Abstract
In HVAC practice in slot ventilated spaces tangential air distribution systems are generally used. The determination of average air velocity and turbulence intensity is most important from the point of view of draught comfort, of effective and economical ventilation. In this paper the changing of the average air velocity, turbulence intensity and the relative average air velocity at different measurement heights were investigated considering the connection between these quantities in a slot ventilated space. Both the average air velocity and turbulence intensity determine the draught rate (DR), which affects draught comfort in ventilated spaces. Using the experimental investigation method we found that the changing of the average air velocity and turbulence intensity at the relevant heights may depend on the tangential air distribution system.
Highlights
Introduction and theoretical backgroundIn the slot ventilated spaces usually tangential air distribution system are frequently used
In this paper the changing of the average air velocity, turbulence intensity and the relative average air velocity at different measurement heights were investigated considering the connection between these quantities in a slot ventilated space
Using the experimental investigation method we found that the changing of the average air velocity and turbulence intensity at the relevant heights may depend on the tangential air distribution system
Summary
4.1 Changing of the average air velocity in the occupied zone Using the measured values at the relevant points - according to the previous section - the changing of the average air velocity can be investigated. It is clear that near the floor (at y = 0.1 m height) the average air velocity is almost constant on the whole measurement plane. Under the air inlet (position “a”) this velocity component is a little bit higher than in the whole occupied zone. This phenomenon contains the measurement error of the velocity measurements; it has not got any importance from the point of view of our results. Changing of the average air velocity (vm) in the occupied zone at V0 = 139 [m3/h], y = 0,1 [m]
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