max Tillberg

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