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Experimental parameter study and correlation development of microchannel membrane-based absorption process for efficient thermal cooling with high compactness

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  • Zhai, Chong
  • Wu, Wei

Abstract

The microchannel membrane-based absorber occupies a crucial position in an efficient and compact absorption refrigeration system, as it directly influences the system's cooling capacity. However, existing numerical models for describing the absorption process of this absorber often exhibit large deviations, as they are adopted from other processes. To establish highly accurate correlations, extensive experiments are performed in this study to evaluate the absorption process using H2O/LiBr as the working fluids across a wide range of operating conditions. The experimental results demonstrate that enlarging the solution flow rate, vapor pressure, and solution concentration or lowering the cooling water temperature can improve the heat and mass transfer processes significantly. By analyzing the experimental results, new correlations of Nusselt number (Nu), Sherwood number (Sh), and friction factor (f) are developed for heat/mass transfer and solution pressure drop, respectively. It is verified that these newly developed correlations significantly enhance the prediction accuracy of the overall heat transfer coefficient (U), absorption rate (J), and pressure drop (DP) by 72.39%, 78.55%, and 64.56% when compared to existing literature correlations. The exceptional accuracy achieved by these correlations contributes significantly to the design, evaluation, and optimization of efficient and compact absorbers, enabling further advancements in this field.

Suggested Citation

  • Zhai, Chong & Wu, Wei, 2023. "Experimental parameter study and correlation development of microchannel membrane-based absorption process for efficient thermal cooling with high compactness," Energy, Elsevier, vol. 279(C).
  • Handle: RePEc:eee:energy:v:279:y:2023:i:c:s0360544223014743
    DOI: 10.1016/j.energy.2023.128080
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    References listed on IDEAS

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    1. Zhai, Chong & Wu, Wei, 2021. "Performance optimization and comparison towards compact and efficient absorption refrigeration system with conventional and emerging absorbers/desorbers," Energy, Elsevier, vol. 229(C).
    2. Waite, Michael & Cohen, Elliot & Torbey, Henri & Piccirilli, Michael & Tian, Yu & Modi, Vijay, 2017. "Global trends in urban electricity demands for cooling and heating," Energy, Elsevier, vol. 127(C), pages 786-802.
    3. Zhai, Chong & Wu, Wei & Coronas, Alberto, 2021. "Membrane-based absorption cooling and heating: Development and perspectives," Renewable Energy, Elsevier, vol. 177(C), pages 663-688.
    4. Nasr Isfahani, Rasool & Bigham, Sajjad & Mortazavi, Mehdi & Wei, Xing & Moghaddam, Saeed, 2015. "Impact of micromixing on performance of a membrane-based absorber," Energy, Elsevier, vol. 90(P1), pages 997-1004.
    5. Song, Joo Young & Lee, Jae Won & Kang, Yong Tae, 2019. "Comparisons of Nu correlations for H2O/LiBr solution in plate heat exchanger for triple effect absorption chiller application," Energy, Elsevier, vol. 172(C), pages 852-860.
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    1. Lisong Wang & Lijuan He & Yijian He, 2024. "Review on Absorption Refrigeration Technology and Its Potential in Energy-Saving and Carbon Emission Reduction in Natural Gas and Hydrogen Liquefaction," Energies, MDPI, vol. 17(14), pages 1-51, July.
    2. Zhai, Chong & Wu, Wei, 2024. "A compact modular microchannel membrane-based absorption thermal energy storage system for highly efficient solar cooling," Energy, Elsevier, vol. 294(C).

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