Paper 4
An Experimental Analysis of the
Two-Zone Airflow Pattern Formed in a Room with Displacement Ventilation
Z. Trzeciakiewicz
Department of Heating, Ventilating and Dust Removal
Technology, Silesian University of Technology, Gliwice, Poland
Abstract
This paper presents the results of tests on the two-zone airflow
pattern that forms in a room with displacement ventilation under
conditions of various heat sources and airflow rates. The position of the
interface layer between the zones was determined experimentally by tracer
gas concentration measurement and by applying a plume model for a point
heat source. The following heat sources were used: a plume simulator, a
desk lamp, a computer, a round plate and a human body. Quasi-laminar
diffusers supplied the air. The test results show that, in order to define
the interface position in displacement ventilation where real extensive
heat sources are used, it is possible to apply the experimentally
completed model of a plume above a point heat source.
Key words: ventilation, convection, displacement, ventilation,
plume model, interface layer, tracer gas.
References
Mierzwinski S, Popiolek Z and Trzeciakiewicz Z: (1996)
"Experiments on two-zone airflow forming in sisplacement ventilation,
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Popiolek Z: (1981) "Problems of testing and mathematical modelling
of plumes above human body and other extensive heat sources",
A4-serien nr 54 In: Inst. for Uppvarmnings och Ventilationsteknik, Royal
Institute of Technology, Stockholm.
Popiolek Z, Trzeciakiewicz Z and Mierzwinski S: (1998)
"Improvement of a plume volume flux calculation method" Proc.
6th International Conference on Air Distribution in Rooms, ROOMVENT'98,
Stockholm, Sweden.
Sandberg M and Lindstrom S: (1987) "A model for ventilation by
displacement", Proc. ROOMVENT'87, Sess.3 Stockholm.
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