Measurement of Small Air Velocities in Air-Conditioned Rooms; LOCATION = Europe;

Comfort in an air-conditioned room depends to a high degree on the prevailing movement of air. As air velocities in excess of 0.1 m/sec can be regarded as draft phenomenon, a measuring device has been developed which will facilitate measurement to a sufficient accuracy and independent of any fluctuations in the air temperature even with low velocities. The directional dependency is more or less ruled out through the utilization of a thermistor probe, and the inertia has been reduced to such an extent with constant temperature operation that the resulting turbulence can still be measured. A novel evaluation method facilitates conclusive and rational assessment of the flow conditions at a certain measuring point. With the aid of a simple digital data logger, it is possible to survey up to twenty measuring points at the same time.