- Building Type : Office building < 28m
- Construction Year : 2011
- Delivery year : 2014
- Address 1 - street : 6, rue Vauban L-2663 LUXEMBOURG- PFAFFENTHAL, Luxembourg
- Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
- Net Floor Area : 1 070 m2
- Construction/refurbishment cost : 5 251 245 €
- Cost/m2 : 4907.71 €/m2
Primary energy need :
(Calculation method : Other )
This is a new building which is home to the Mouvement Écologique Centre (Ecological Movement), known as MECO. In terms of layout, the building houses the centre's offices, along with the associated facilities (administrative offices, meeting room, archives, brasserie). The first floor is for the general public, with a library and open spaces for the public. For this building, it was decided to create a showcase building, complying with the required ecological and energy values in relation to the environment and in terms of sustainability. The building is almost entirely made from solid timber, both the structural parts and the cladding. The use of reinforced concrete has been limited to the areas where it is strictly necessary. The result is a simple building with a number of open and flexible floor areas.
3rd part certified
Other consultancy agencyT6-Ney & Partners s.à.r.l Civil engineer
DesignerSteinmetzemeyer architectes et urbanistes email@example.com Architect
Certification companyHubert Schmitz Conducting the blower-door test
Other consultancy agencyJean Schmit Engineering s.à.r.l. Technical engineering
OthersHBH S.A Coordinator-Leader
Owner approach of sustainability
For the Mouvement Écologique Centre the City of Luxembourg, as the client, wanted this building to be based on the passive building model, with aim of becoming a showcase for the solutions devised in response to sustainable development issues. As a result, the new building has been constructed in accordance with ecological principles and it fulfils the criteria of a passive building, with very good thermal insulation across the whole of the building's outer shell, with optimisation of the windows and doors in the outer walls, efficient sun shades, the ability to absorb internal heat energy, ventilation heating and potentially a heat pump to generate heat.
As the old building had serious issues with stability, damp and available floor space, the decision was taken to demolish it and erect a new building in its place. The proposed building, MECO, was to be built using materials that are healthy, innovative and environmentally friendly both today and in the future and which reduce the consumption of resources. It had to convey an ecological message whilst also ensuring its quality in terms of architecture and energy efficiency.
Building users opinion
"The resultant use of materials which fulfilled the ecological and health criteria unquestionably represents a benchmark. The overall mood inside created by, amongst other things, the generous use of natural light, wood and glass walls and the choice of paint gives a feeling of well-being. The windows overlooking the remains of the fortress and the old town as well as the terrace alongside the Alzette river form part of the building's genius loci." B.W.
- 116,40 kWhep/m2.an
- 120,00 kWhep/m2.an
- 60,30 kWhef/m2.an
- 0,22 W.m-2.K-1
- Condensing gas boiler
- Solar Thermal
- No cooling system
- Natural ventilation
- Nocturnal ventilation
- Double flow heat exchanger
- Solar Thermal
- 28,00 KgCO2/m2/an
Life Cycle Analysis
Health & Comfort
Second œuvre / Équipements intérieurs
In order to increase the building's thermal inertia, the walls and ceilings are made of plasterboards which contain "Phase-Changing Materials", PCMs. These materials are capable of storing thermal energy in large quantities and retaining it for a long time with small losses. This is made possible by the change in the thermal state from solid to liquid of a high-quality paraffin: when it melts after reaching a given temperature, it stores the heat energy which is given off (fusion heat) and returns it later when it solidifies. This phase change can be repeated as often as necessary.
This product has been well received by the various parties. Its thermal inertia properties are interesting and have provoked some positive feedback from the various different stakeholders.
Lignatur box floor
Gros œuvre / Structure, maçonnerie, façade
This type of box design fulfils some of the vital load-bearing structural criteria and fire resistance and also has a very positive environmental impact. These box elements also house some of the technical facilities and, lower down, sound-absorbing surfaces. These have been chosen over other products because of the very small amount of glue used in the manufacture of these elements.
Leaving these boxes visible gives a warm feeling to the rooms which increases comfort for the users.
Blown cellulose insulation
Second œuvre / Cloisons, isolation
The external walls are made of a traditional wooden structure and blown paper cellulose insulation. The benefit of the blown cellulose insulation lies in the way it fills all of the voids, leaving no gaps and thereby ensuring optimum efficiency. This material is entirely natural and has a very good thermal conductivity coefficient which is highly sought-after for its energy-efficiency qualities.
Good reception in view of its energy performance and its natural source.
The project is located in the Pfaffenthal district, at the bottom of the valley in Luxembourg City. MECO is part of a wider urban development project which has been in development since 2002 (construction general plan, district development plan, master plan and specific development plan). The urban general plan recommended increasing the building density, renovation of the school and even the reworking of the public spaces. The aim of the project was to restore the urban fabric which had been significantly damaged by demolitions and new buildings between the 1950s and 1970s by improving, amongst other things, the green aspect of the district, giving it a new eco-friendly dimension. The overall project has used techniques and materials which play an important role in the eco-friendly and energy-efficient future of the district and the city. In addition, it incorporates new planted areas and establishes new public outdoor spaces. In fact, new areas have been created. The external layout of the project can be divided into three parts: the passage, the extension of Boulevard de l'Alzette towards Parc Odendahl and all of the public areas of the school and MECO with the entrance to the school, the schoolyard with a playground and MECO's terrace and a small garden for the flat.
The urban development meets growing requirements and demand for mobility, providing the inhabitants and users with an underground car park for 25 vehicles as well as 7 outdoor parking spaces and a partially covered bike garage.
As for spatial quality, particular attention has been paid to the direction in which the rooms face, the views and the amount of natural light in the rooms. Indeed, given that the building is sited at the bottom of a valley with buildings adjacent to it, the light and outlooks available tended to be somewhat limited.
So a first step towards managing the natural light more efficiently and the energy it could contribute was to ensure that the functions in the building were arranged so as to provide the most favourable orientations and openings. The size of the openings is proportionate to the light needed for the functions and fits with the light and outside views available. Day light is visible everywhere without any areas being felt to be dark, whether people move around or stay put for an extended period. The openings are positioned so as to best frame the outdoor views which they allow to freely flow into the building.
The commitment to comply with passive-building criteria meant that particular attention was paid to ways of managing air quality and temperature inside the building, in particular through the building’s inertia, the windows and the ventilation, night cooling and sun protection systems. These systems run automatically so that the occupants do not have to get involved with the building’s technical functioning. Their working environment is healthy and comfortable all year round.