Heat recovery types:
The following heat recovery types are considered:
· Category I: Recuperative heat exchangers (e.g. air-to-air plate or tube heat exchanger) cross flow or counter flow
· Category II: Regenerative heat exchangers (e.g. rotary or reciprocating heat exchanger)
· Extract Air-to-Outdoor Air heat pump for extract air heat recovery
Declared maximum air volume flowrate qv,max:
Air volume flow corresponding to the declared total pressure difference PtUd of the unit at the maximum setting for standard air conditions (20 °C, 101325 Pa)
Declared minimum air volume flowrate qv,min:
Air volume flow corresponding to ptUd/2 at the minimum setting for standard air conditions (20 °C, 101325 Pa)
Intermediate (reference) airflow rate qv,int:
Airflow rate (in m3/s) within the operating range of airflows declared by the participant
including the reference point.
The reference point is defined at ptUd/2 and 70 % of declared maximum air volume flow. If this point cannot be set, pressure shall remain at ptUd/2 and airflow shall be adjusted just over.
Maximum flow reference pressure ptUd:
Total unit pressure difference at which the maximum airflow rate is determined. It shall be 100 Pa. However, if it cannot be achieved, a total unit pressure difference at maximum flow rate shall be declared by the manufacturer.
Minimum and maximum setting:
Minimum and maximum Fan speed settings declared by the participant; for variable speed fan motor unit, participants have to declare the corresponding setting (percentage, voltage, etc.)
Intermediate Fan speed setting which include the reference point
Maximum air flow point:
Maximum air flow point shall be adjusted at ptUd and declared maximum air volume flow. If this point cannot be set, pressure shall be adjusted just over ptUd.
Airflow/pressure certified window:
All airflow/pressure points achievable on exhaust and supply side between 60% and 100% of the declared maximum air volume flowrate qv,max and with a total unit pressure difference equal or higher than ptUd/2.
Selection software and/or tables of data:
· available through a web address
· allowing retrieving all the points within the airflow/pressure certified window for both
the exhaust and the supply side
Technical documentation often includes diagrams of the airflow/pressure performances of the unit and performances published on Eurovent Certified Performance website.
Effective power input
Electric power input in watts at the reference point. It includes the electrical demands:
· for fans,
· controls (including remote controls)
· safety devices
· any power input for defrosting, excluding additional electrical heating devices not
used for defrosting;
· power input of the motor of the wheel for rotary heat echangers (the same speed as
the one used for the thermal test shall be used)
· power input of the heat pump in heating mode at 20(12)°C indoor air and 7(6)°C
Operation limit temperature TOL
Lowest outdoor temperature at which the unit can still function as declared by the