Hautalampi T, Sandberg E, Koskela H
Bibliographic info:
in: "Progress in Modern Ventilation", Proceedings of Ventilation 2000, Volume 2, proceedings of the 6th International Symposium on Ventilation for Contaminant Control, held Helsinki, Finland, 4-7 June 2000, Finnish Institute of Occupational Health

This study is a part of a research project called 'Convective Flows and Vertical Temperature Gradient within Active Displacement Air Distribution'. The project and the two zone model developed have been introduced by Sandberg (1). The aim of this study was to examine the ventilation effectiveness with different elevations and horizontal positions of the heat sources within active displacement air distribution. This was studied by carrying out experiments using convective heaters and ordinary fluorescent tube lamps at several elevations as heat sources. · The influence of the lamps is an important factor, because in most of the practical installations their effect is considerable. The measurements were carried out by varying the level of the lights and the subtemperature of the supply air. Two types of air distribution were used, the air distribution upwards (=nozzles in a 240° sector on the surface of the device) and the all around (==nozzles in a 360° sector). The effect of the placement and the number of the convective heaters were examined with the air distribution upwards and the constant air flow rate. The air flow rate of the undisturbed convector plume was measured and modelled earlier (4).