Project: RENOVATION OF THE PETIT VAL SCHOOL GROUP IN SUCY-EN-BRIE (94)
Petit Val, a private Catholic educational institution, is located in an exceptional and historic setting in Sucy-en-Brie (94). The school accommodates 1,500 students across three units: kindergarten and primary school, middle school, and general high school.
With a heated surface area exceeding 10,000 m², the school group must comply with the regulatory requirements of the Tertiary Decree and the BACS Decree. A clear objective has therefore been set: to drastically reduce energy consumption by 40% by 2030 and to implement at least a Class C BMS (Building Management System) according to ISO 52120-1.

Compliance of Installations
A pragmatic approach based on a rigorous metering plan

In 2024, the school group launched a call for tenders to thoroughly renovate its installations while ensuring that construction work would not disrupt classes. Quite a challenge! The company ENEZEN relied on SIEMENS technologies to modernize the buildings in close collaboration with the site’s technical manager. Action plans and levers to meet the Tertiary Decree requirements were quickly identified: upgrading remote reading equipment, monitoring and managing consumption through the implementation of Siemens Desigo CC supervision and an associated maintenance contract.

Naturally, the next step involved installing suitable equipment and an efficient, open, and interoperable control system connected to a multi-site supervision platform (covering several buildings on-site) to provide a holistic view of the situation.
The first areas for consumption reduction were quickly identified: heating and ventilation.

The BACnet Protocol as a Response to the BACS Decree
A sustainable technology to unify and control installations

Existing heat production equipment (Synco KNX controllers) was integrated into BACnet IP supervision via a PXC controller to manage the two boilers supplying a radiator network. Intelligent room-by-room terminal regulation was installed to control direct expansion units producing heating and cooling in classrooms. This reversibility ensures winter comfort and, more recently, summer comfort, greatly enhancing learning conditions.

Air quality sensors (CO₂, temperature, and relative humidity) were also installed on each floor to measure comfort levels.

Ventilation received special attention, particularly in the building housing air handling units serving the cafeteria, compensation hood, and library.
By the first semester following the school year start, 19% energy savings were achieved, resulting in a 35% reduction in carbon footprint (CO₂)!

BACnet Protocol as a Driver of Energy Savings
Petit Val: more than a BMS installation – a true educational project!

Antoine Sajoux, director of ENEZEN, successfully proposed a BMS tailored to his client’s needs.

“The Siemens Energy Data eXplorer cloud application allows us to assess the building’s energy efficiency against reference values. The system detects efficiency losses in technical systems and informs the operator of improvement opportunities.”

Thanks to these positive results, project stakeholders and teaching staff are proposing an educational initiative focused on sustainable development, highlighting the benefits of building automation and emphasizing the importance of eco-friendly practices among younger students.

Contacts :

SIEMENS (manufacturer) – Yann PLEVIN

ENEZEN (integrator) – Antoine SAJOUX