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An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems

Author

Listed:
  • Nina Szczepanik-Scislo

    (Faculty of Environmental and Power Engineering, Cracow University of Technology, 24 Warszawska Str., 31-155 Krakow, Poland
    CERN, European Organization for Nuclear Research, Esplanade des Particules 1, 31-155 Geneva, Switzerland)

  • Jacek Schnotale

    (Faculty of Environmental and Power Engineering, Cracow University of Technology, 24 Warszawska Str., 31-155 Krakow, Poland)

Abstract

This study aimed to develop a new concept for an air terminal device for a VAV (variable air volume) ventilation system that would improve overall ventilation efficiency under a varying air supply volume. In VAV systems, air volume is modified according to the thermal load in each ventilated zone. However, lowering the airflow may cause a lack of proper air distribution and lead to the degradation of hygienic conditions. To combat this phenomenon, an air terminal device with an adapting geometry to stabilize the air throw, such that it remains constant despite the changing air volume supplied through the ventilation system, was designed and studied. Simulations that were performed using the RNG k–ε model in the ANSYS Fluent application were later validated on a laboratory stand. The results of the study show that, when using the newly proposed terminal device with an adaptive geometry, it is possible to stabilize the air throw. The thermal comfort parameters such as the PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied) proved that thermal comfort was maintained in a person-occupied area regardless of changing airflow though the ventilation system.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4947-:d:416759
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    References listed on IDEAS

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    1. Young-Hum Cho, 2012. "Development of a Terminal Control System with Variable Minimum Airflow Rate," Energies, MDPI, vol. 5(11), pages 1-22, November.
    2. Enescu, Diana, 2017. "A review of thermal comfort models and indicators for indoor environments," Renewable and Sustainable Energy Reviews, Elsevier, vol. 79(C), pages 1353-1379.
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    4. Pasut, Wilmer & Bauman, Fred & De Carli, Michele, 2014. "The use of ducts to improve the control of supply air temperature rise in UFAD systems: CFD and lab study," Applied Energy, Elsevier, vol. 134(C), pages 490-498.
    5. Okochi, Godwine Swere & Yao, Ye, 2016. "A review of recent developments and technological advancements of variable-air-volume (VAV) air-conditioning systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 784-817.
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    Cited by:

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    2. Yat Huang Yau & Umair Ahmed Rajput & Altaf Hussain Rajpar & Natalia Lastovets, 2022. "Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study," Energies, MDPI, vol. 15(4), pages 1-23, February.
    3. Nina Szczepanik-Scislo, 2022. "Improving Household Safety via a Dynamic Air Terminal Device in Order to Decrease Carbon Monoxide Migration from a Gas Furnace," IJERPH, MDPI, vol. 19(3), pages 1-11, February.
    4. Ling-Yi Chang & Tong-Bou Chang, 2023. "Air Conditioning Operation Strategies for Comfort and Indoor Air Quality in Taiwan’s Elementary Schools," Energies, MDPI, vol. 16(5), pages 1-19, March.

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