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Numerical investigation of the energy performance of a guideless irregular heat and mass exchanger with corrugated heat transfer surface for dew point cooling

Author

Listed:
  • Xu, Peng
  • Ma, Xiaoli
  • Diallo, Thierno M.O.
  • Zhao, Xudong
  • Fancey, Kevin
  • Li, Deying
  • Chen, Hongbing

Abstract

The paper presents an investigation into the energy performance of a novel irregular heat and mass exchanger for dew point cooling which, compared to the existing flat-plate heat exchangers, removed the use of the channel supporting guides and implemented the corrugated heat transfer surface, thus expecting to achieve the reduced air flow resistance, increased heat transfer area, and improved energy efficiency (i.e. Coefficient of Performance (COP)) of the air cooling process. CFD simulation was carried out to determine the flow resistance (K) factors of various elements within the dry and wet channels of the exchanger, while the ‘finite-element’ based ‘Newton-iteration’ numerical simulation was undertaken to investigate its cooling capacity, cooling effectiveness and COP at various geometrical and operational conditions. Compared to the existing flat-plate heat and mass exchangers with the same geometrical dimensions and operational conditions, the new irregular exchanger could achieve 32.9%–37% higher cooling capacity, dew-point and wet-bulb effectiveness, 29.7%–33.3% higher COP, and 55.8%–56.2% lower pressure drop. While undertaking dew point air cooling, the irregular heat and mass exchanger had the optimum air velocity of 1 m/s within the flow channels and working-to-intake air ratio of 0.3, which allowed the highest cooling capacity and COP to be achieved. In terms of the exchanger dimensions, the optimum height of the channel was 5 mm while its length was in the range 1–2 m. Overall, the proposed irregular heat and mass exchanger could lead to significant enhanced energy performance compared to the existing flat-plate dew point cooling heat exchanger of the same geometrical dimensions. To achieve the same amount cooling output, the irregular heat and mass exchanger had the reduced size and cost against the flat-plate ones.

Suggested Citation

  • Xu, Peng & Ma, Xiaoli & Diallo, Thierno M.O. & Zhao, Xudong & Fancey, Kevin & Li, Deying & Chen, Hongbing, 2016. "Numerical investigation of the energy performance of a guideless irregular heat and mass exchanger with corrugated heat transfer surface for dew point cooling," Energy, Elsevier, vol. 109(C), pages 803-817.
    • Handle: RePEc:eee:energy:v:109:y:2016:i:c:p:803-817
    DOI: 10.1016/j.energy.2016.05.062
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    References listed on IDEAS

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    1. Duan, Zhiyin & Zhan, Changhong & Zhang, Xingxing & Mustafa, Mahmud & Zhao, Xudong & Alimohammadisagvand, Behrang & Hasan, Ala, 2012. "Indirect evaporative cooling: Past, present and future potentials," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(9), pages 6823-6850.
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    Cited by:

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    5. Pandelidis, Demis & Anisimov, Sergey & Rajski, Krzysztof & Brychcy, Ewa & Sidorczyk, Marek, 2017. "Performance comparison of the advanced indirect evaporative air coolers," Energy, Elsevier, vol. 135(C), pages 138-152.
    6. Xu, Peng & Ma, Xiaoli & Zhao, Xudong & Fancey, Kevin, 2017. "Experimental investigation of a super performance dew point air cooler," Applied Energy, Elsevier, vol. 203(C), pages 761-777.
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    12. Yugang Wang & Xiang Huang & Li Li, 2018. "Comparative Study of the Cross-Flow Heat and Mass Exchangers for Indirect Evaporative Cooling Using Numerical Methods," Energies, MDPI, vol. 11(12), pages 1-14, December.
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    14. Cui, Yuanlong & Zhu, Jie & Zoras, Stamatis & Liu, Lin, 2021. "Review of the recent advances in dew point evaporative cooling technology: 3E (energy, economic and environmental) assessments," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
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    16. Akhlaghi, Yousef Golizadeh & Ma, Xiaoli & Zhao, Xudong & Shittu, Samson & Li, Junming, 2019. "A statistical model for dew point air cooler based on the multiple polynomial regression approach," Energy, Elsevier, vol. 181(C), pages 868-881.
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