Air flow patterns and draught risk caused by the collision of supply jets
Sivula, Arttu; Maula, Henna; Koskela, Hannu; Hongisto, Valtteri (2023)
International Society of Indoor Air Quality and Climate (ISIAQ)
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Julkaisun pysyvä osoite on
In office buildings, complaints about the thermal environment are often related to temperature or sensation of draught. Some of the challenges in finding solutions when designing comfortable workspaces are related to the complexities of the air flow patterns. In this paper, the effect of the collision of supply air jets on the airflow pattern and the draught risk in a single office room were analysed. The experimental situation created for the study is a typical draught situation in offices, where high heat loads has led into increased cooling to sustain the room temperature at a desired level. This paper is part of a larger study on thermal comfort and the draught situation was created for the purposes of human experiment. The focus of this paper is in analysing the airflow pattern under the created draught conditions. The airflow pattern was visualized with smoke and quantified with physical measurements and the draught risk was calculated. The downfall jet from the colliding supply jets caused local maximum air speeds directly above the workstation and the calculated draught risk was above the recommended values. The results show the strong effect of convective airflows on air distribution.