The central innovation lies in utilizing the exhaust air for heating the brine via a heat exchanger, enabling year-round regeneration of the ground. This leads to significant cost savings for groundworks and minimizes space requirements, particularly advantageous in areas with rising property prices.

When the brine temperature is colder than the outside air temperature, the outside air regenerates the ground via a heat exchanger. This is often the case, especially in summer. Additionally, the drawn outside air is slightly cooled before ventilation heat recovery, providing additional cooling to the supply air and ensuring comfort even at high outdoor temperatures.

Integrating preheating of outside air via brine also prevents icing on the cross-flow heat exchang ...