Rotary heat exchangers
A rotary heat exchanger consists of a rotating wheel with a multitude of small ducts made of aluminium. The warm extract air heats the ducts which transfers heat to the colder supply air. The temperature efficiency of balanced supply and exhaust air is high. Normally, frost never forms inside a rotary heat exchanger. This allows high annual energy efficiency to be achieved.
The rotary heat exchanger also effectively recovers cooling energy while moisture is recovered with a sorption-treated rotor. Normally used in commercial buildings such as offices, schools, etc.Read more
Plate heat exchangers
A counterflow plate heat exchanger consists of thin aluminium fins - plates - that form air ducts where the extract air counterflows the supply air for the best temperature efficiency. The warmer extract air heats the plates which transfers the heat to the colder supply air. The supply air and extract air flow in completely separate ducts, meaning that any odours or particles in the extract air are normally not transferred to the supply air.
The temperature efficiency of balanced supply and extract air can be as high as the rotary heat exchanger, but with the disadvantage that defrosting has to be dealt with.
Usually used in homes or facilities where there is a risk of odour transfer.Read more