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Experimental Study on the Performance of a Dew-Point Evaporative Cooling System with a Nanoporous Membrane

Author

Listed:
  • Jing Lv

    (School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Bo Zhou

    (School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Mengya Zhu

    (School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Wenhao Xi

    (School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Eric Hu

    (School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia)

Abstract

In this paper, a plate counter-flow dew-point evaporative cooling system was designed with a nanoporous membrane covered on the surface of the wet channel for enhancement of heat and mass transfer. First, the operating principle of this device and theoretical analysis of nanoporous membrane evaporation were discussed in detail. Then, the impacts of several operating parameters on cooling performance, mainly including inlet air temperature, humidity, velocity, and the effect of utilizing the membrane, were investigated in trials. It was found that the cooling performance can be improved by using membrane significantly. In the dry channel, the maximum temperature decrease can reach 12.5 °C. At a high inlet air temperature, the product air can be dropped to a lower temperature, contributing to a more significant heat transfer process. Lower humidity, on the other hand, resulted in a reduced product air temperature and a lower cooling efficiency. Under the condition of 50% humidity, the wet-bulb efficiency and dew-point efficiency were 1.09 and 0.79, respectively. With the inlet air velocity increasing from 1.5 m/s to 2 m/s, the outlet air temperature would rise, and the wet-bulb efficiency and dew-point efficiency would decrease. To achieve better cooling performance, inlet air velocity ought to be limited to a low speed.

Suggested Citation

  • Jing Lv & Bo Zhou & Mengya Zhu & Wenhao Xi & Eric Hu, 2022. "Experimental Study on the Performance of a Dew-Point Evaporative Cooling System with a Nanoporous Membrane," Energies, MDPI, vol. 15(7), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:7:p:2592-:d:785701
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    References listed on IDEAS

    as
    1. Sadighi Dizaji, Hamed & Hu, Eric Jing & Chen, Lei & Pourhedayat, Samira, 2018. "Development and validation of an analytical model for perforated (multi-stage) regenerative M-cycle air cooler," Applied Energy, Elsevier, vol. 228(C), pages 2176-2194.
    2. Maheshwari, G. P. & Al-Ragom, F. & Suri, R. K., 2001. "Energy-saving potential of an indirect evaporative cooler," Applied Energy, Elsevier, vol. 69(1), pages 69-76, May.
    3. Sadighi Dizaji, Hamed & Hu, Eric Jing & Chen, Lei, 2018. "A comprehensive review of the Maisotsenko-cycle based air conditioning systems," Energy, Elsevier, vol. 156(C), pages 725-749.
    4. Cui, X. & Chua, K.J. & Yang, W.M., 2014. "Numerical simulation of a novel energy-efficient dew-point evaporative air cooler," Applied Energy, Elsevier, vol. 136(C), pages 979-988.
    5. Sadighi Dizaji, Hamed & Hu, Eric Jing & Chen, Lei & Pourhedayat, Samira, 2020. "Analytical/experimental sensitivity study of key design and operational parameters of perforated Maisotsenko cooler based on novel wet-surface theory," Applied Energy, Elsevier, vol. 262(C).
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    Cited by:

    1. Ahmad Saleh & Deaa Aldeen Kanaan, 2023. "An Experimental Study of a Novel System Used for Cooling the Protection Helmet," Energies, MDPI, vol. 16(10), pages 1-19, May.

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