Anemometry and Flow

John  Frederiksen

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Anemometry and Flow

Measurement of air velocity is performed in connection with meteorological observations and testing of wind turbines, indoor climatic investigations, emission measurements and optimisation of ventilation systems.

How can the Anemometry Laboratory at DTI help you?

The Anemometry Laboratory offers calibration of air velocity meters in the range 0.05 - 30 m/s, e.g.

  • Thermo anemometers
  • Vane wheel anemometers
  • Pitot tubes with auxiliary measuring instrument
  • Velometers

To ensure the highest possible accuracy we use a wind tunnel at high velocities and a towing tank at low velocities.

The Anemometry Laboratory offers calibration of air flow meters in the range 0.4 - 300 l/min. See www.danak.dk registration No. 200 for detailed specifications of the calibration services and the current measuring capacities.

We perform special tests for customers in our wind tunnel, e.g. in cooperation with Danish Technological Institute’s centre for ventilation. In connection with this it will be possible to supplement with Laser Doppler Anemometry (LDA).

We also calibrate micro manometers in our Pressure laboratory.


Measuring ranges

At air velocities of 0.05 - 0.7 m/s the measurement uncertainties are:
+/- 0.02 m/s in the range 0.05 – 0.7 m/s
+/- 0.0083 to 0.046 m/s in the range 0.3 - 10 m/s
+/- 0.046 to 0.15 m/s in the range 10 - 30 m/s

At air flows of 0.4 - 300 l/min the measurement uncertainties are:
+/- 0.010 l/min + 0.025 *q by air flow 0.4 - 2l/min
+/- 0.081 l/min + 0.029 *q by air flow 1.5 - 300 l/min