ComfoFond - geothermal heat exchangers

The Zehnder Comfosystems are fresh air systems that recycle approx. 90% of the heat in the exhaust air and use it to heat the fresh air. This saves considerable heating costs. An upstream earth heat exchanger pre-conditions the outside air. This increases the effective heat recycling efficiency by another 4 to 5 %.

The earth heat exchanger systems Zehnder ComfoFond use the slow-changing temperature of the earth in approx. 1.50 to 2.00 m depth. In winter, the earth has an approximate temperature of 8°C, and warms the air before it reaches the ventilation system. In summer, the earth temperature is approx. 12°C and the principle works in reverse. The warm outside air is cooled in the earth and directly piped into the house. This cooling effect makes it possible to keep the windows closed and to keep the warm air outside.


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