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Testing Method for Non-Isothermal Radial Wall Jets from Ceiling Diffusers Used in Building Ventilation

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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)

Abstract

Diffusers producing radial jets attached to the ceiling are most often used in ventilation and air conditioning systems. In building ventilation, the temperature of the jet supplying the air into the rooms is usually different to the surrounding air temperature. To save energy for air transportation during periods of low heat gains, the air flow should be reduced as low as possible, to about 20% of its nominal value. A significant decrease in the air flow supply in cooling mode may cause cold air dumping and, consequently, increase the risk of local discomfort due to drafts in the occupied zone. In this study, a method for assessing the effect of non-isothermality on the speed distribution of radial wall jets has been developed. The measured terminal speed isolines, W = 0.2 m/s, were compared with the isolines determined for isothermal jets. The test results have shown that, for radial wall jets supplying air at an Archimedes number higher than approximately 50 × 10 −4 , the risk of jet dumping is significant.

Suggested Citation

  • Maria Hurnik, 2025. "Testing Method for Non-Isothermal Radial Wall Jets from Ceiling Diffusers Used in Building Ventilation," Energies, MDPI, vol. 18(2), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:2:p:411-:d:1570048
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    References listed on IDEAS

    as
    1. Katarzyna Ratajczak & Łukasz Amanowicz & Katarzyna Pałaszyńska & Filip Pawlak & Joanna Sinacka, 2023. "Recent Achievements in Research on Thermal Comfort and Ventilation in the Aspect of Providing People with Appropriate Conditions in Different Types of Buildings—Semi-Systematic Review," Energies, MDPI, vol. 16(17), pages 1-55, August.
    2. Nina Szczepanik-Scislo & Jacek Schnotale, 2020. "An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems," Energies, MDPI, vol. 13(18), pages 1-20, September.
    3. 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.
    4. Weimin Wang & Jian Zhang & Michael R. Brambley & Benjamin Futrell, 2020. "Performance Simulation and Analysis of Occupancy-Based Control for Office Buildings with Variable-Air-Volume Systems," Energies, MDPI, vol. 13(15), pages 1-21, July.
    5. Łukasz Amanowicz & Katarzyna Ratajczak & Edyta Dudkiewicz, 2023. "Recent Advancements in Ventilation Systems Used to Decrease Energy Consumption in Buildings—Literature Review," Energies, MDPI, vol. 16(4), pages 1-39, February.
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