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In France, the control of ventilation system at commissioning is mandatory in the context of the Effinergie + label and the measurement of airflows in residential houses is mandatory since 2017 in this label. The Promevent project (2013-2016) was aiming at improving the reliability of those controls. Guidelines have been issued for visual inspection of system, airflow measurements at air terminal devices (ATD) and ductwork airtightness measurements.
However, pending issues remained to measure airflow at supply ATD of balanced systems. This article deals with new tests performed at supply ATD.
Tests were made in laboratory (calibration like) and on site. Different anemometer hoods (single point hot wire, hot wire grids, propeller, powered hood...) were used.
Those tests have shown that :
- measures at supply are less reliable when ATD has uni-directional jet.
- the most suitable hood depends on its technology as well as its ability to measure small airflows.
- the ductwork accessories prior to the ATD also have an impact on results.
Resulting uncertainty is given as well as recommendations for measurements on site.