Stakeholders

Function : Environmental consultancy

Oikopolis

Roland Majerus, [email protected], Munsbach

 http://naturata.lu/fr/home/


Tenants and users

Contracting method

Other methods

Owner approach of sustainability

The clients wanted an eco-friendly building which is why they came to hainarchitektur. The motivation is simple: It’s about preserving the environment. This is achieved with simple constructions and high-quality materials which are used in such a way that the materials are genuinely designed and can be easily taken apart. By using a simple structural element which is not stuck together the materials can be used again. High-quality natural materials such as solid wood, natural stone, etc. can be re-worked and in a 'worst-case' scenario could once more become part of nature.
Constructing green buildings is what our practice aims to do. Consequently many projects have already been delivered following this objective. It is not always possible to achieve this 100% as it depends on the client; however, we always strive to achieve a very high proportion.
However, this project is 99% green, because this was also extremely important to the clients and they were prepared to go along with us and do what was needed.

Architectural description

Since this site had been used for the same purpose for centuries – back in 1700 it was a mail office where horses were changed on the Luxemburg/Arlon route and it had the coaching inn and farm that were part and parcel of this – the architectural design included the existing shape of the Luxembourg long house, however, it did replace the old stables.
The structure of the shop building was kept simple, since there was no wish for large apertures. This makes it easier to keep the building cool at all times of the year – as was proved this summer. Of course the thick green roof comes in very handy for this.
The choice of materials was more or less obvious: How else should local organic products be presented, other than by using natural materials from the local area. Wood is the best and easiest way of conveying this message. A design in harmony with nature was what the clients wanted and so this was what was created.

If you had to do it again?

I would do almost everything the same. I would just opt for seaweed as an insulation material because it is completely untreated and has even more thermal mass, which gives it a slight edge over cellulose.

Building users opinion

Extremely pleased.

Energy consumption

• Primary energy need : 28,00 kWhep/m².an
• Primary energy need for standard building : 10 000,00 kWhep/m².an

Calculation method : RGD du 30 novembre 2007 - bâtiment d'habitation

More information :

No information about consumption is available yet because the building has only just been recently occupied. When the requirements were calculated, heating from the cooling system was not included.

Envelope performance

• Envelope U-Value : 0,22 W.m^-2.K^-1

Indicator : EN 13829 - n50 » (en 1/h-1)

• Air Tightness Value : 1,16

Systems

Heating system :
• Low temperature floor heating
• Wood boiler
• Solar thermal
Hot water system :
• Solar Thermal
• Wood boiler
Cooling system :
• No cooling system
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Solar Thermal
• Wood boiler

GHG emissions

• GHG in use : 6,60 KgCO₂/m²/an
Methodology used :

The Grand-Ducal Regulation of 30 November 2007 – residential building

• Building lifetime : 100,00 an(s)

Life Cycle Analysis

Eco-design material : GFM diagonal panel: solid wood panel, 100% wood without any adhesive, airtight

Comfort

Health & comfort : The interior room temperature is regulated by using a reference room which is the dining room in the passive house, because it’s south-facing and therefore the first room to become too warm. Once it gets above a freely selectable temperature then external blinds drop down. To keep the management of the building as simple as possible, a conscious decision was made not to install any further automatic control systems. Complicated controls tend to become difficult to manage, users find them difficult, they are likely to break down and be used inefficiently, and most importantly the technology and software quickly become obsolete.

Product

GFM diagonal panel



Sägewerk Juncker

Rainer Faltin, [email protected]

 http://www.holzwerk-junker.de/index.php?article_id=34


Product category : Structural work / Structure - Masonry - Facade

Solid wood panel, 100% wood without any adhesive, airtight

The inhabitants and users are extremely pleased.

Urban environment

The building is on farm land, where a large part of the land continues to be cultivated. The supermarket is at the intersection between the area used for agriculture where crops are grown and chickens and cows farmed and the sales area at the front.

Green space

Green space : 250,00

Parking spaces

For its garden the passive house uses the supermarket’s roof area. This means that a 250 m² surface area is intensively planted and the remaining roof area of around 270 m² is extensively landscaped. This is also where the solar panels are located. There is a garden area around the rainwater retention pond with over 1,000 m² of hedges designed to blend in with the natural landscape. The remaining green area is used for growing crops.

Building Environmental Quality