Recuperator's air-to-air rotary heat exchangers consist of a cylindrical rotor containing thousands of channels with a very high surface area, a casing (complete with brush gaskets to minimize leakage between the supply and exhaust air-flows), and a drive supplied by an electric motor that may, if necessary, have a speed controller.

Basic Features for rotary heat exchangers:
The exchange surface, which is very large in proportion to the volume, makes possible very high performance compared with other types of heat exchanger, reaching efficiencies as high as 85%.
High efficiency and the possibility of recovering both heat and humidity (with a hygroscopic wheel) results in greatly reduced HVAC loads.
Possibility of transferring latent heat.
The possibility of recovering humidity makes it possible to reduce the number of humidifiers.
Compactness can also be achieved with large size machines.
Low pressure-drop.

In rotary heat exchangers, the rotor, which is essentially a round heat bank, rotates through the two air flows, absorbing heat (sensible and sometimes latent) from the warmer air flow through one half, and transferring it to the cooler air flow through the other half. This process continues as long as the rotor is turning. The rotor's rotation speed may either be constant or varied by using a speed controller.
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T Series

Serie T

› Air Conditioning and Heating
› Swimming pool
› Industrial ventilation
› Marine application

Serie B
Summary table for quick reference.
Depending on the various options introduced, the sizes may vary from those shown.

Model Ø (in) B1 (in) A1 (in)
06 19.69 3.62 11.42
07 23.62 27.56 11.42
08 27.56 31.50 11.42
09 31.50 35.43 11.42
10 35.43 39.37 11.42
11 39.37 43.31 11.42
12 43.31 47.24 11.42
13 47.24 51.18 11.42
14 51.18 55.12 11.42
15 55.12 59.06 11.42
16 59.06 62.99 11.42
17 62.99 66.93 11.42
18 66.93 70.87 11.42
19 70.87 74.80 11.42
20 74.80 78.74 11.42
21 78.74 82.68 11.42
22 82.68 86.61 11.42
23 86.61 90.55 11.42
24 90.55 94.49 11.42
Please contact Recuperator for correct evaluation and selection.

Model Flow Rate cfm η % ΔP (inWC)
06 647 70 0.602
07 942
08 1,295
09 1,648
10 2,060
11 2,472
12 2,943
13 3,414
14 4,120
15 4,709
16 5,297
17 6,474
18 7,357
19 8,240
20 9,417
21 10,594
22 11,772
23 12,949
24 14,126


The rotor, which forms the exchange pack, is the main part of the machine; the material used to construct it is aluminum which, due to its physical characteristics (corrosion resistance, fire resistance, and longevity) is ideal in almost all applications where the heat exchanger is used.  
AC Treatment (epoxy coated)
For environments with an aggressive atmosphere, the rotor is protected by a coating of non-toxic, corrosion-resistant paint. The coated rotor is built from pre-coated aluminium coil already to insure air flow without restriction.
The rotor, made of pre-painted aluminum, can be inserted in a standard casing or in a casing that has also been pre-painted (see the TV option).
  Trattamento AC (rivestimento epossidico)
AT Treatment (hygroscopic coated)
The standard aluminium or coated aluminium matrix forming the rotor may be treated chemically with an alkaline solution of potassium carbonate, thus creating an oxidized surface that will make the rotor itself hygroscopic. Oxidation makes the surface porous at the microscopic level, thus making it possible to transfer humidity between the two air flows.
  Trattamento AT (rivestimento igroscopico)
AR Treatment (Sorption coated)
The rotor may be produced in a special hygroscopic aluminium, which ensures higher efficiency.
  Trattamento AR (rivestimento sorption)
AS Treatment (coated for saline atmosphere)
The standard or coated aluminum matrix forming the rotor can be treated to make it salt proof.. This material may also be used with the AR coating and AT treatment.
  Trattamento AS (rivestimento per ambiente marino)


Various options are provided for particular applications, to guarantee the correct operation for each type of requirement.

The Rotor
The rotor usually consists of aluminum sheets, which are alternately flat and corrugated. The flexibility of the product range makes it possible to offer also different rotor well heights.
Option XP (for a wheel of reduced depth)
For applications in which there are small rotary heat exchangers, and in which there may be space problems, or in which a low-pressure drop is called for, it is possible to choose rotors of reduced depth.
  Opzione XP (ruota a profondità ridotta)
Option XD (sectorized rotor)
For applications in which there are space problems for the assembly of units or transport problems, the casing can be delivered in parts and the rotor in sectors, for customer assembly.
  Opzione XD (ruota divisa in settori)
The importance of the casing should not be underrated, since with small adjustments, it is possible to have solutions involving considerable savings in time and expense. The standard casing is usually made of galvanized steel sheeting.
Option TP (casing with lateral covers)
The heat exchanger casing may be provided with simple covers for lateral closure.
  Opzione TP (telaio con coperture laterali)
Option TS (casing with special dimensions)
The external dimensions of the casing may vary in order to adapt it to the customer's requirements.
  Opzione TS (telaio con dimensioni speciali)
Option TN (no casing ­ only the rotor)
If required, Recuperator will also supply just the rotor, without any casing.
  Opzione TN (assenza di telaio ­ solo ruota)
Option TV (coated casing)
The standard casing may be protected against aggressive agents by a coating of special paint.
  Opzione TV (telaio verniciato)
To facilitate the supervision and maintenance of the rotary heat exchanger, the positioning of the motor inside the exchanger casing is important. All possible positionings have been given in the table.
Posizionamento-verticale   Posizionamento-orizzontale
Special application
The installation of rotary heat exchangers is not advised.

Significant presence of dust
The need to clean the heat exchanger periodically makes it advisable to choose a heat exchanger with a wide "L" rotor spacing, to facilitate the removal of impurities.


The electric motor, which enables the heat exchanger to be used, is designed in accordance with the size of the rotor. Various voltages are available, as well as variable speed motors.

Speed Controller
The speed controller may be supplied together with the rotary heat exchanger, with a 240 V motor with thermal contact. The speed controller, like the motor, is to be installed on the inspection side of the rotary heat exchanger.

The controller consists of three main components:
MiniMax monitor

Micromax Manual

Summarizing Schedule

Motore   MiniMax monitor
Sensore   Magnete


Purging Sector
The possibility exists of some contamination between two air flows through either leakage or entrainment:
Leakage takes place due to a difference in static pressure between two air flows. To prevent this happening, it is possible to install a fan that will keep the discharge (contaminated) flow at a lower pressure.
When entrainment occurs, the air remaining trapped within the wheel is transferred to the other flow after half a revolution. To reduce this, the heat exchanger is provided with a purging sector.
The purging sector is positioned on the side of the supply air, downstream of the rotor, at the point at which the rotor moves from the return to the supply side. It has to be positioned in such a way that it works with the differential pressure. A certain amount of the outdoor air will be transferred to the return when the rotor moves from the exhaust side to the supply side, thus permitting purging of the rotor to take place.
In many applications, the fact that part of the air is recycled is of no importance. Critical applications, on the other hand, such as operating-theaters in hospitals, call for rigorous control of the entrainment flows to prevent risk of contamination.

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To ensure the best performance, rotary heat exchangers require simple periodic maintenance including:
a) Cleaning of the equipment to get rid of accumulations of fiber, dust, etc;
b) Motor and electric controls check
c) Check of the tension of the transmission belts.

Operation and Maintenance



Recuperator S.p.A.
Rescaldina (MI) - Italy

Recuperator USA
PO Box 10084 - Lancaster, PA 17605
Tel: 717-299-5679 | Fax: 717-299-5679
Cell: 717-917-3635
Skype: scott.herr5
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