HVAC engineeringfor your buildings.

01 Docks and logistics

1. Lorries at the dockEach trailer reverses up to the dock: the dock shelter seals around it and the dock leveller makes up the height difference.
2. The cold stays inAn air curtain above each door limits exchanges with the outside; pallet trucks reach the cold rooms without breaking the cold chain.
3. The trailer stays plugged inAn uncoupled trailer plugs into its power point: its refrigeration unit runs on mains electricity rather than diesel.

02 Cold rooms

1. Two temperaturesThe chilled room holds +2 to +4 °C for fresh goods and the freezer room −20 °C for frozen goods, between insulated panels.
2. The evaporatorsOn the ceiling, the evaporator absorbs the room's heat and its fans circulate the cold air down to the pallets.
3. High-speed doorsThey open as the forklift driver comes through and close straight away: the room loses as little cold as possible.

03 Chillers

1. One unit per roomOn the roof, each condensing unit compresses the refrigerant and rejects outdoors the heat taken from its room.
2. The refrigerant linesThe liquid flows down to the evaporator and the gas returns to the unit: copper pipes laid on supports, through sealed roof penetrations.
3. Heat recoveredAn exchanger captures part of the rejected heat and sends it to the air handling unit: it preheats the offices' fresh air.

04 Solar energy

1. South-facing panelsThe rows of panels sit on ballasted mounts, without piercing the waterproofing, with walkways for maintenance.
2. The invertersThey convert the panels' direct current into alternating current, which the main switchboard distributes across the site.
3. Used on siteRefrigeration runs mostly during the day: the electricity produced on the roof goes first to the units, the biggest consumer.

05 Offices and VRV

1. A cassette per officeEach office and the open-plan area have their own cassettes, with their own controller and set point.
2. A single VRV networkTwo pipes, liquid and gas, link every cassette to the VRV units on the roof; branch joints share out the refrigerant.
3. Fresh air as wellDucts in the false ceiling supply fresh air from the air handling unit through the diffusers and draw stale air back through the grilles.

06 Air handling unit

1. Fresh air comes in, filteredThe heat-recovery air handling unit draws in outside air through its intake, then filters it before any treatment.
2. The thermal wheelTurning between the extract air and the fresh air, the wheel carries heat from one to the other: the energy in the stale air is not lost.
3. Coils and fansThe heating and cooling coils bring the air to the right temperature and the fans blow it into the offices.

07 Heat pump

1. The air gives up its heatThe fans draw outside air through the finned coils: the refrigerant evaporates there as it picks up the air's heat, even in cold weather.
2. The compressed gas heats the waterThe compressor raises the gas's pressure and temperature; in the plate heat exchanger, it gives up its heat to the loop water.
3. The cycle starts againThe expansion valve drops the pressure: the cooled refrigerant returns to the coils. The hot water goes to the buffer tank, then to the air handling unit. In summer, the cycle reverses.

08 BMS and supervision

1. The whole site, connectedSensors, units, air handling unit, VRV and inverters report their readings and alarms over the supervision bus.
2. The BMS cabinetThe controller reads the sensors, runs the equipment and raises alarms, day and night.
3. In the maintenance roomOn the supervision screen, the technician follows the refrigeration unit live: temperatures, pressures, defrost cycles, alarms and energy use.

BACS decree: a building management system is mandatory in commercial buildings whose heating or cooling exceeds 290 kW (deadline of 1 January 2025). Above 70 kW, it applies from construction in new buildings, and in other buildings when the system is renewed and by 1 January 2030 at the latest. The owner can be exempt with a study showing a payback period of more than ten years. Source: article R175-2 of the French construction and housing code (decree no. 2025-1343 of 26 December 2025).