Practices

Elementary school extension - Chauconin, France

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In October 2017, the municipality of Chauconin-Neufmontiers officially inaugurated the new premises of  "Marianne" school, an unprecedented educational extension for this town of 3000 inhabitants.

 

The project is carried out as part of a HQE label approach. It meets the BBC (RT 2012) criteria in the context of France's commitments in terms of sustainable development, energy savings and drastic reduction of greenhouse gas emissions, while focusing on comfort, occupant's health's and economical management of buildings.

 

The architectural concept allows a harmonious relationship of the building with its environment: location, volumetry, orientation, compactness, organization. Energy management has been favoured, architectural design optimizes energy consumption.  In this project, the environmental targets were achieved thanks to a direct investment from the municipality. The set is compact, its volumetry simple and designed with great sobriety. 

 

The envelope consists mainly of wood materials: frame and wooden cladding. Good energy management has been favoured, the architectural design optimizes energy consumption by the elimination of thermal bridges, the ability of the building envelope to reduce heating requirements, including a very good airtightness and very good insulation from the outside. The building's ability to reduce lighting needs by optimizing the natural lighting of the teaching premises, of course, but also by paying particular attention to providing the maximum amount of natural light in the traffic and equipping the building efficient and economical electrical equipment.

 

ENERGY CONSUMPTION

  • Primary energy need: 53,50 kWhpe/m2.year
  • Primary energy need for standard building: 110,00 kWhpe/m2.year

 

The project is designed to avoid any unpleasant physical sensation: The winter comfort will be ensured by heating optimization and ventilation systems. It is also enhanced by the heat contribution linked to the glass surfaces of the school's South facade.

 

ENVELOPE PERFORMANCE

 

Envelope U-Value: 0,53 W.m-2.K-1

 

More information: The envelope consists mainly of wood materials: frame and wooden cladding. Gantry structure with glued laminated beam. The exterior joinery is made of wood.

Good energy management has been favored, the architectural design optimizes energy consumption:

  • By the elimination of thermal bridges,
  • The ability of the building envelope to reduce heating requirements, including a very good airtightness and very good insulation from the outside.
  • The building's ability to reduce lighting needs by optimizing the natural lighting of the teaching premises, of course, but also by paying particular attention to providing the maximum amount of natural light in the traffic and equipping the building efficient and economical electrical equipment.
  • By optimizing heating and ventilation systems: high efficiency condensing gas boiler and double flow ventilation

Indicator: EN 13829 - q50 » (en m3/h.m3) (I4) m3/H.m2 n50 (Vol/H) Q4

 

Air Tightness Value: 0,76

 

INDOOR AIR QUALITY

 

The project is designed to avoid any unpleasant physical sensation:

 

  • The comfort of winter will be ensured by the optimization of the heating and ventilation systems, with the contribution of heat related to the glazed surfaces of the school's south facade.
  • Summer comfort will be ensured on the south facade by the wide roof overhang, completed by wooden sunshade blades.  In the summer, the natural ventilation at night allows the cooling of the premises, an adiabatic cooling unit provides refreshment during the day.

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