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Study of Radial Wall Jets from Ceiling Diffusers at Variable Air Volume

Author

Listed:
  • Maria Hurnik

    (Department of Heating, Ventilation and Dust Removal Technology, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 20, 44-100 Gliwice, Poland)

  • Jan Kaczmarczyk

    (Department of Heating, Ventilation and Dust Removal Technology, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 20, 44-100 Gliwice, Poland)

  • Zbigniew Popiolek

    (Department of Heating, Ventilation and Dust Removal Technology, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 20, 44-100 Gliwice, Poland)

Abstract

The knowledge of the air velocity distribution in the supply jets is essential when designing ventilation and air conditioning systems. In this study, we tested and analyzed the velocity distributions in the radial wall jets—these jets are commonly used in ventilated rooms. Tests included jets from two ceiling diffusers of different constructions, at three airflow rates. The mean air speed distributions were measured with a 16-channel hot-sphere anemometer both in the self-similarity zone and in the terminal zone. A specially developed method of converting the mean speed to mean velocity was used. The measurement results show that the spread coefficients of the jets from both diffusers were the same, but the positions of the virtual origin were different. Due to the friction of the jet with the ceiling and the transfer of momentum to the recirculating flows, the momentum flux in the self-similarity zone decreased by up to 50%. An improved method for calculating velocity distributions in radial wall jets was developed and validated. This method takes into account the decrease of momentum, non-zero position of the jet origin, and faster velocity decrease in the terminal zone. A reliable method of predicting air velocity distribution in radial wall jets (RWJs) from ceiling diffusers may allow to properly select the diffuser size, its location, and the range of flow rate changes. The design process for variable air volume systems can be facilitated.

Suggested Citation

  • Maria Hurnik & Jan Kaczmarczyk & Zbigniew Popiolek, 2021. "Study of Radial Wall Jets from Ceiling Diffusers at Variable Air Volume," Energies, MDPI, vol. 14(1), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:1:p:240-:d:474878
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    References listed on IDEAS

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    1. Arman Ameen & Mathias Cehlin & Ulf Larsson & Taghi Karimipanah, 2019. "Experimental Investigation of Ventilation Performance of Different Air Distribution Systems in an Office Environment—Heating Mode," Energies, MDPI, vol. 12(10), pages 1-13, May.
    2. Arman Ameen & Mathias Cehlin & Ulf Larsson & Taghi Karimipanah, 2019. "Experimental Investigation of the Ventilation Performance of Different Air Distribution Systems in an Office Environment—Cooling Mode," Energies, MDPI, vol. 12(7), pages 1-15, April.
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    Cited by:

    1. Kaijun Li & Linye Song & Xinghui Zhang & Qi Wang & Jing Hua, 2023. "Study of Influence of Boundary Condition of Diffuser with Non-Uniform Velocity on the Jet Characteristics and Indoor Flow Field," Energies, MDPI, vol. 16(3), pages 1-17, January.
    2. Marek Borowski & Rafał Łuczak & Joanna Halibart & Klaudia Zwolińska & Michał Karch, 2021. "Airflow Fluctuation from Linear Diffusers in an Office Building: The Thermal Comfort Analysis," Energies, MDPI, vol. 14(16), pages 1-19, August.
    3. Joanna Halibart & Klaudia Zwolińska & Marek Borowski & Marek Jaszczur, 2021. "Analysis of the Velocity Distribution in the Plenum Box with Various Entries," Energies, MDPI, vol. 14(12), pages 1-17, June.

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