Abstract
The air swirl diffusers are popular for the ceiling level air supply system and have been widely used for Indoor Air Quality. They are nowadays one of the most popular diffusers commonly used in airconditioning systems [1, 2]. The swirl diffusers are intended to use in low- and medium-pressure ventilation systems. They allow for obtaining the swirl airflow and are especially recommended to use in spaces with the height from 3m up to 12m, where heating and cooling is performed by the ventilation system and where the exact setting of supply air velocity is important [3-6]. In the case of swirl diffusers,fluid flow is usually significantly influenced by the characteristics of different diffuser designs. In the ventilation system design phase, a typically focus on ventilation effectiveness and takes into account a large number of parameter. However, the discrepancy between design and practice are often experienced mainly because operating conditions don’t correspond to the designing conditions [7-9]. Inthis work, the airflow of swirl diffuser has been studied using Particle Image Velocimetry (PIV) method to analyse the mean airflow and geometry influence on the results. The paper presents a comparison of the results of velocity field measurements using the PIV method and the results obtained by means ofnumerical analysis CFD. Based on the analysis the velocity flow field was evaluated and the range of effective operation of the diffuser have been determined [10].
Highlights
The efficiency of the ventilation system depends on the proper distribution of air in the room
The comparison of these distributions shows that for all Reynolds numbers there is an approximate similarity between normed velocity fields
Application of Particle Image Velocimetry measurements showed the advantages of this method over “standard” methods in areas related to flow field determination in ventilated area
Summary
The efficiency of the ventilation system depends on the proper distribution of air in the room. To ensure the necessary conditions, the required ventilation effects can be determined in various ways. You can specify the spatial temperature distribution and range of air velocity in a certain zone or in the whole room. The distribution of pollutant concentrations can be determined. Given are recommendations for a geometric division of the room into zones with defined values of flow and thermal parameters. The expected effects of ventilation should be related to the impact of local factors in a given facility. Determination of the required ventilation effects is based on the indication of a significant and measurable effect of air separation [1, 2]
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