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Rotary heat exchangers
Certification manual
Certification Manual
Technical Certification Rules

Scope of the programme

This certification programme applies to all ranges of Air-to-Air Regenerative Heat Exchangers (including sealing systems) which are included in the certified public selection software of the Applicant/Participant. Units sold without casing and sealing systems are also included in the scope. The certify-all principle applies not only to Europe but to all markets.

Participants shall certify all models in the ranges, including:

  •  all classes:
    • condensation RHE = non hygroscopic RHE = non enthalpy RHE
    • hygroscopic RHE = enthalpy hygroscopic RHE
    • sorption RHE = enthalpy sorption RHE
  • all RHE geometry (wave height, foil thickness) 
  • all sizes (rotor diameters and rotor depths and surface areas of alternating storage matrices - ASM)
  • all materials
  • all airflow rates
  • all different types of sealing (if available)


Rotary Heat Exchanger: 
A Rotary Heat Exchanger is a device incorporating a rotating cylinder or wheel for the purpose of transferring energy (sensible or total) from one air stream to the other. It incorporates heat transfer material, a drive mechanism, a casing or frame, and includes any seals which are provided to retard the bypassing and leakage of air from one air stream to the other. 

Product Range: 
The Certification Programme applies to the Rotary Heat Exchanger classes “Condensation Rotor/non hygroscopic rotor”, “Enthalpy Rotor/hygroscopic rotor” and “Sorption Rotor”.

Pressure drop:
Loss in total pressure between the inlet and the outlet of the unit within one air stream.

Face air velocity:
Velocity of air entering the unit. It shall be calculated as follow :

Face air velocity

Wave length:
Mean length of the wave (bottom).
The mean length of one wave shall be obtained from the length of the arc corresponding to 10 waves. The following formula for the arc of a circle, L, shall be used: L= D*arcsin(c/D) with L the arc of the rotor, D the diameter, and c the chord.

Wave length

Wave height:
Mean height of one wave, including one flat foil thickness.

Wave height

with: t temperature
11 exhaust air inlet
12 exhaust air outlet
21 supply air inlet
22 supply air outlet

Humidity efficiency:
Ratio of absolute humidity differences:

Humidity efficiency

Temperature efficiency:
Ratio of temperature differences:

Temperature efficiency

Pressure drop:
Loss in total pressure between the inlet and the outlet of the unit within one air stream.

Exhaust Air Transfert Ratio (EATR):
Transfer of exhaust air into the supply air side in air to air regenerative heat exchanger.
EATR provides information on the level of contamination of the supply air by the exhaust air (percentage of the exhaust air in the supply air).

Exhaust Air Transfert Ratio (EATR)

Outdoor Air Correction Factor (OACF):
Ration of the enterinf supply mass airflow rate and the leaving supply mass airflow rate. This parameter can be used as a correction factor for the supply air fan:
     - If OACF > 1: the outdoor air mass flow is higher than the uspply air mass flow;
     - If OACF = 1: the outdoor air mass flow equals the supply air mass flow;
     - If OACF < 1: the outdoor air mass flow is lower than the supply air mass flow.

Outdoor Air Correction Factor (OACF)

Sorption regenerative heat exchanger:
Regenerative heat exchanger demonstrating a latent efficiency which is at least 70% of the temperature efficiency under all tested conditions with nominal airflow rate. Units having a lower humidity efficiency only can be certified as Enthalpy regenerative heat exchangers.

Certified characteristics

The following performance items shall be certified.

  • Under standard conditions (20°C, 50% rel. Humidity and 1.013105Pa - or 1.20 kg/m3)

-  Airflow
-  Pressure drop
-  Outdoor Air Correction Factor
-  Exhaust Air Transfer Ratio

  • Under "regular" winter conditions for all rotors

-  Temperature efficiency
-  Humidity efficiency

  • Under "regular" summer conditions for Enthlapy and Sorption rotors

-  Temperature efficiency
-  Humidity efficiency

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