Tri Pemorch Bihan, The Childhood Pole

6683
Last modified by the author on 25/09/2018 - 11:49
  • Building Type : Preschool, kindergarten, nursery
  • Construction Year : 2015
  • Delivery year : 2015
  • Address 1 - street : 56310 QUISTINIC, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 375 m2
  • Construction/refurbishment cost : 612 764 €
  • Number of Children : 120 Children
  • Cost/m2 : 1634.04 €/m2

Proposed by :

  • Primary energy need
    18 kWhep/m2.an
    (Calculation method : RT 2012 )
Energy consumption
Economical buildingBuilding
< 50A
A
51 à 90B
B
91 à 150C
C
151 à 230D
D
231 à 330E
E
331 à 450F
F
> 450G
G
Energy-intensive building

Environmental involvement:
The energy efficient design of this building has a passive purpose, based on the following bioclimatic principles:

  • efficient insulation
  • Solar gains and inertia
  • roof overhang to protect summer overheating.


Reduce the project's carbon footprint: The environmental footprint remains low due to the use of bio-sourced materials:

  • country wood for untreated framing (Douglas fir, chestnut),
  • organic straw of the town for the insulation of walls and roof,
  • cork for floor insulation and clay-based earthenware on straw walls.

Sustainable development approach of the project owner

The primary objective of this project was to provide equipment that meets the expectations of residents and especially the 120 students divided equally between the public and private. The problem to be solved was the upgrading of their respective canteens. Rather than renovating these two spaces, the municipality proposed to build a single piece of equipment on land that is equidistant from both sites.

The actors of the project were associated very early with the reflections of the elected representatives: the users (teachers, parents of pupils and municipal agents), the CAUE, the DDTM and BRUDED. Bringing all the students together in a single canteen helps to reduce the still vivid public / private divide and optimize the work of the communal staff. This also leaves the possibility of raising children's awareness of eating well by promoting the local organic sector and the health benefits of walking before and after meals. This equipment also houses a daycare, a relay of childminders and a room for young people.

On the technical side, the energy performance of the building approaches the liabilities thanks to the south orientation of the building, its compactness and good insulation, with the treatment of summer overheating. The environmental footprint remains low due to the use of bio-sourced materials: wood for the frame, straw for insulation and earth coatings.

On the financial side, the building will have cost less than expected.This is explained by the optimization of surfaces, the pooling of some of them and to a lesser extent the economy related to participatory projects.

To participate in the building sites, a call was launched among the population and neighboring communes who signed a convention of volunteer. Covered by the insurance of the town hall, they were supervised by the company Echopaille de Larré (56) and the Terraterre de Spézet (29) who have guaranteed the good realization of these lots with their decennial. Previously, straw harvesting and storage was directed by Denis Le Gall, deputy works and organic farmer, with the participation of volunteer residents.

The architectural approach of this project was therefore to register as long as possible in the landscape of the site. Thus the building is curling up against the existing slope of the ground and closing the axis of the road from the cemetery. The courtyard becomes a transition space punctuated by a courtyard cantilevered on the forecourt, providing a shelter for parents. The volume of this equipment on one level is simple, compact and open to the maximum on its south face.

Made with materials that are preferably bio-sourced, such as wood, straw and earth, it has made Quistinois aware of the local natural resources. This project was used as a teaching tool for both children and adults (site visits, discovery of natural building materials ...). Its energy-efficient design, with a passive purpose, is also based on the following bioclimatic principles: high-performance insulation, solar gains and inertia.

Architectural description

The program of this project includes the creation of a school restaurant, an after-school reception and a youth area.

The municipality is committed to an environmental approach to create this project in continuity with the town center. This approach can be summed up in several points:

  • The choice of location respecting the sunshine on the plot, the surrounding urban and landscape context with the integration of the hedgerow
  • Eco-construction and bioclimatic design (preferably bio-sourced materials such as wood, straw and earth) to serve as a teaching tool to sensitize Quistinois to local natural resources
  • The etymology of Quistinic, the chestnut grove, and therefore the forest, the wood, used in different ways in the project (structure, heating booster ...)

The architectural approach of this project is to register as long as possible in the landscape of the site. The building is wrapped in the slope of the land and closes the axis of the road from the cemetery. The courtyard becomes a transition space punctuated by a courtyard in port on the forecourt.



Contractor

Construction Manager

Stakeholders


    Thermal consultancy agency

    FT2I

    02 97 29 01 92

     http://www.ft1i.fr

    Air permeability measurement



    Company

    Sotrabat

    Lot 2: Structural work


    Company

    Loy

    Lot 3: Carpentry / Wood Framing / Insulation Lot 4: Exterior Carpentry Lot 8: Interior Carpentry


    Company

    Jego

    Lot 5: Cover


    Company

    Echopaille

    Lot 6 : Isolation paille


    Company

    Terraterre

    Lot 7: Earthen plaster


    Company

    JC Andre

    Lot 12: Electricity


    Company

    LMI peinture

    Lot 14: Painting

Energy consumption

  • 18,00 kWhep/m2.an
  • 47,00 kWhep/m2.an
  • RT 2012

    Energy consumption : Heating: 20 to 25% Domestic hot water: 15% Ventilation: 15 to 20% Specific consumption: 40%

Real final energy consumption

    195,00 kWhef/m2.an

Envelope performance

  • 0,17 W.m-2.K-1
  • 360mm straw insulated wall for West and North West
    Surface: 263.99m² U: 0.138 Percentage on the whole envelope: 20.51%
    Glazing surface 30.39m² U: 0.6 Percentage on the entire envelope: 2.36%

    220mm wood wool insulation wall for the southern part
    Area: 156.35m² U: 0.139 Percentage on the whole envelope: 12.15%
    Glazing surface 56.26m² U: 0.8 Percentage of the entire envelope: 2.36%

    Roof insulation with straw insulation
    Area: 393.84m² U: 0.142 Percentage of the entire envelope: 30.60%

    Floor tile
    Area: 386m² U: 0.132 Percentage of the entire envelope: 30.00%

  • 0,21
  • n50

  • 0,67

More information

The following electricity consumption was noted at the beginning of 2016: - January 1 to 18: 3316 kwh, 60 kwh / d in HC and 113 kwh / d in HP - From 1st to 15th of February: 2735 kwh, ie 62 kwh / d in HC and 120 kwh / d in HP - From February 16 to March 19: 6983 kwh, or 72 kwh / d in HC and 140 kwh / d in HP Daily consumption is therefore relatively constant, although with 15% increase in March 2016. Need heat: For this same period, the calculated heating requirement for the building is: - From January 1st to 18th: 1,000 kWh of useful electrical energy (electric heating coil). - From February 1st to 15th: 630 kwh in useful electrical energy. - From February 16th to March 19th: 1080 kWh in useful electrical energy. This requirement is calculated for an advertised efficiency of 86 to 91% (recovery yield of heat) of the double-flow plant, an average flow over the period and an internal temperature of 20 ° C. The building being at 15 kwh / m² / year of heating heat requirement is the passive standard. Other important items of consumption: - Central double-flow (fans): 400 w per fan for a medium flow on the period, - Dishwasher: installed power of 10.5 kw - Washing machine: 3 kw - Solar DHW and electric booster: 4.5 kw - Kitchen (hood and plate warmer): 2.75 kw - Refrigerators: 0.3 kw - Microwave oven: 0.8 kw - Kitchnette (local young): 4 kw - Other devices (computer, radio ...): 1 kw - Lighting: 4.5 kw That's a total of about 32 kw installed.

Systems

    • Others
    • Solar Thermal
    • No cooling system
    • Double flow heat exchanger
    • No renewable energy systems

Urban environment

  • 1 885,00 m2
  • 20,00 %
  • The project of the childhood center was built in the subdivision Korrigans located near the town center, to facilitate travel. The building was to be equidistant from the two schools of the communes

Product

    Marmoleum Real

    Forbo

    Siège Social Reims 63 rue Gosset BP 62717 51055 Reims - FRANCE Tél : 03 26 77 30 30

     https://www.forbo.com/flooring/fr-fr/

    Finishing work / flooring

    Eco-friendly flooring
    The raw materials used in the design of linoleum are:
    ● linseed oil, derived from the seeds of the flax plant
    ● wood flour from controlled forests
    ● jute, natural support on which linoleum is calendered.

    Easy installation by artisans
    Easy maintenance by municipal agents


    Organic straw

    Denis Le gal

    Finishing work / Partitions, insulation

    Organic straw grown on the commune

    Technical characteristic
    Material properties
    Thickness 37 cm, dimensions 47cm x 50 to 120cm
    Density: 100 kg / m³
    Compressive strength: 150 kPa

    Thermal properties
    Thermal resistance: 7.11 m²K / W
    Thermal conductivity λ: 0.052 W / mK
    Thermal mass capacity: 1500 J / kgK
    Phase shift (ISO 13786): 12h 30min

    Acoustic properties
    Sound reduction index: 43 dB
    Other
    Resistance factor to water vapor diffusion μ: 1 to 2
    Reaction to fire: Euroclass E
    Sound absorption coefficient αw = 0.65

    To isolate the building in straw was a wish of the mastery of work.
    Participatory workshops were also organized, with the aim of raising the awareness of future occupants and parents of students about straw insulation.


    Land of the site

    Finishing work / paints, mural, wallcoverings

    Clay plaster is mainly composed of clays and sand.

        density: about 1,600 kg / m3
        thermal conductivity: 0.91 W / m.
        not combustible

    Ecological balance: excellent for coatings produced on site. This natural material requires relatively little gray energy for its production (mainly extraction and sieving) and is completely recyclable.

    Using the resources present on the site and its surroundings was a desire of the project owner.
    In the same way as for straw insulation, participatory workshops have also been organized, with the aim of raising the awareness of future occupants as well as parents of students about the plastering of the land.

Construction and exploitation costs

  • 1 634,00
  • 89 320
  • 815 434
  • 506 000

Life Cycle Analysis

    The environmental footprint remains low due to the use of bio-sourced materials: wood for untreated framing (Douglas fir, chestnut), organic straw for the insulation of walls and roof, cork for soil insulation and earth-based clay plaster on the straw walls. The choice to use straw in the main insulation of the building was multiple: - a will to implement a natural material from agricultural production and identified as a resident wish to be able to produce this material on the commune thanks to the farmer Denis Le Gal who proposed to sow a wheat from organic farming which allowed to recover the straw by isolating.- organic straw, a healthy material, breathable with a very good thermal coefficient- the harvesting of the straw and the put in boots in a participative way: inhabitants and elected volunteers came to join hands voluntarily.

Reasons for participating in the competition(s)

​Implication environnementale : 
La conception économe en énergie de ce bâtiment a un objectif passif, s'appuyant sur les principes bioclimatiques suivants :

  • isolation performante
  • apports solaires et inertie
  • débord de toit pour protéger des surchauffes estivales.


Réduire l'empreinte carbone du projet: L'empreinte environnementale reste faible du fait de l'utilisation de matériaux bio-sourcés:

  • bois de pays pour l'ossature non traité (douglas, châtaigner), 
  • paille bio de la commune pour l'isolation des murs et du toit, 
  • liège pour l'isolation au sol et enduits terre à base d'argile sur les murs en paille.
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Author of the page

Florence DEVERNAY


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