Air Ventilation Systems with Heat Recovery

Heat Recovery Air Ventilation Systems

When you are looking for a top-notch heat recovery air ventilation system, Kesair air handling units are your call. Our AHU’s are composed of fan-driven supply and exhaust air channels, and an energy-efficient heat exchanger. We use three types of heat exchangers in their air handling units; Fixed plate heat exchangers, rotary thermal wheels or run around heat recovery system with glycol coils.

The supply air is first filtered and then heated with water-filled radiators or with electric heaters. Supply air cooling, on the other hand, makes the inside air comfortably cool in hot summer months. Air handling units can also be constructed such, that they merely rotate the indoor air without replacing it.

Air Handling Units with Fixed Plate Heat Exchanger

Fixed plate heat recovery system is easy and relatively cheap to run. Supply and exhaust air do not get mixed up while moving through the system. Therefore, it is hygienic to use. Machines are suited both dry and damp conditions because they include condense water drain.

TIP: When you are designing ventilation using fixed plate air handling units, check that supply air channel is placed next to extract air channel. Also allow a good amount of space for the units, as they tend to be rather large.

Air Handling Units with Rotary Thermal Wheel Heat Exchanger

Rotary thermal wheel recovers heat by storing it to the rotating plate’s mass. The rotating plate takes up less space than a fixed plate does, so the assemblies fit into smaller spaces.

TIP: When you are designing ventilation using air handling units with rotary thermal wheel, check that supply air channel is placed next to extract air channel. For moderately dirty and damp spaces, we recommend using preferably AHU’s with fixed plate recovery rather than a rotor.

Air Handling Units with Run Around Heat Exchanger

Run around heat recovery system works by absorbing heat from exhaust air to a glycol coil and releasing it through an another coil to supply air. An advantage to this system is that it does not necessarily need supply and extract air channels to be next to each other. In addition, the installation is relatively easy. The fact that the supply and extract air masses never mix, makes this system especially hygienic and safe to use. We also recommend using AHU’s with run around heat recovery systems in places with extremely dirty exhaust air.