Contractor

Name : La Préfecture du Morbihan

Contact : [email protected]

 http://www.morbihan.gouv.fr/

Construction Manager

Name : AIA Life Designers

Contact : [email protected]

 http://www.aialifedesigners.fr/

Stakeholders

Function : Company

CRUARD

[email protected]

 http://www.cruard-charpente.com/


Implementation of the principle of the FMB® Façade

Energy consumption

• Primary energy need : 47,60 kWhep/m².an
• Primary energy need for standard building : 77,00 kWhep/m².an

Calculation method : RT 2012

Breakdown for energy consumption : Heating accounts for 34% of energy consumption followed by lighting with 32%, ventilation with 23%, ECS with 10% and auxiliaries at 1%.

Envelope performance

• Envelope U-Value : 0,30 W.m^-2.K^-1
More information :

The design of this high-performance and innovative office building respects several rules of passive construction: compactness of volumes, reduction of waste surfaces to a minimum, limitation of thermal bridges thanks to thermal insulation from the outside, fixed or mobile solar protection according to the orientation, and constructive solutions wood / concrete. On masonry foundations and ground floor rise glued laminated spruce beams, supporting mixed floors with apparent poplar sub-surface. An innovative and patented process has been designed and implemented on the facade that combines the flexibility of a wood frame with the mineral finish of a prefabricated concrete wall.

• Building Compactness Coefficient : 0,50

Indicator : I4

• Air Tightness Value : 0,90

Users' control system opinion :

Winter office temperature control is controlled by room via the radiant panels. A general instruction is imposed by the GTB, and a shift of +/- 3 ° C is possible locally by the users. In summer the temperature is not controlled. The users can act for their comfort on the mobile solar protections and on the opening frames if the thermal discomfort is preponderant compared to the acoustic discomfort of the external environment.

Time schedules are provided for each system: CTA, radiator circuit, radiant panel circuit.

In a general way: appliances equipped with LED sources are installed in circulations and areas requiring special decoration. In offices, T5 source luminaires have very low luminance scrolling grids and are associated with a presence and brightness detector that allows automatic regulation of artificial lighting according to natural lighting.

Systems

Heating system :
• Radiant ceiling
• Wood boiler
Hot water system :
• Individual electric boiler
Cooling system :
• No cooling system
Ventilation system :
• Free-cooling
• Single flow
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Wood boiler
• Renewable energy production : 36,00 %
Other information on HVAC :

Natural nocturnal ventilation in the offices, but also simple diurnal flow from the mid-season which is associated with the double flow associated with energy recovery


Installation of 825 m² of photovoltaic panels which represents 220 000 kWhEP (86kWc).
The annual EnR production provided by the PV estimated at 17 200 KWh EP / m².an

Solutions enhancing nature free gains :

Ventilation naturelle, conception bioclimatique,

Urban environment

• Land plot area : 12 409,00 m²
• Built-up area : 13,00 %
• Green space : 6 109,00
The urban challenge is to sketch the transformation of this former military site , closed and hermetic, in a permeable district and open to the city, and thus participate in the revitalization of the district of the station (ZAC Nord Gare) . The project is an urban landmark in the landscape from the railway and the RN 165 and carries with it the mutation of this geographical area of ​​the city. The project also integrates the desire to strengthen the green flow from the pond to the Duke through the extension of pedestrian paths and the development of quality landscaped areas on the Troadec site.

Product

 Mixed Façade Wood Concrete FMB®



Cruard Charpente et Jousselin

[email protected]

 http://www.jousselin.fr/


Product category : Gros œuvre / Structure, maçonnerie, façade

The FMB facade is an innovative facade to obtain the structural flexibility of the wood and the mineral finish of the concrete. It is constituted
a load-bearing wooden frame and an outer concrete skin. Its assembly is mechanical and realized via SBB connectors.
This system ensures the structural homogeneity of the building while respecting the richness of the architectural bias. Insulating, mixed, lighter than a prefabricated concrete facade, the FMB facade (in structure carried or carrier) allows a saving of weight and material on the secondary supporting structure (beams, poles or foundations). It also incorporates reinforced insulation.
The mixed walls are prefabricated, their implementation, by simple mechanical assembly is fast (no scaffolding or props).
Its composition avoids thermal bridges, especially to connections on floors and slats.
The modules composing the FMB facade are of a non-limiting length and a floor height (max. 4.00m).

This facade is the subject of an ATEX type B for this project

Construction and exploitation costs

• Cost of studies : 1 230 000 €
• Total cost of the building : 16 000 000 €

Water management

• Consumption from water network : 709,00 m³
• Consumption of harvested rainwater : 838,00 m³

Water Self Sufficiency Index : 0.54

Water Consumption/m2 : 0.11

Water Consumption/Work station : 3.55

Realization of a design study for a rainwater recovery equipment:
- annual consumption estimated at 709 m3 (560 for the toilets, 65 for the watering and 85m3 for the cleaning - washing) on ​​a volume harvested of 838 m3 in the year. Either 40m3 storage equipment providing 18 days of autonomy without rain covering the needs of the building. This 40 m3 cistern is used to supply toilets and taps for watering, cleaning and washing.

Indoor Air quality

We have designed the DDTM du Morbihan office building with a focus on indoor air quality.

We have based on three main factors, which are: Source limitation of emissions of potentially harmful substances: choice of products and interior coatings according to precise specifications Optimization of ventilation conditions Maintenance optimized and properly managed (note on the maintenance and the maintenance). Realization of a study on the provisions making it possible to ensure a good sanitary quality of the indoor air associated with a multicriterion study was thus realized in order to compare as well as possible the choice of the materials also the criterion indoor air quality has broken down according to the VOC emission threshold, compliance with REACH, compliance with the AFSSET protocol and the Floorscore protocol.

Comfort

Health & comfort :

The facades were designed by the iteration of dynamic thermal simulations and FLJ coupling the needs of hot, lighting and ventilation as well as the risks of overheating. A high ratio of bay windows promotes the penetration of natural light and the capture of winter solar gains: the frames are transformed into semi-curtain walls. Mobile solar protections, adapting manually according to the season, the solar race and the periods of the day, avoid the risk of dazzle and overheating in any season. For current floors:

• North-North East facade: external solar protection in fixed vertical wood slats, supplemented by external blinds for total concealment and interior blinds for protection against glare.
• East-South-East facade: L-shaped sun shading caps, supplemented by external blinds for total concealment and interior blinds for protection against glare.
• south-south west facade: external solar protection in movable vertical wood slats and interior blinds for protection against glare.
• west-north west facade: external solar protection in movable vertical wood slats and interior blinds for protection against glare.

The device consists of blinds micro-perforated canvas provides protection of users against glare. Ground floor:

• In the East: interior blinds + participation of vegetation nearby,
• South: interior blinds + overhang + wood blades in skirt,
• In the West: interior blinds + shutters + wood blades in skirt,
• North: interior blinds + wood blades in skirt.

Façade openings are used for natural ventilation during the day. Mechanical ventilation can be maintained at night by changing the schedule via GTB. Possibility of adding cold battery on the CTA in case of heat peaks.The architectural part for the project of the DDTM is to ensure wide access to the light of day both to promote the comfort of users but also to minimize the use of artificial lighting. Thus, we find: 100% of sensitive areas (offices, meeting rooms, lobby and relaxation area) that have direct access to daylight, 100% of traffic areas are equipped with lights at the gables. Glazed transoms at the level of partition walls between offices and traffic add an illumination in the second day of these spaces. The offices will be equipped with probes of presence and brightness, allowing to adjust the level of illumination. The offices are ventilated at 25m3 / h / pers, constant flow registers allow to guarantee this flow. Meeting rooms are equipped with a presence sensor or air quality to adapt the ventilation rate to the occupancy. Hourly programs allow the shutdown of ventilation systems during periods of vacancy. A terrace is fitted out for DDTM staff on the north side of the project; it is accessible from the local relaxation. It is sheltered from the prevailing winds of North and East orientation thanks to the presence of covered bicycle shelters located nearby. This terrace will enjoy a view of the landscaping planned on the north facade of the building (tree stems and shrubs).

Calculated thermal comfort : Dans 100% des locaux en moyenne, 9 heures en occ. (0,4 %) > 28 °C

Acoustic comfort :

The interior architectural layout planned for the operation of the DDTM ensures a clean and frank distinction between so-called sensitive / very sensitive premises and technical premises. The premises considered sensitive and very sensitive are the offices and meeting rooms. They occupy the current levels, from the ground floor up to level 4. The technical rooms are grouped at the level of the ground floor and semi-buried N5. The noise level of the equipment is limited to 75 dB (A) within these premises and the solid structure surrounding them will actively participate in limiting the propagation of sound to the sensitive areas of the upper ground floor.

In the current levels, the elevators are positioned at the level of the bracing cores and associated with the stairwells. This circulation space is separated from inter-office traffic via a landing door. Elevators and stairs are never adjoining a sensitive area or very sensitive. Systematically, one or more buffer spaces are provided at these locations.

Finally, downhill plumbing ducts are sealed with each other and located in the sanitary areas.

Several external elements represent a noise nuisance (classified national road, railroad ...) It is therefore foreseen the following provisions:

. façade isolation ≥ Regulatory isolation housing - 5 dB

. DnTA, tr ≥ 36 dB for the façade overlooking the RN 165

. DnTA, tr ≥ 31 dB for all other facades

GHG emissions

• Building lifetime : 15,00 année(s)
• GHG Cradle to Grave : 136,00 KgCO₂ /m²

Simulation under the ELODIE software in the design phase taking a 15-year building life hypothesis based on a mixed concrete wood structure

Life Cycle Analysis

Material impact on GHG emissions :

136

• Material impact on energy consumption : 1 040,00 kWhEP

Eco-design material :

Use of a mixed wood-concrete structure (148dm3 / m² of wood) accompanied by a hemp wool insulation (Biofib'isolation type). Use of sourced organic paint based on seaweed.