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A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room

Author

Listed:
  • Harald Andersson

    (Department of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, Sweden)

  • Mathias Cehlin

    (Department of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, Sweden)

  • Bahram Moshfegh

    (Department of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, Sweden
    Division of Energy Systems, Department of Management and Engineering, Linköping University, 58183 Linköping, Sweden)

Abstract

In this study, confluent jets ventilation (CJV) supply devices with three different nozzle arrays (1 × 19, 2 × 19, 3 × 19) were investigated both numerically and experimentally at two different airflow and supply air temperature set-ups. The performance of the CJV supply devices was investigated concerning thermal comfort, indoor air quality (IAQ), and heat removal effectiveness in a conference room environment. A comparison between the experimental and numerical results showed that the ϑ 2 ¯ − f model had the best agreement out of the investigated turbulence models. The numerical results showed that the size of the array had a great impact both on near-field development and on the conditions in the occupied zone. A larger array with multiple rows and a lower momentum conserved the inlet temperature and the mean age of the air better than a single-row array with a higher momentum. A larger array with multiple rows had a higher IAQ and a greater heat removal effectiveness in the occupied zone because the larger array conserved the mean age of air better and the buoyancy driven flow was slightly better at removing the heat. Because of the lower inlet velocities, they also had lower velocities at ankle level, which decreased the risk of draft and thermal discomfort.

Suggested Citation

  • Harald Andersson & Mathias Cehlin & Bahram Moshfegh, 2022. "A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room," Energies, MDPI, vol. 15(5), pages 1-30, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1630-:d:755841
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    References listed on IDEAS

    as
    1. Harald Andersson & Alan Kabanshi & Mathias Cehlin & Bahram Moshfegh, 2020. "On the Ventilation Performance of Low Momentum Confluent Jets Supply Device in a Classroom," Energies, MDPI, vol. 13(20), pages 1-24, October.
    2. 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.
    3. 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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    Citations

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    Cited by:

    1. John Kaiser Calautit & Hassam Nasarullah Chaudhry, 2022. "Sustainable Buildings: Heating, Ventilation, and Air-Conditioning," Energies, MDPI, vol. 15(21), pages 1-5, November.

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