Experimental analysis of the velocity field of the air flowing through the swirl diffusers

Jaszczur, Marek; Branny, Marian; Karch, M.; Borowski, Marek

doi:10.1088/1742-6596/745/3/032049

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…The laser's operating frequency ranged from 1 Hz to 15 Hz and for current purposes frequency 7 Hz was used. The measuring set-up was described in more detail in [2,5,6]. Measurements were made for four values of the average volumetric airflow rate through the diffuser: 100, 185, and 380 m 3 /h.…”

Section: Methodsmentioning

confidence: 99%

Numerical and experimental analysis of the velocity field of air flowing through swirl diffusers

et al. 2019

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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].

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Section: Methodsmentioning

confidence: 99%

Numerical and experimental analysis of the velocity field of air flowing through swirl diffusers

et al. 2019

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“…It was found that the lobbed one can provide a better air distribution, influencing positively the thermal stratification. The performance of air swirl diffusers characterized by different blades' angles were analysed in (Jaszczur et al 2016, Pandey et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Environmental parameters assessment of a new diffuser for air cooling/heating system: Measurements and numerical validation

2021

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Air distribution of HVAC systems is the most popular type used in the building sector, having a relevant impact on indoor air quality and occupant wellness. The balance between guaranteeing indoor thermal comfort and reducing energy consumption has become a significant issue in the last years, especially connected to the building construction. In line with this, this research investigates the potentialities of a new air diffuser type, installed in the ceiling of an exhibition room. This system provides a variable mass flow rate thanks to its configuration, allowing to determinate a good thermal comfort. A warm wall is chosen as the heating system. Several tests are carried out, six for cooling and two for heating with different volumetric air rate and supply air temperature of the diffusers. The combination of two methods, the measurements campaigns and the Computational Fluid Dynamics techniques, allows studying the thermal indoor environment. In general, results show a strong capability of this diffuser to provide a uniform temperature and velocity field inside the room. Moreover, experimental and numerical data are significantly comparable giving an average deviation of 1% for the velocity and lower 1% for the temperature. According to this, it is evident that the design of INDULINE allows to obtain optimal temperature and velocity distribution on the vertical and horizontal planes.

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“…With the growing share of energy consumption, heat recovery seems to be essential solutions able to save significant amounts of energy [2][3][4]. However, this required a new solution for ventilation able to maintain the desired indoor air quality [5,6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the temperature, humidity, and total efficiency of the air handling unit with a periodic counterflow heat exchanger

et al. 2019

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Original scientific paper https://doi.org/10.2298/TSCI19S4175JIn this work, thermal, humidity and enthalpy recover efficiency of innovative energy recovery exchanger is presented. The system under analysis allows adjustment of the humidity recovery especially useful in the winter period and forefend energy use for an anti-froze system of energy exchanger. It is shown that the presented method can achieve the real value for humidity and thermal efficiency above 80% and 90%, respectively. Such high efficiency was possible to obtain because the proposed system does not require energy consuming anti-freeze systems. The presented system is able to work even in extremely adverse outdoor air conditions (-20 °C and humidity 100%).

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Experimental analysis of the velocity field of the air flowing through the swirl diffusers

Cited by 8 publications

References 7 publications

Numerical and experimental analysis of the velocity field of air flowing through swirl diffusers

Numerical and experimental analysis of the velocity field of air flowing through swirl diffusers

Environmental parameters assessment of a new diffuser for air cooling/heating system: Measurements and numerical validation

Analysis of the temperature, humidity, and total efficiency of the air handling unit with a periodic counterflow heat exchanger

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