- Building Type : School, college, university
- Construction Year : 2012
- Delivery year : 2014
- Address 1 - street : 34000 MONTPELLIER, France
- Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
- Net Floor Area : 2 644 m2
- Construction/refurbishment cost : 8 800 000 €
- Cost/m2 : 3328.29 €/m2
Primary energy need :
(Calculation method : RT 2005 )
The school group Chengdu has very high energy performance, it is part of one of the new eco-neighborhoods of the city of Montpellier, the Eco-districtThis 3,080m² school group he positive energy building school regroups a kindergarten and an elementary school, for a total of 11 classes. The school is connected to the wood trigeneration urban heating network of Montpellier and is built in constrained site (important effects masks linked to neighboring buildings) has 290m² roof solar panels that can produce 20% more energy than the total consumption of school.
The school was designed and built so that comfort is ideal in summer as in winter while reducing energy requirements. The school complex is equipped with various innovative equipment (room control, GTC for heating, solar shading, natural ventilation, CO2 probe, counts and under counts, lighting dimming, window contact on windows shutting down the heater in case opening ...) allowing it to guarantee such results.
Coaching of the various users of the building was carried out to allow an appropriation of operation of the building and to help optimize comfort and energy savings. A guide for users has been set up and an explanatory comic for pupils. This school was the recipient of the call for Ecocity project launched by the state.
Chengdu The school is part of the Eco-district Park Marianne
Sustainable development approach of the project ownerObjectives: Positive Energy Buliding + 20%, all energy in a stress plot: 2000 sqm plot and large mask (Ground floor + 12 and Ground floor + 8 in the south), very tight deadlines.
1- Heating needs of 13kWh / m2
2- Natural lighting Autonomy 70% minimum,
3- Renewable energy production: 120% minimum consumption
4- Level of air-tightness less than 0.8m3 / h / m2
This is the 3rd positive energy building built by the city of Montpellier; the first had been carried out internally by the services of the city of Montpellier and the second was carried out by architect contests and works contract in separate trades
Architectural descriptionThe Chengdu school group is located in the ZAC Parc Marianne of the city of Montpellier. It fits completely in the dynamic of the place by presenting an urban and attractive architecture.
The heights, the colors, the materials, and the stratified architecture participates to the integration of the building in its environment. Built in ground forces (small plot of 2000m², surrounding high buildings) this school has been able to be optimized to accommodate students of 11 classes of the school group, and presents an interesting compact to limit the heat loss of the building.
The school is built on 3 levels and has intermediate levels with playgrounds and a bioclimatic garden. Each element of the frame has been designed to optimize space and contribute to user comfort. Sunscreen premises is ensured by wide overhangs roof and adjustable sun breezes. The south orientation of the main facade of the school allows a high amount of natural light and heat in winter. Circulations are located in buffer zones north of the building.
The 300m² of photovoltaic cells were incorporated into the roof of the R + 2.
See more details about this projecthttp://www.coste.fr/projet.html?projet=ec169
DesignerAGENCE COSTE ARCHITECTURES ANDRÉ ARIOTTI - 04 67 61 00 81 - [email protected] Architect
ContractorVILLE DE MONTPELLIER Michel IRIGOIN Project management - Energy Management and Technical Resources
CompanyBOUYGUES BATIMENT SUD EST (BBSE) Olivier DEQUATRE General Company
Thermal consultancy agencyETAMINE Sébastien RANDLE - 04 37 45 34 27 - [email protected] Thermic studies
Other consultancy agencyBETOM Ingénierie Franck RIVORY
- 37,00 kWhep/m2.an
- 87,00 kWhep/m2.an
Real final energy consumption
- 0,51 W.m-2.K-1
Corrective actions after the delivery of the building:
- 1-optimization of heating control and the temperature of the boiler,
- 2-optimizing speed variation breakdowns,
- 3-optimized presence / light detector settings;
- 4-changing communication gateway between heating and GTC regulation;
- 5-changing a warranty UPS;
- 6- hot water (DHW): returns the first ball of heat network does not exceed 25% (see: significant distance delivery points) to remedy and given very low needs of ECS, he was replaced by an electric ball
- Urban network
- Individual electric boiler
- No cooling system
- Double flow heat exchanger
- Solar photovoltaic
- 125,00 % https://www.construction21.org/france/data/sources/users/7500/chengu-photo-vue-du-ciel.docx
- 2 000,00 m2
Directional control of sun breakers
50 avenue du Nouveau Monde 74307 Cluses Cedex
Finishing work / Exterior joinery - Doors and Windows
Automatic control of the opening / closing of solar shading exterior windows into four zones
Provision by the software manufacturer and the formation of a city officer
Sealing air building
Finishing work / Exterior joinery - Doors and Windows
Throughout the phase of construction, Enexco accompanied all stakeholders concerned with good airtightness of the building:
1 - Step with educational slide show presentation of the importance of air sealing (including the smooth operation of double air handling units flows)
2 - Definition and trials with fellow responsible for the installation of glazing, good compribande seal affixed between the joinery and the frame (four tests were needed to confirm the right product)
3- air tightness test on a classroom test including smoke, with the room depressurization to visualize abnormal air inlets
4 - Test on a third of the building with the same procedures and measurements of air tightness (required value less than 0.8 V.h / m² under 4 Pa)
5 - Test the entire school and after various corrections obtaining a value of 0.5
Excellent contribution as a pedagogical and technical in particular to show the corrections to be made in phase construction as the choice of good materials and good procedures to get the right result
Presence detector and brightness
Mr RENAUDI Claude, [email protected]
HVAC, électricité / lighting
Room by room management of lighting according to the natural outdoor light and the presence of the occupants: the lighting is switched on if these two conditions are met.
In the classrooms, the detectors are two areas (corridor side and side window) and also the auxiliary contact is controlled by the presence detector and permits in the absence of stop heating from 9.00
Remote control for the adjustment of these detectors and training for city staff responsible for its maintenance.
Finishing work / Plumbing - Sanitary equipment
Placing all of flow control valves 8L / min (showers), 6L / min (offices and washing point) and 1.7L / min (sinks)
Control rates obtained by the technician in charge of water and regular checks on the possible scaling (including flow regulators to 1.7 L / min)
Center double flow air handling
Stéphan GIRARD, [email protected]
HVAC, électricité / ventilation, cooling
Implementation of air handling units with double flow with energy recovery wheel: recovery yield of 80%
The optimization of the operation of these plants dual flow was achieved in particular by laying G5 type filters instead of F7 initial filter which helped very significantly reduce pressure drop in the material and thus minimize power consumption
Remote management of climatic equipment
9 avenue du Marais Parc des Algorithmes Bâtiment Sophocle 95100 Argenteuil
HVAC, électricité / heating, hot water
1 - Establishment of a system of regulation and metering of all the school's consumption with control room by room regulation (indoor temperature, vacancy off, modulation of the air flow by CO2 detector probe stop in case of window opening). Measurement of all consumption of heating, electricity and school water: counters dealers (purchase and resale of electricity, district heating and two water meters (green space and building))
This regulation allows using a touchscreen boiler rooms drivers can know the time (locally or remotely over the Internet) the proper functioning of equipment, visualize on a block material in place and to be alerted in case of malfunction (by email). This tool set in particular the technician of the energy department of the city of Montpellier, enabled rapid appropriation of such equipment. The BEPOS control of the building is done monthly for all types of energy and verified that the building was well BEPOS + 20% on a full year.
Assistance Mission project owner from upstream to downstream of the construction site
Stéphan BEDEL, [email protected]
Management / Stakeholders involvement
SHI was chosen by the city (Izuba) to:
- 1 - Define the contractual performance as would ensure the MOE (four targets to achieve 20% of which BEPOS, airtight, light factor of the day and BBC - 20%).
- 2 - Each failure criterion was amenable to a penalty of 15000 (e) in case of non compliance.
- 3 - This AMO has accompanied the city throughout the construction phase and during operation the first years.
This support has been extremely beneficial for the city to ensure the quality and performance as the frame as well as equipment to help us start-up of facilities and monitoring of performance required
SUNPOWER FRANCE SAS
12, Allée du Levant 69890 La Tour-de-Salvagny;Tél.: 0 805 090 808
Management / Others
To be building positive energy + 20% the Chengdu school has 290m² of photovoltaic panels on two separate roofs. The 177 modules produced 75.8 MWh in 2015, despite a binding region (many masks). PV production is closely monitored. To detect an inverter default interface, available online, has not been established to monitor production in real time and check the efficiency of the inverters. Cleaning of the panels is carried out once a year to ensure better productivity.
Photovoltaic panels to ensure performance building positive energy of the school. A production monitoring is important.
- 168,00 m3
Indoor Air quality
Reasons for participating in the competition(s)
Energie et climat tempérés : L’école Chengdu construite en site contraint est un bâtiment réellement BEPOS, la production photovoltaïque couvrant 120% des consommations totale du bâtiment annuellement. Les différentes technologies utilisées au sein du bâtiment permettent un confort d’hiver et un confort d’été ainsi que des faibles consommations. Concernant le confort d’hiver, le bâtiment est isolé par l’extérieur, le vitrage est à isolation renforcée, la sous-station est reliée sur le réseau de chaleur de la SERM utilisant l’énergie renouvelable biomasse et la distribution par radiateur à eau chaude ; la régulation du chauffage se fait pièce par pièce, en fonction de la présence et de la température intérieure. Concernant le confort d’été, le bâtiment présente une inertie forte et des brise-soleil automatiques, orientables et relevables sont placés à l’extérieur pour protéger efficacement du soleil.