Innovation and energy efficiency: Setec is relying on ACTIsteel panels for its new regional headquarters in Vitrolles

A reversible radiant system for thermal comfort

The project relies on the installation of ACTIsteel hydraulic metal panels, used in Heating and coolingThis principle relies on thermal radiation, a technology that diffuses heat or coolness evenly, without significant air movement.

In this office building, 690 panels regulate the temperature of the spaces. In winter, radiant heating allows the set temperature to be reduced by 3°C, while maintaining an equivalent level of comfort. In summer, the system operates by circulating chilled water to limit overheating.

"ACTIsteel panels were chosen for their ability to meet the project's high requirements: energy performance, durability, and architectural integration."

This type of solution meets the current requirements of the RE2020, which encourages systems with low energy consumption and controlled user comfort.

An implementation adapted to commercial buildings

The panels are installed according to two main configurations:

• suspended ceilings for open spaces, with a distinctly technical aesthetic.
• Integrated into false ceilings in meeting rooms, for a more discreet look

Their large size (up to 3,6 m) allows for fewer connection points and optimizes installation. The push-fit connections facilitate hydraulic installation, a feature appreciated by HVAC companies during the construction phase.

A fluid engineering firm usually intervenes upstream to size the hydraulic network and guarantee the thermal balance of the system.

A technical solution combining thermal and acoustic properties

Beyond thermal comfort, ACTIsteel panels incorporate an acoustic function. The perforated surfaces, combined with a thermo-acoustic veil, contribute to reducing noise pollution in workspaces.

This dual use addresses the constraints of contemporary commercial buildings, where overall comfort includes:

• thermal quality
• acoustic performance
• energy consumption control

According to the data provided, the system would allow up to 40% energy savings compared to traditional fan coil unit systems.

A limitation to anticipate during the design phase

Like any radiant system, this solution imposes certain constraints. The thermal power depends on the available emitting surface area. This requires a close coordination between architect and design office to ensure sufficient ceiling space.

Furthermore, in cooling mode, dew point management is essential to prevent condensation. This requires precise control of water temperature and indoor humidity.

A commercial building designed with an environmental approach

The regional headquarters is part of a comprehensive approach to environmental performance, combining several technical devices.

Energy production and thermal inertia

The building includes:

• rooftop photovoltaic panels for local electricity production
• a Provençal well, exploiting the thermal inertia of the ground to preheat or cool the incoming air

This type of passive device helps to reduce energy needs in addition to active systems.

A recognized environmental certification

The project has obtained BDM Gold certification (Mediterranean Sustainable Building). This regional initiative assesses, in particular:

• the environmental quality of the building
• energy management
• user comfort

It involves monitoring throughout the project, from design to operation, with the involvement of various stakeholders: project manager, design offices, construction companies.

Architectural integration and construction systems

The integration of technical equipment is a major challenge in commercial building projects. Here, ACTIsteel panels contribute to the overall aesthetics of the building.

The choice of exposed suspension In certain spaces it fits into an industrial architecture logic, while maintaining consistency with the other visible technical elements.

In more sensitive areas, such as meeting rooms, integration into a false ceiling helps to preserve visual uniformity.

Example of a concrete application

In an open-plan office, suspended panels simultaneously provide:

• winter heating
• summer refreshment
• sound absorption

This versatility limits the need for additional equipment, thus simplifying maintenance and operation.

A comprehensive approach to comfort in commercial buildings

The project illustrates a fundamental trend in building design: the search for a overall comfortcombining thermal, acoustic and energy efficiency.

Hydraulic radiant heating systems, such as metal panels, follow this logic by reducing:

• energy consumption
• air movements
• visible equipment

However, their effectiveness depends heavily on the quality of design and coordination between the different trades.

By integrating these solutions from the design phase, project management teams can optimize the performance of the building envelope and technical systems, in compliance with regulatory requirements and actual uses.