The rotor matrix is made for laminar airflow using alternating layers of smooth and corrugated foil to provide a structure comprising small, triangular channels.
The rotors are either one piece or sectorized. Sectorized rotors are divided into segments that are assembled when the rotor is installed. One piece rotors are made in diameters between Ø300–2600 mm, while sectorized rotors have diameters of Ø950-5000 mm.
Small rotors up to max Ø650 mm are glued; other rotors are made mechanically stable by internal spokes screwed into a hub and welded around the periphery.
The rotor may be installed vertical or horizontal (vertical is standard; horizontal is an option). One piece rotors up to Ø2030 mm may be installed horizontally, and sectorized up to Ø3200 mm.
Five different wave heights are available to enable optimization of efficiency and pressure drop.
Rotors are made in widths of 200 mm as standard in all materials, and can also be produced in widths of 100, 150 or 250 mm.
The Right Foil for all Applications
The Eurovent Certification defines 3 classes of rotary heat exchanger types:
Condensation Rotors – Non-hygroscopic (ST1)
The condensation rotor is a cost-efficient solution to recover heat and is suitable for standard applications in comfort ventilation. Humidity is only transferred in cases when the dew point of one of the air streams is reached during winter conditions.
Hygroscopic Rotors – Entalphy (STE1)
The hydroscopic surface of this rotor class supports humidity transfer. Typically used for standard applications in comfort ventilation systems to recover humidity during moderate temperature periods.
Sorption Rotor (HM1 molecular sieve 3Å)
The high performance desiccant coatings of the sorption rotor HM1 (molecular sieve 3Å) provide a maximum humidity transfer capacity for minimal Carry over. The high humidity efficiency is constant throughout all climate conditions. Sorption rotors are especially designed for summer season cooling recovery and dehumidification of supply air. Therewith, it should always be used in humid and hot climates, with dry cooling systems (chilled beams) and when in winter time humidifiers are used. This substantially reduces the cooling and humidification demand of the HVAC system. More..
For special applications, other suitable material types are available:
Increased rigidity (AK2)
Under extreme strain, for example, applications with automatic cleaning devices using high pressure water in industrial equipment, we suggest a minimum foil thickness of 100 micron.
Increased corrosion protection (STC,AK)
In an environment with aggressive components in the air it is either recommended to use a rotor with epoxy coating (STC1) or a sea water corrosion resistant foil (AK) for better corrosion protection. Such applications can be, e.g. dairy industry, on ships or for coastal areas. Other applications for additional corrosion protection are adiabatic cooling and cooling rotors of Direct Evaporative Cooling (DEC) units.
Sectorised Rotors, Divided casing
Large rotors need to be sectorised for the reasons of transport, stability and insertion into a building. The storage matrix is split into segments which need to be installed inside the divided casing at the final site.