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On the Ventilation Performance of Low Momentum Confluent Jets Supply Device in a Classroom

Author

Listed:
  • Harald Andersson

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

  • Alan Kabanshi

    (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

The performance of three different confluent jets ventilation (CJV) supply devices was evaluated in a classroom environment concerning thermal comfort, indoor air quality (IAQ) and energy efficiency. The CJV supply devices have the acronyms: high-momentum confluent jets (HMCJ), low-momentum confluent jets (LMCJ) and low-momentum confluent jets modified by varying airflow direction (LMCJ-M). A mixing ventilation (MV) slot jet (SJ) supply device was used as a benchmark. Comparisons were made with identical set-up conditions in five cases with different supply temperatures (T S ) (16–18 °C), airflow rates (2.2–6.3 ACH) and heat loads (17–47 W/m 2 ). Performances were evaluated based on DR (draft rating), PMV (predicted mean vote), ACE (air change effectiveness) and heat removal effectiveness (HRE). The results show that CJV had higher HRE and IAQ than MV and LMCJ/LMCJ-M had higher ACE than HMCJ. The main effects of lower T s were higher velocities, DR (HMCJ particularly) and HRE in the occupied zone as well as lower temperatures and PMV-values. HMCJ and LMCJ produce MV conditions at lower airflow rates (<4.2 ACH) and non-uniform conditions at higher airflow rates. LMCJ-M had 7% higher HRE than the other CJV supply devices and produced non-uniform conditions at lower airflow rates (<3.3 ACH). The non-uniform conditions resulted in LMCJ-M having the highest energy efficiency of all devices.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5415-:d:429256
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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. Mossolly, M. & Ghali, K. & Ghaddar, N., 2009. "Optimal control strategy for a multi-zone air conditioning system using a genetic algorithm," Energy, Elsevier, vol. 34(1), pages 58-66.
    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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    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.
    2. 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.

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