Contractor

Name : VILLE DU BOUSCAT

Contact : M. Alvarez, Chef du Service Patrimoine et Bureau d'Etudes Services techniques Mairie LE BOUSCAT

 https://www.bouscat.fr

Construction Manager

Name : HOERNER ORDONNEAU architectures

Contact : Frédérique Hoerner Mandataire chef de projet, [email protected]

 https://www.hoerner-ordonneau.fr

Stakeholders

Function : Designer

Eric Fouché

archi[at]e-fouche.fr

associate architect

Function : Designer

Type of market

Global performance contract

Energy consumption

• Primary energy need : 60,80 kWhep/m².an
• Primary energy need for standard building : 78,10 kWhep/m².an

Calculation method : RT 2012

Breakdown for energy consumption : see RT study

Real final energy consumption

Final Energy : 62,50 kWhef/m².an

Real final energy consumption/m2 : 78,10 kWhef/m².an

Year of the real energy consumption : 2 021

Envelope performance

• Envelope U-Value : 0,31 W.m^-2.K^-1
More information :

INDICATOR USED TO DETERMINE THE AIR TIGHTNESS COEFFICIENT:
Q4Pasurf. Target value: 1.7 m3/(h.m²).

PROOFS OR TESTIMONIALS OF ENERGY PERFORMANCE OR AIR TIGHTNESS:
intermediate airtightness tests which were carried out during construction in order to ensure (and correct if necessary) the defects of implementation according to the infiltrations observed.

• Building Compactness Coefficient : 0,51
• Air Tightness Value : 1,70

Users' control system opinion :

Users are demanding monitoring and control of consumption. The GTC put in place responds to this request.

More information

Gain 22.2% (RT -20%) The passive level targeted in design is reached with a Cepproject ≤ -20% of Cepmax.

Systems

Heating system :
• Heat pump
• Water radiator
• Low temperature floor heating
• Wood boiler
• Solar thermal
Hot water system :
• Wood boiler
Cooling system :
• Reversible heat pump
• Floor cooling
• No cooling system
Ventilation system :
• Natural ventilation
• Nocturnal Over ventilation
• Free-cooling
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Wood boiler
• Heat pump
• Renewable energy production : 10,00 %
Other information on HVAC :

8.6 kW reversible air/water heat pump

Wood pellet boiler
Photovoltaic solar panels

Solutions enhancing nature free gains :

INFORMATIONS COMPLÉMENTAIRES SUR LES ÉNERGIES RENOUVELABLES : 32,7 kWhep/(m².an)
SOLUTIONS AMÉLIORANT LES GAINS PASSIFS EN ÉNERGIE : chaudière bois de 60 kW

Smart Building

BMS :

GTC

Smartgrid :

Implementation of a GTC that regulates energy equipment and in particular the wood boiler / heat pump mix

Risks

Hazards to which the building is exposed :
• Geotechnical drought (Clay soil shrinkage and swelling)
• Earthquake
• Urban heat island

Risks measures put in place :

The building is resilient to global warming, through passive treatment and complemented by mechanical summer thermal systems. The building is frugal, it is designed according to its environment and its orientation and integrates passive winter and summer building solutions: heating and storage of winter solar gains, shade and freshness without summer air conditioning by overventilation, patios and revegetation. Paving and masonry walls, and the implementation of hemp concrete shear walls bring inertia to the building.

The heat island effect is treated by the strong vegetation of the site in the South, the mineralized forecourt part is located in the North. The masonry walls linked to this square are to the north. To the south, west and east, the facades have a wooden frame and cladding. Light colors make it possible to respect the Albedo. The revegetation extends to the foot of the building to avoid the reverberation of heat on hard ground.

The building is mostly flexible and light (mostly wood frame and framework, few masonry walls, roof with large non-welded panels). The building can move in the event of shrinkage and swelling of the clays in the ground or in the event of an earthquake. Expansion joints are provided. Seismic studies have been integrated into the structural calculations.

Urban environment

• Land plot area : 5 950,00 m²
• Built-up area : 38,70 %
• Green space : 1 694,00

The land is located on the northern part of Square Arnstadt, in the municipality of Bouscat.

Square Arnsadt is bordered to the east by a path serving a large area of allotments and overlooking the old railway line planned to be replaced by an urban park linking Bouscat to Bordeaux at Place Ravezies and line C of the tramway. .

The project is located as close as possible to the northern limit of the site to preserve as much of the square as possible on the south side, the gardens are placed to the south in continuity with the square and the trees of the square located in the right-of-way of the gardens are preserved.

The idea is to keep as much afforestation as possible, to complete it following the works and to give the greatest possible freedom of use to the square through generous open spaces, crossing walks and pleasant views for all from the roads, the park or building.

To the North East of the plot, a "piece of forest" allows the evolution of the site, its pedestrian and visual crossing in the East-West direction and the continuity of the ecosystem of the square in the North-South direction of type green corridor, in connection with the shared gardens and the future park on the railway.

A recolonization of the land by nature accompanies the project, architecture and landscape are intertwined.

The square development project retains, reinforces and completes the existing facilities that are well made, in good condition and appreciated by local residents. The latter have proven their attachment to the square by protesting against its amputation, so it seems essential to us to preserve everything that can be preserved: plantations, leveling, paths, pavings, pergolas, pavilions, century-old olive trees, street furniture.

Product

hemp concrete wall



Poitou chanvre

La Vergne, 79500 MELLE / Tel 0549077003

 http://www.poitou-chanvre.com


Product category :

Hemp concrete shear wall made up of a wooden frame, a hanging support in cannisse on which hemp concrete is projected: biomaterial mulch in hemp shiv + natural hydraulic lime. Hemp lime plasters cover both sides of the wall.

The solution is appreciated for the warm atmosphere created as well as the hygrothermal and acoustic comfort.

wood boiler room

Froling modèle PA Pellet 60.

entreprise K2 Energie, M Peyron, P 06 24 27 01 78, jerome.peyron[at]k2energies.com

 http://www.k2energies.com


Product category : Génie climatique, électricité / Chauffage, eau chaude

wood boiler 60 kW

The main heating solution of the ecostructure is the wood boiler room for the best desired carbon footprint.
In addition, an air/water heat pump is used for mid-season and when there is a high level of occasional demand. The first year, the delicate commissioning required a lot of adjustments. At the end of the heating period, this tended to improve.

indoor air quality (IAQ)



Product category :

There has been careful selection in the selection of low VOC and formaldehyde materials. A furniture consulting mission made it possible to select virtuous manufacturers and create bespoke wood-based furniture. Air quality measurement tests were carried out on benzene, formaldehyde and CO2 levels.

mashrabiyas - passive summer cooling



JSD

entreprise JSD, M DIDIER SOULE DUPUY Gérant 06.72.00.89.25, d.soule-dupuy[at]jsd-groupe.com

 http://www.jsd-groupe.com


Product category : Gros œuvre / Système passif

Two BEFUP concrete mashrabiyas located on the north facade complete the natural cooling system of the building in addition to the thermal draft openings located on the roof. Other transom openings or bay windows on multi-orientation and on patios complete the passive summer cooling system.

Moucharabiehs are well accepted mainly for their aesthetics.

Environmental assessment

Impacts avoided : water, waste, CO2 :

CO2: low carbon footprint (level C1)

clean site charter with waste sorting

Social economy

Social economy and professional integration :

insertion clause planned for 11 lots out of 12, 1925 H in total.

The town of Le Bouscat is committed to a proactive policy of integrating people in difficulty through work. To do this, they appeal to companies through public procurement. The incumbents carried out an integration action with a public encountering difficulties in accessing employment.

Indoor Air quality

Specific actions aimed at promoting indoor air quality: hemp concrete walls, careful selection of low-grade finishing materials, selection of virtuous furniture suppliers, production of bespoke wooden furniture, dual-flow ventilation.

IAQ test results on measured rooms / measured concentration:

Comfort

Health & comfort :

measured concentration of:

- Benzene = 0.342 (living room 1)

- Formaldehyde = 11.5 (living room 1)

- Formaldehyde = 9.00 (dorm 1)

Calculated indoor CO2 concentration :

sans objet

Measured indoor CO2 concentration :

concentration mesurée de dioxyde de carbone salle de vie 1 = 0, dortoir 1 = 0

Calculated thermal comfort : RT 2012 - 20%

Measured thermal comfort : bilan saison de chauffe en cours ( effectué sur 1 an )

Acoustic comfort :

The control method used to verify the acoustic quality of buildings is that defined in standard NF EN ISO 10052.

Acoustic test results compliant:

Average reverberation time, in seconds, in octaves centered on 500, 1000 and 2000 Hz

- Programmatic objective: < or = 0.7 s   (activity room)

- Measured: 0.7s (activity room)

Daylight factor : La lumière naturelle a été étudiée sur l’ensemble des pièces à occupation prolongée en phases APS et APD par des calculs type FLJ (Facteur Lumière Jour) réalisés avec le logiciel Dialux. Les FLJ atteints varient entre 1,5 et 4% selon les pièces.