The school was built in 2012/13 as a public private partnership. The main energy related targets were to achieve passive house standard, to use prefabricated timber facades and renewable energy sources. The building should reach high indoor environment quality and fulfil the measures set in the Norwegian “Cities of the Future” - a collaboration between the government and the 13 largest cities in Norway to reduce greenhouse gas emissions and make the cities better places to live.
- Location: Søreide, Bergen, Norway
- Project type: New building
- Net cost: 24,95 million EURO
- Main contractor: Skanska Region Bergen
- Architect: Asplan Viak AS
- Building Owner: Skanska Norway
- Gross floor area: 8300 m2
- Construction time: Apr. 2012 - Dec. 2013
Technical solutions at a glance
- Passive house standard
- BREEAM NOR classification “very good”
- Partially prefabricated timber facade
- Heat pump and solar thermal system
- Balanced mechanical ventilation system with heat recovery
- Focus on indoor air quality
Description of construction
The building is scissor shaped. The supporting structure consists of low-carbon concrete (foundation and basement) and wood such as glulam columns, glulam girders and hollow core slabs (Sotrabjelken). The facades were partially prefabricated and are clad with Kebony, royal impregnated panels and stained panels. The average U-value for the outer walls is 0,13 W/m2K.
Process: The elements were delivered with a fabric on the inside and the insulation (30 cm) was injected on site and further covered with various materials. The outer layer was also mounted on site.
Energy data / Supply
The school was planned as a passivehouse, with a calculated final energy demand of 45 kWh/m2 a TFA. The heating demand is 5,6 kWh/m2 a TFA, which is well within the passive house limit of 15 kWh/m2 a. The school is heated with direct electricity, a solar thermal system and heat pump. The heat pump covers 80 % of heat needed for space heating and ventilation, and 60 % of warm water, the solar thermal system covers 30 % of warm water. The rest is covered by direct electricity. This gives a total annual CO2 emission of 10,2 kg/m2 .
Ventilation and indoor environment quality
A balanced ventilation system with a rotating heat exchanger and 83 % heat recovery was installed in the building. Indoor air quality has been one of the focus points in the design of the building. Measures were implemented to reduce problems associated with glare and the risk of health problems related to the flicker from light sources. The ventilation system was designed to reduce health-related risks of poor indoor air quality. Materials and products with documented low emissions of volatile organic compounds and other chemical substances/compounds were used, and appropriate thermal comfort levels were achieved.