For warm and col air...
To avoid misunderstandings: we are dealing with heat exchanging. But the principle also goes for cold air. Think about ventilation in air-conditioning devices and the ventilation of cool spaces in buildings, ships and lorries.
In the heat exchanger or recuperator the inflow and outflow pass each other via small ducts separated by a good conducting partition made from polystyrene. During the production we use special welding whereby channels perfectly connect to one another. This comes into very close contact, because even a little leakage can lead to strong efficiency loss.
Before your tailor-made heat exchanger leaves the factory, it is inspected on all criteria.
The newest generation of heat exchangers provides efficient ventilation in houses and buildings. Not only do you benefit from optimal ventilation the energy costs are also considerably less.
In cold periods, a heat exchanger recuperates the warmth from outgoing air and in warm weather humidity is extracted from the air while cooling. All in all this provides for better air quality and a reduced risk of humidity damage in buildings. This is very important. Dry rot, wet rot or mold and dust mites are not only unhealthy for humans but also for the durability of construction objects.
Good air refreshment minimalizes the accumulation of pollutant or harmful substances. With a heat recovering ventilation system you get the feeling of fresh air from an open window, without loosing energy or warmth.