The energy system

The installation features a CHC-1200 air-to-water and water-to-water system that uses CO₂ as a refrigerant and integrates both heat pump and chiller functionalities. The setup includes specially developed air heat exchangers, which function as both energy collectors and heat rejectors. In summer, they operate in gas cooler/chiller mode to expel heat to the surrounding air. In spring and autumn, depending on whether cooling or heating demands the most energy, the air heat exchangers function as gas coolers or evaporators to boost and/or balance the system. In winter,
they collect ambient energy to enable full air-to-water heat pump operation.

At the core of the solution is Fenagy’s PLC system, which intelligently controls the operating modes in real time based on demand. This ensures smooth seasonal transitions and efficient internal energy balancing.

With this integrated solution, VELUX will be fully selfsufficient in heating and cooling - independent of external energy sources. The compact design requires minimal machine room space while delivering optimal energy performance and consistent indoor comfort in the entire building.

The energy solution supports the holistic renovation vision of the VELUX LKR Innovation House, uniting sustainable building design with year-round comfort and energy efficiency.