A Novel Method to Measure the Air Entrainment Ratio of an Active Chilled Beam

This paper presents a new simplified method to measure the air entrainment ratio of an active chilled beam or induction unit. The method uses a single anemometer and a simple purpose built measurement venturi together with the primary airflow rate. The new method is described and its calibration procedure is explained. Measured results are compared with results obtained according to European Standard prEN15116 with two extra sensors measuring the after coil air temperature. Results show that the new rectangular venturi method produces reliable and consistent results.