Abstract
The determination of turbulence intensity and air velocity distribution in the ventilated spaces are very important from the point of view of draught comfort. In most cases, in slot ventilated spaces tangential air distribution system is applied. There are several references investigating draught comfort in ventilated spaces. However, most of these studies do not consider the exact type of the air distribution system. Another relevant question is that average 40 [%] turbulence intensity given in standard EN 13779 for designing how depends on the tangential air distribution. In this paper the turbulence intensity and air velocity distribution were investigated by experimentally in case of applying tangential air distribution system. Results showed that turbulence intensity and air velocity distribution depends on the air distribution system. Furthermore, average 40 [%] turbulence intensity given in the standard is not always relevant.
Highlights
Introduction and theoretical backgroundAs we know, primary air introduced to the ventilated space makes indoor air move in a sensible and characteristic way
The determination of turbulence intensity and air velocity distribution in the ventilated spaces is very important from the point of view of discomfort caused by draught
In this paper the turbulence intensity and air velocity distribution were experimentally investigated in case of applying tangential air distribution system
Summary
Introduction and theoretical backgroundAs we know, primary air introduced to the ventilated space makes indoor air move in a sensible and characteristic way. In HVAC practice tangential air distribution systems using slot diffuser(s) are frequently used in comfort places and in industrial spaces [17] At this ADS supply air is usually injected at the edge of the occupied zone, generally along the wall, window, and floor or ceiling surface. The earliest study about draught comfort was written by Houghten et al in 1938, in which draught comfort was investigated with the help of subjects in case of nearly laminar airflow [5,6] They found that the higher the air temperature in the occupied zone, the less the percentage of the dissatisfied. A mathematical model was created in order to calculate the percentage of thedissatisfied with the draft At the beginning, this model was a function of average air velocity (v ) and temperature (t ) [2]. Later they have discovered that velocity fluctuation (vRMS) can influence draught comfort [7]
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