Dec 7, 2022

With more than 10 years of expertise gained in Air-to-Air Regenerative Heat Exchangers certification, Eurovent Certita Certification constantly tries to improve the value of the programme, answering the needs of a growing and demanding market. Every year, certified Air-to-Air Regenerative Heat Exchangers are selected and tested in an independent laboratory, providing trustworthy test results. These tests are then checked against the selection tools in order to ensure the reliability of provided data.

In 2014, Eurovent Certita Certification decided to change the way the results are checked, and aligned the method with EN308:1997:

• Prior to 2014, the exhaust air inlet (11) and the supply air inlet (21) airflows were used as inputs in the selection tools.
• Since 2014, the exhaust air inlet (11) and supply air outlet (22) airflows have been used as inputs in the selection tools.

As the airflow on the supply air outlet (22) is usually lower than the airflow on the supply air inlet (21), due to the Outdoor Air Correction Factor[1] (OACF), the air velocity across the exchanger is lower: the calculation thus gives a better efficiency. Therefore it is more likely that the efficiency will be out of the certification tolerances (defined in Rating Standard RS 8/C/002-2016). These changes have impacted the certified performances. In particular, the certified efficiencies (both temperature and humidity) have globally decreased when the products have remained identical. By using this method, Eurovent Certita Certification is closer to the customers’ expectations, whose requirements are on the airflows coming from and to the building, and in line with the EN308:1997, as the performances are checked with balanced airflows (the tests are conducted in order to keep exhaust air inlet (11) and the supply air outlet (22) airflows balanced). 

[1] OACF; for more details, see Eurovent 17/11 - 2015: Guidelines for Heat Recovery