Earth Heat Exchanger
Brine-Earth Heat Exchanger
In the hot summer one likes to have a cool house. But how can one avoid undesired overheating? Of course, first of all by good heat insulation and shading of buildings to prevent the heat from entering the house in the first place. However, the ventilation system can also be used 
to contribute to preventing the house from overheating.
In contrast to the air, one of the characteristics of the earth is that it exhibits relatively even temperatures in summer and in winter. In summer it is considerably cooler than the outside air and can therefore provide us with cooling energy, in winter it is considerably warmer and can be used to preheat the air. With the SWT180 brine-earth heat exchanger, we utilise precisely this phenomenon in the following way:
A 100 metre long PE line (plastic piping as used for drinking water, for example) is installed at a depth of 1.5 metres around the house or in a trench in the garden. Through this piping flows a fluid (brine) which cannot freeze and can absorb and release heat very well. The brine line is laid in the cellar or in the room in which the ventilation system is also installed. The brine line is connected there to the brine-earth heat exchanger, which is a compact and completely pre-installed device in which the heat from the earth is transferred to the supply air (winter mode = heating case) or the heat from the warm exhaust air is transferred to the brine (summer mode = cooling case) by means of a heat exchanger.
This allows the ventilation unit to be operated continuously also at frosty outside temperatures in winter without having to switch to frost protection mode or have the outside air pre-heated electrically.
In summer you are provided with overheating protection for the house, however the cooling effect must not be confused with an air-conditioning system, which cools actively and accordingly consumes a great deal of power. But at least the ventilation system supplies considerably cooler fresh air in comparison to the outside air and at the same time constantly exhausts warm room air.
Accept the energy as present from the earth and utilise it with the brine-earth heat exchanger. The power consumption is minimal. It is limited to that of a small pump used to circulate the brine in the circuit.
GTC hygiene air-earth heat exchanger
An earth heat exchanger can be used to preheat the outside air in winter and cool it in summer. The air is sucked in at the intake point through an approximately 27-metre long duct, which is installed approximately 1.5 metres under the ground.
Winter mode:
The outside air is heated up to temperatures around 0 °C. This prevents the exhaust air from being cooled down too low and freezing the generated condensate. The so-called "frost-protection circuit" of the ventilation unit, which throttles or switches off the supply air flow rate to prevent the heat exchanger from cooling down any further, does not have to be activated. This enables even operation of the ventilation unit. Negative pressures in the building are avoided, since both fans can be operated continuously at the set capacity.
Summer mode:
Additional heating of the rooms is prevented by the outside air being cooled down. This is a very pleasant effect, however it must not be confused with an air-conditioning system. No active cooling can be achieved due to the low flow rates. The rooms will be allowed to heat up in the event of insufficient shading measures.