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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

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

Authors

Thierno M. O. Diallo

Peng Xu

Hongbing Chen

Deying Li



Abstract

© 2016 The Author(s) 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.

Journal Article Type Article
Publication Date Aug 15, 2016
Journal Energy
Print ISSN 0360-5442
Electronic ISSN 1873-6785
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 109
Pages 803-817
APA6 Citation Diallo, T. M. O., Fancey, K., Ma, X., Xu, P., Zhao, X., Chen, H., & Li, D. (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, 109, 803-817. https://doi.org/10.1016/j.energy.2016.05.062
DOI https://doi.org/10.1016/j.energy.2016.05.062
Keywords Evaporative cooling, Dew point cooling, Heat and mass exchanger, Heat and mass transfer, Simulation, Energy performance
Publisher URL http://www.sciencedirect.com/science/article/pii/S036054421630679X
Copyright Statement © 2016 The Author(s). Published by Elsevier Ltd.
Additional Information This is a copy of an open access article which has been published in: Energy, 2016, v.109.

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Copyright Statement
© 2016 The Author(s). Published by Elsevier Ltd.



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