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L6: The Energy and Positive Water Laboratory

Highlighted Case 2018 Highlighted Case
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The building is a laboratory structure with 120 working places realised by Bouygues Construction. As a model in terms of innovation, fully integrating digital technologies, the building is completely flexible in order to stimulate creativity and improve the collaboration among researchers.

After acquiring 2 hectares of parcels that were formerly composed of scrap yards, the L'OREAL Group's Research & Innovation site has built (2018) its new research laboratory, the L6, with a twofold objective: environmental excellence and employee well-being.


Chemists, biochemists or biomechanics will join this new building of 5,000 m² spread over three levels.


The building has integrated the French HQE label obtaining, on the programming and design phases, the maximum rating of "Exceptional". A BEPOS Effinergie approach is also underway (excluding process needs), and the project has just won the ADEME call for projects for the Negative Carbon Positive Energy (E + C-) experiment.


The construction, federated around a low nuisance building charter, was based around a BIM model (3D building). It facilitated the organization of the work of the various trades, as well as the maintenance phases during the operation of the building.


The L6 will produce more energy than it will need for its operation. High-performance passive building, 1,500 m² of photovoltaic panels are installed on the roof and the outdoor parking.


A wind tree about 9 m high will recover energy through small wind blades and will serve to raise awareness of renewable energy.


In the continuity of what we have already undertaken on the site, the waters of activity of the building will be purified by a system of basins planted, the rainwater collected in two hydraulic structures of 350m3 vegetated, and the road water treated by hydrocarbon basins.


Rainwater will be used for sanitary water needs, and work is underway to reuse the filtered activity water for the sanitary supplement (winning project France Experimentation).


The goal is to meet 80% of these needs.


Energy consumption

I) Primary energy need :17,00 kWhpe/m2.year

II) Primary energy need for standard building :128,00 kWhpe/m2.year

III) Calculation method :RT 2012

IV) Final Energy :48,00 kWhfe/m2.year

V) Breakdown for energy consumption :

VI) Auxil distribution: 7%

Auxil ventilation: 26%

- Lighting: 26%

Sanitary hot water: 10%

Cooling: 19%

Heating: 12%

Envelope performance

I)  Envelope U-Value :0,50 W/m2 K

II) More information :

III) Insulation from the outside. The glazed walls were studied specifically both their proportion in facade, and the characteristics of the glazing. The characteristics selected are the following:

- ZZDouble anti-emissive glazing with argon blade of Ug ≤ 1.1 W / m².K

IV) SAir Tightness Value :1,20

V) hermal bridges are reduced to a minimum; this will be achieved by continuous insulation of the envelope, interrupted only in a few unavoidable places, in particular the crossings of the envelope by structural elements. Adequate solar protection will optimize the thermal behaviour of the building during the summer period.


For have access to further information, please visit the website of Construction 21.

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