Description
For tunnel ventilation, understanding the airflow in the tunnel is of utmost importance. For modern road tunnel ventilation systems with flow control, precise and reliable online measurement of the flow velocity is essential. Precise acceptance test flow measurements in ducts and tunnels validate the ventilation system design and fan performance, determine calibration factors for installed anemometers for the online measurement, and determine and validate controller parameters for flow control.
This paper describes methods for installed online flow measurements in tunnels, and temporary measurements for on site acceptance testing, compares resulting precisions and uncertainties, advantages and disadvantages, and challenges encountered in practice.
