Active Ventilation with Heat Recovery

With the aim of reducing the overall energy consumption of buildings and thus both saving heating costs and protecting the environment, buildings have become increasingly dense over the past few years. This means that “natural” ventilation is severely restricted. The adequate supply of fresh air serves on the one hand to improve living comfort and on the other hand to prevent mold and thus to protect the building and the residents. Systems with heat recovery options tend to use the same principle:
A rotating fan inside the ventilation system transport used air from the inside to the outside. While flowing through the system, the used warm air transfers some of its energy to a ceramic heat exchanger, capturing the heat. After a set time intervall, the fan changes rotation direction to transport colder, fresh air from the outside, through the heat exchanger into the room. The heat exchanger transfers the heat to the air, providing for a simple, but sophisticated way of reusing the energy put into heating the room. This method uses siginificantly less energy than opening the windows, while offering for a controlled and higher air exchange.