Contractor

Name : Région Bretagne

Contact : Valérie CALAGE

 https://www.bretagne.bzh/

Construction Manager

Name : Egis

Contact : Jérôme DIOT

 http://www.egis.fr

Stakeholders

Function : Designer

Anthracite Architecture

Nicolas THEBAULT

 http://anthracite-architecture.com/


Design + architectural monitoring of works

Function : Construction company

Legendre Construction

Hilaire MENAGE

 https://www.groupe-legendre.com/


General contractor representative of the group

Function : Company

CCL Constructions

Eric DUBOST

 https://www.ccl-construction.fr/


Manufacture and installation of timber frame facades

Function : Contractor representative

Sembreizh

Amaury HUET

 https://www.sembreizh.fr/


Delegated project management

Function : Assistance to the Contracting Authority

ALTEREA

 https://www.alterea.fr/

Contracting method

Other methods

Energy consumption

• Primary energy need : 43,90 kWhep/m².an
• Primary energy need for standard building : 88,80 kWhep/m².an

Calculation method : RT existant

Breakdown for energy consumption : Heating: 32.4 kWhef / m² / year Lighting: 2.44 kWhef / m² / year Auxiliary Heating: 0.54 kWhef / m² / year Auxiliary Ventilation: 1.97 kWhef / m² / year

• Initial consumption : 157,00 kWhep/m².an

Real final energy consumption

Final Energy : 37,00 kWhef/m².an

Real final energy consumption/m2 : 37,00 kWhef/m².an

Real final energy consumption/functional unit : 37,00 kWhef/m².an

Year of the real energy consumption : 2 020

Envelope performance

• Envelope U-Value : 0,56 W.m^-2.K^-1
More information :

Existing concrete frame isolated from the outside by a timber frame wall. High inertia building Wood frame wall added to existing wall with 240 mm glass wool (120 + 120): Up = 0.21 W / m².K Roof insulation with 260 mm glass wool: 0.16 W / m². KIsolation Low floor in crawl space in flocking of 120 mm with insulation of 3-sided beams: 0.29 W / m². K Joinery: Ug = 1.1 W / m² ° C / TI = 70% / FS = 33 in the South and 65 in the North / Uf = 1.8 Wood-alu

• Building Compactness Coefficient : 0,60

Indicator : I4

• Air Tightness Value : 1,09

More information

Monitoring of consumption according to the IPMVP protocol framed within the framework of a Global Performance Market (MGP). Monitoring is done according to the feedback of meters defined in the metering plan of the IPMVP protocol, with energy report every year.

Systems

Heating system :
• Urban network
Hot water system :
• Urban network
Cooling system :
• No cooling system
Ventilation system :
• Single flow
Renewable systems :
• No renewable energy systems
Other information on HVAC :

Heating system produced by a biomass heating network. Variable flow pump installation. Regulation of the radiators by 2-way valve with self-regulation of the flow rate independently of the network pressure, connected to a room sensor controlled from the BMS. Regulation of the extraction air flow by shutter controlled by an analog signal allowing the air flow to be regulated independently of the pressure of the aeraulic network. The flow can be adjusted from the GTB.

Heating network using 56% renewable energy.

Solutions enhancing nature free gains :

Les gains passifs en énergie se font par: l'isolation renforcée des parois (mur, plancher, toiture), le remplacement des vitrages, le contrôle de l'étanchéité à l'air, l'isolation des tuyauteries.

Smart Building

BMS :

Installation of a building management system to control, control and manage technical alarms. The energy meters are sent back to the GTB allowing energy monitoring in accordance with the IPMVP. Use of a digital twin allowing the recalculation of the reference consumption according to the measurements (outside temperatures, schedule of use ...). Implementation of an Energy Management System (EMS) / Building Operative System (BOS) allowing the monitoring of energy consumption with the Client.

Smartgrid :

Creation of a Dig Data for data management allowing energy monitoring

Urban environment

• Land plot area : 200 000,00 m²

The Bréquigny high school is the largest high school in Brittany. It covers almost 20ha and accommodates more than 3,000 high school students. Its name, like that of its district, is inherited from the name of the seigneury of Bréquigny. The school is built on the site of the castle and its outbuildings.

This school project was born within a larger framework, of construction of an entire district, organized with a stadium and a public park surrounding the future equipment. Since its creation and its many evolutions, the school has energized the Bréquigny district with a wide influence. Our first intention will be to develop this influence by enhancing the image of the building in the neighborhood. A high school should be proud, timeless and powerful.

The buildings were constructed in several stages of expansion. All have known how to respect their elders and follow through on them, which has made it possible to produce a unitary site image today. All the buildings of the Lycée Bréquigny present a sober and tense script, revealing the obvious quality of the plant context and reinforcing the idea of a campus.

Our general approach has been to maintain this continuity by striving to keep a modern and evolving constructive logic by facade, but presenting the same qualities of efficiency and formal simplicity as the existing one, with the aim of making the image evolve. school while respecting its history.

A high school is also an identity that is passed on from generation of high school students to generation of high school students. These years of study mark the life of each of us. Working on the image of a high school also means integrating this temporal dimension and this emotional relationship of each.

Our ambition for Bréquigny is to give it back an image of elegance and rigor. For having already realized it, we know that black emerges an image of sobriety which makes of it a color very indicated to affirm these attitudes. We therefore worked all the buildings in a pigmentary coherence for which the lights of the black are expressed by their brilliance, their mattness and their depth linked to the properties of the metals we used: zinc, aluminum and steel.

These materials are a guarantee of durability and ease of maintenance for facades. Each entrance to the project is marked with a clear mineral material, the equipment of which refers to stone.

Product

Prefabricated timber frame facade



CCL Construction

Tel : 02 99 76 70 10 / mail : ccl[a]ccl-construction.fr

 https://www.ccl-construction.fr


Product category : Gros œuvre / Structure, maçonnerie, façade

From the first phases of the studies, the reflections are directed towards a process of mantle walls with wood frame for the insulation of the facades of the buildings, because it is the constructive mode which will make it possible to achieve the primary goal of the project: a significant improvement in the building's energy performance, with a low-carbon construction method, a process that had already been developed a few years earlier during the pilot project for the thermal renovation of Colbert high school in Lorient, a process that can be massively reproduced on other buildings with the same typology. The wooden frame facades, the FOB, are boxes made of a wooden frame, in which is integrated the thermal insulation of the facade, the air and water tightness devices, the exterior joinery, and finally everything that will make the exterior finish of the facade, its architectural side.It is a process that lends itself particularly well to the typology of the building which is the largest high school in Brittany: a great length of building, not very high, very repetitive in its length and characteristic of the constructions of the 1970s in precast concrete. A box corresponds to a storey height, its dimensions allow it to be loaded on standard heavy goods vehicles with a lowered platform, and thus reduce the cost of their transport. Beyond the technical solution, it is also the manufacturing method that been thought out, relying on off-site construction. The major advantage of the FOB is that it is almost entirely manufactured in the workshop, outside the construction site, which makes it possible to limit the nuisances on site, site occupied and in activity throughout the duration of the work, to significantly reduce the on-site response time and the overall duration of the site A short circuit was favored by working with a local company which is close to the site. The FOB model is thought out and designed to be simple, sober and efficient. This simplicity allows, very early in the studies, to concentrate on the development of details and the management of singular points. To do this, the project must be thought through in its implementation: method of fixing the caissons, junction of two juxtaposed caissons, treatment of the angles. It is all these reflections that will lead to an intelligent project according to the DfMA concept - “Design for Manufacturing and Assembly” - “Design for production and assembly”. The mode of grouping of the project in design-construction, in which engineering is associated with the construction company from the genesis of the project, allows the builder to be involved in our reflections. The construction method is thus developed by following the manufacturing processes of the construction company as closely as possible.

All stakeholders were won over by the process, which secures costs, deadlines and quality of execution. The site was carried out in a very unintrusive manner for the occupants, which perfectly met the constraints of the operation's occupied site.

Construction and exploitation costs

• Total cost of the building : 20 000 000 €

Indoor Air quality

No intervention on the interior coatings as part of the operation. Integration of a fresh air flow higher than the standard: 600 m3 / h per classroom.

Comfort

Health & comfort :

The airflow in each classroom has been sized so that the instantaneous CO2 build time does not exceed 1300 ppm for more than 15 minutes.

A flow rate of 20m3 / h per student and 25m3 / h per teacher was retained.

Calculated indoor CO2 concentration :

1200

Measured indoor CO2 concentration :

1150

Calculated thermal comfort : Température de 20° en hiver et moins de 3% du temps inférieur à 28°C en été.

Measured thermal comfort : 20° en hiver et 29°C en été

Acoustic comfort :

Acoustic comfort complies with the decree of April 25, 2003 relating to the limitation of noise in educational establishments.

Daylight factor : FLJ égale à 2% sur 80% de la surface de premier rang

GHG emissions

• GHG in use : 7,83 KgCO₂/m²/an
Methodology used :

Scope = consumption of heating (Rennes south urban network), lighting, ventilation and auxiliaries + construction products and equipment during the operation phase

• GHG before use : 295,00 KgCO₂ /m²
• Building lifetime : 50,00 année(s)

, ie xx in use years : 37.68

• GHG Cradle to Grave : 686,00 KgCO₂ /m²

Quantities of companies for the structure and architectural lots (detailed method). Ratio approach for technical lots on the basis of E + C- flat rate data (simplified method). Source of environmental data: INIES exclusi database

Life Cycle Analysis

Material impact on GHG emissions :

409

• Material impact on energy consumption : 5 776 340,00 kWhEP

Eco-design material :

The building is insulated by prefabricated wooden frame caissons, which makes it possible to incorporate a large mass of bio-based material into the project and to store carbon in the building.