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Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study

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  • Yat Huang Yau

    (Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
    UM-Daikin Laboratory, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

  • Umair Ahmed Rajput

    (Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
    UM-Daikin Laboratory, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
    Department of Mechanical Engineering, Quaid-e-Awam University of Engineering, Science and Technology (QUEST), Nawabshah 67480, Pakistan)

  • Altaf Hussain Rajpar

    (Department of Mechanical Engineering, College of Engineering, Jouf University, Sakaka 42421, Saudi Arabia)

  • Natalia Lastovets

    (Civil Engineering Unit, Tampere University, 33720 Tampere, Finland)

Abstract

A variable refrigerant flow integrated stratum ventilation (VRF-SV) system was proposed as an energy efficient substitute for conventional central cooling systems for buildings. The novel system provided conditioned air to enclosed spaces with high indoor air quality and thermal comfort. This study investigated the effects of different types of ASTDs on the performance of the VRF-SV hybrid system. The performance was experimentally evaluated with five air terminal types, including bar grille, double deflection grille, jet slot, perforated and drum louver diffusers. The evaluation was carried out using standard indices: temperature and velocity distribution, airflow pattern, effective draft temperature (EDT), air distribution performance index (ADPI), thermal sensation vote and comfort feedback survey. The results indicated that the ASTD type had a significant impact on airflow pattern. Furthermore, the bar grille diffuser provided the occupants with greater thermal comfort and acceptable indoor environment. Almost all the EDT values determined in the breathing zone in the case with bar grille diffuser found under the satisfactory range, i.e., −1.2 < K < 1.2. Based on these values, the ADPI for bar grille diffuser was calculated as 92.8%. Thus, the bar grille diffuser is recommended to be installed with the VRF-SV hybrid system in buildings.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1265-:d:745439
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    References listed on IDEAS

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    1. 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.
    2. Cristina Baglivo, 2021. "Dynamic Evaluation of the Effects of Climate Change on the Energy Renovation of a School in a Mediterranean Climate," Sustainability, MDPI, vol. 13(11), pages 1-22, June.
    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.
    4. Zheng, Chenxiao & You, Shijun & Zhang, Huan & Zheng, Wandong & Zheng, Xuejing & Ye, Tianzheng & Liu, Zeqin, 2018. "Comparison of air-conditioning systems with bottom-supply and side-supply modes in a typical office room," Applied Energy, Elsevier, vol. 227(C), pages 304-311.
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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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