Case Study Energy-Efficient House in Finland

Case Study: Energy-Efficient House in Finland SP021a-EN-EU

Case Study: Energy-Efficient House in Finland

Villa Loiste was constructed for the Annual Housing Fair in Finland. It is a single family house that is constructed in light steel framing using energy efficient techniques with U values of 0,1 to 0,15 Watts/sq m/Degrees C. The building was monitored in operation for a year and it was found that energy use was only 30% of the equivalent use in a conventional Nordic house.

Villa Loiste, Kotka, Finland

Contents

1. The Achievement 2

2. Steel Solution 2

3. Project Team 3

Case Study: Energy-Efficient House in FinlandC

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1. The Achievement House of 200 m2 gross floor area.

Low U value of walls, roof and floors using perforated light steel C sections.

Tubular steel columns and beams incorporated in floors and walls.

Energy consumption of only 30% of that of a conventional house.

Adaptable internal space use.

Energy use of : 47 kWh/m2 – space heating 31 kWh/m2 – hot water

Solar energy roof for hot water system.

Purlins from air ducting system

High quality internal environment.

2. Steel Solution The house is located on a sloping site, with raft foundation on the upper side of the slope. On the lower side of the slope the house is founded on tubular steel piles, driven down to the bedrock. In the part of the house founded on a raft foundation the ground floor is a reinforced concrete slab. In the part founded on steel piles the bottom floor is a load bearing composite floor slab.

The load bearing vertical frame of the house is based on thermo profile wall stud elements; on the ground floor, tubular steel columns and beams have also been incorporated in the thermo purlin elements.

The intermediate floor between the two floors is in dry spaces realised as a ‘dry’ structure. The floor contains an integrated floor heating system. The requirements of adaptability were considered in the planning of the beam system. The load bearing horizontal structure of the roof consists of light steel sheet purlins and the thermo profiles that serve as a thermal break are suspended from these. In the part of the “solar energy roof”, the purlins are covered by profiled steel sheets, which act as a secondary load bearing structure and also form the air duct system.

In addition to good heat insulation, special attention was also paid to the air-tightness of the internal vapour barrier. An air barrier was installed between the 50 mm cross studding and the thermo profile frame. The external walls have a U value of 0,15 W/m2oC, and the roof has a U value of 0,11 W/m2oC.

The objective was to create thermal conditions that meet the requirements of a comfortable indoor climate. The energy solution focussed on minimising heat losses, on efficient use of energy as well as on utilising solar energy by new methods. The roof of the house acts as a solar collector that generates thermal energy for the heating of the house the supply air for the air conditioning system is preheated using solar collector realised with the steel roofing.

The heating system is constant temperature floor heating. The mechanical balanced ventilation system has a heat recovery efficiency of 80%.


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3. Project Team Project Team

Client: Ruukki Oyj

Architect: Asko Kaipainen

Structural Engineer: Finnmap Consulting


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Quality Record RESOURCE TITLE Case Study: Energy-Efficient House in Finland

Reference(s)

ORIGINAL DOCUMENT

Name Company Date

Created by Mark Lawson SCI

Technical content checked by Dr Graham Owens SCI

Editorial content checked by

Technical content endorsed by the following STEEL Partners:

1. UK G W Owens SCI 20/1/06

2. France A Bureau CTICM 20/1/06

3. Sweden A Olsson SBI 20/1/06

4. Germany C Müller RWTH 20/1/06

5. Spain J Chica Labein 20/1/06

6. Luxembourg M Haller PARE 20/1/06

Resource approved by Technical Coordinator

G W Owens SCI 24/5/06

TRANSLATED DOCUMENT

This Translation made and checked by:

Translated resource approved by:


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Case Study Energy-Efficient House in Finland

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