Journal
ENERGY AND BUILDINGS
Volume 42, Issue 1, Pages 34-42Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2009.07.008
Keywords
Chilled beam; Thermal plume; Air diffusion; Convection flow; Draught risk
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A passive chilled beam is a source of natural convection, creating a flow of cold air directly into the occupied zone. Experiments were conducted in a mock-up of an office room to study the air velocities in the occupied spaces. In addition, velocity profiles are registered when underneath heat loads exist and the cool and warm air flows interact. Experimental laboratory study revealed that in the case of the underneath heat gains, even no upward plume was generated and the dummy only acted as a flow obstacle, having a significant effect on the velocity profile. Furthermore, in an actual occupied office environment, the thermal plumes and the supply air diffuser mixed effectively the whole air volume. The maximum air velocity measured was still below 0.25 m/s with the extremely high heat gain of 164 W/m(2). The results demonstrate that analysis methods were the interaction of convection flow and jet are not taken into account could not accurately describe air movement and draught risk in the occupied room space. (C) 2009 Published by Elsevier B.V.
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