During the heating phase, heat is drawn from the water in the ice tank and delivered to the building via the heat pump. The further withdrawal of heat causes ice to form on the piping. This ice layer expands within the ice tank from the inside outwards during the heating phase. At the end of the heating phase, the ice tank contains almost 100% ice.
In the subsequent warm season, the 'stored' ice is used to cool the building. The transferred building heat melts the ice from the outside inwards. This natural cooling process is used until the ice has fully melted and the water temperature in the tank rises to approx. 10 °C.
As a consequence, around 70% of the cooling energy required in summer is naturally covered by the 'stored' ice. If the water temperature in the tank continues to rise, the heat pump can also be used as a cooling unit. Waste heat from the pump is in turn now 'stored' in the ice tank. Whereupon a new sequence can now begin.
The fact that the building is pleasantly warm or cool all year round is also as a result of so-called core concrete activation. Coils containing running warm or cold water embedded in the concrete layers are used to heat or cool the concrete and effectively provide balanced temperature control within the rooms. Any peaks in temperature within individual application areas are regulated via induction outlets in the ceiling.
The fresh air supply is delivered via a high-performance ventilation unit that filters, preheats or precools and dehumidifies air from outside. A highly efficient heat regeneration system is able to transfer up to 80% of the energy contained in waste air to the air delivered into the building.