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Thermal Comfort and Energy Analysis of a Hybrid Cooling System by Coupling Natural Ventilation with Radiant and Indirect Evaporative Cooling

Author

Listed:
  • Pradeep Shakya

    (SJ-NTU Corporate Lab, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore)

  • Gimson Ng

    (SJ-NTU Corporate Lab, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore)

  • Xiaoli Zhou

    (SJ-NTU Corporate Lab, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore)

  • Yew Wah Wong

    (S-Lab for Advanced Intelligence, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore)

  • Swapnil Dubey

    (Energy Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore)

  • Shunzhi Qian

    (School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore)

Abstract

A hybrid cooling system which combines natural ventilation with a radiant cooling system for a hot and humid climate was studied. Indirect evaporative cooling was used to produce chilled water at temperatures slightly higher than the dew point. With this hybrid system, the condensation issue on the panel surface of a chilled ceiling was overcome. A computational fluid dynamics (CFD) model was employed to determine the cooling load and the parameters required for thermal comfort analysis for this hybrid system in an office-sized, well-insulated test room. Upon closer investigation, it was found that the thermal comfort by the hybrid system was acceptable only in limited outdoor conditions. Therefore, the hybrid system with a secondary fresh air supply system was suggested. Furthermore, the energy consumptions of conventional all-air, radiant cooling, and hybrid systems including the secondary air supply system were compared under similar thermal comfort conditions. The predicted results indicated that the hybrid system saves up to 77% and 61% of primary energy when compared with all-air and radiant cooling systems, respectively, while maintaining similar thermal comfort.

Suggested Citation

  • Pradeep Shakya & Gimson Ng & Xiaoli Zhou & Yew Wah Wong & Swapnil Dubey & Shunzhi Qian, 2021. "Thermal Comfort and Energy Analysis of a Hybrid Cooling System by Coupling Natural Ventilation with Radiant and Indirect Evaporative Cooling," Energies, MDPI, vol. 14(22), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7825-:d:685342
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    References listed on IDEAS

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    1. Yu, Tao & Heiselberg, Per & Lei, Bo & Zhang, Chen & Pomianowski, Michal & Jensen, Rasmus, 2016. "Experimental study on the dynamic performance of a novel system combining natural ventilation with diffuse ceiling inlet and TABS," Applied Energy, Elsevier, vol. 169(C), pages 218-229.
    2. Nomura, Mika & Hiyama, Kyosuke, 2017. "A review: Natural ventilation performance of office buildings in Japan," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 746-754.
    3. Yang, Liu & Yan, Haiyan & Lam, Joseph C., 2014. "Thermal comfort and building energy consumption implications – A review," Applied Energy, Elsevier, vol. 115(C), pages 164-173.
    4. Adrian Roderick Escombe & David A J Moore & Jon S Friedland & Carlton A Evans & Robert H Gilman, 2007. "Natural Ventilation for Prevention of Airborne Contagion: Authors' Reply," PLOS Medicine, Public Library of Science, vol. 4(5), pages 1-2, May.
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    Cited by:

    1. Carlos J. Esparza-López & Carlos Escobar-del Pozo & Karam M. Al-Obaidi & Marcos Eduardo González-Trevizo, 2022. "Improving the Thermal Performance of Indirect Evaporative Cooling by Using a Wet Fabric Device on a Concrete Roof in Hot and Humid Climates," Energies, MDPI, vol. 15(6), pages 1-18, March.
    2. Minzhi Ye & Ahmed A. Serageldin & Katsunori Nagano, 2023. "Numerical and Parametric Study on Open-Type Ceiling Radiant Cooling Panel with Curved and Segmented Structure," Energies, MDPI, vol. 16(6), pages 1-20, March.

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