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Seminar on low-energy buildings: Local examples to boost inspiration!
June 26, 2012

Seminar on low-energy buildings: Local examples to boost inspiration!

June 14, 2012, Skövde, Sweden

Passive house standard and buildings constructed in accordance with this standard are on the rise throughout Europe. At the seminar in Skövde, the participants could not only enjoy the beautiful views from Billingehus Hotel and Conference Center, they were also able to listen to architects and engineers presenting their projects: the sports hall in Hällekis and day-care center in Skövde, both examples of highly energy-efficient buildings in western Sweden. The idea behind the seminar, which is part of a 3-stop tour of western Sweden, was to boost interest and inspire decision takers by showing successful local examples.

The sports hall in Hällekis has a simple building shape with controlled design of windows orientation in a highly insulated and highly air-tight building envelope. The walls are insulated with insulation of 300 mm with additional 70 mm on the inside. The floor is insulated with 300 mm of stone wool insulation in combination with another 100 mm of insulation for floor heating. The roof has 400 mm of insulation. This leads to very low U-value of 0.091 W/(m2.K). Special solutions and attention to the air-tight layer resulted in the measured air tightness of 0.3 l/s m2. Just for a comparison: the Swedish building regulations requires 0.6 l/s m2, demand is 0.1 l/s m2 and the best building measured in Sweden has reached the air tightness of 0.06 l/s m2.

The sports hall has a very good demand-controlled ventilation system, high control of lighting with high energy-class equipment and overall good energy management in the building. The lighting, using  T5 or LED, can be controlled to different light levels in accordance with the current activity. Fresh air and ventilation is supplied by two FTX ventilation units with rotating VVC with SPF 1.6-1.7; one unit supplies the hall and another one supplies all other rooms. The whole system has several sensors controlled by occupancy, CO2 and humidity levels.

By allocation an additional 7% higher than the budget of a regular efficient building, this building will use 23 kWh/(m2.a) as operational energy (in principle most of it will go to the lighting) and the total demand of 50 kWh/(m2.a). And all this will be documented with extensive monitoring system in 2014.

This seminar was organized by LÅGAN – a programme for building having very low energy use (2010-2015) and this organization intends to encourage new constructions, and conversions to, energy-efficient buildings, strengthen a national market for buildings having low-energy use, help create a comprehensive national body suppliers of products and services, and create confidence in them. LÅGAN also promotes new thinking by evaluating and disseminating information from demonstration projects, not only through the seminars and workshop, but by supporting development projects and local/regional collaboration initiatives. LÅGAN is a collaborative project between the Swedish Construction Federation, the Swedish Energy Agency, Region Västra Götaland, Formas and others. For further information, please visit http://www.laganbygg.se.

Photo by Henrik Paulsson