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Adiabatic vs non-adiabatic membrane-based rectangular micro-absorbers for H2O-LiBr absorption chillers

Author

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  • Venegas, M.
  • de Vega, M.
  • García-Hernando, N.
  • Ruiz-Rivas, U.

Abstract

In this paper a microporous membrane is used in combination with rectangular microchannels in the absorber of an absorption chiller, working in two different configurations: cooled by a water flow and adiabatically. In the non-adiabatic case, the configuration of the channels allows the heat released during absorption to be extracted using a cooling water flow. The results for solution concentration, pressure potential, absorption coefficient, absorption rate, temperatures and power exchanged/stored by the working fluids along the absorption channels are presented. The ratio between the cooling power of the chiller equipped with the simulated absorber and the absorber volume, rqV, is used to characterise the absorber compactness. A parametric analysis is also performed to evaluate the influence on the ratio rqV of the inlet solution mass flow rate, the solution inlet temperature, and the height and width of the solution channels, for both absorbers. For the base case considered in this study, both absorber configurations offer rqV higher than 1 MW m−3. This ratio is higher than usual values found in falling film absorbers using conventional circular tubes. Moreover, the new adiabatic configuration presented has significant advantages respect to the non-adiabatic one in terms of higher rqV and fabrication simplicity.

Suggested Citation

  • Venegas, M. & de Vega, M. & García-Hernando, N. & Ruiz-Rivas, U., 2017. "Adiabatic vs non-adiabatic membrane-based rectangular micro-absorbers for H2O-LiBr absorption chillers," Energy, Elsevier, vol. 134(C), pages 757-766.
    • Handle: RePEc:eee:energy:v:134:y:2017:i:c:p:757-766
    DOI: 10.1016/j.energy.2017.06.068
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    References listed on IDEAS

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    1. Asfand, Faisal & Bourouis, Mahmoud, 2015. "A review of membrane contactors applied in absorption refrigeration systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 45(C), pages 173-191.
    2. Venegas, M. & de Vega, M. & García-Hernando, N. & Ruiz-Rivas, U., 2016. "A simple model to predict the performance of a H2O–LiBr absorber operating with a microporous membrane," Energy, Elsevier, vol. 96(C), pages 383-393.
    3. Asfand, Faisal & Stiriba, Youssef & Bourouis, Mahmoud, 2015. "CFD simulation to investigate heat and mass transfer processes in a membrane-based absorber for water-LiBr absorption cooling systems," Energy, Elsevier, vol. 91(C), pages 517-530.
    4. Bigham, Sajjad & Yu, Dazhi & Chugh, Devesh & Moghaddam, Saeed, 2014. "Moving beyond the limits of mass transport in liquid absorbent microfilms through the implementation of surface-induced vortices," Energy, Elsevier, vol. 65(C), pages 621-630.
    5. Ali, Ahmed Hamza H., 2010. "Design of a compact absorber with a hydrophobic membrane contactor at the liquid-vapor interface for lithium bromide-water absorption chillers," Applied Energy, Elsevier, vol. 87(4), pages 1112-1121, April.
    6. 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.
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    Cited by:

    1. 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.
    2. 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).
    3. Sui, Zengguang & Wu, Wei, 2022. "A comprehensive review of membrane-based absorbers/desorbers towards compact and efficient absorption refrigeration systems," Renewable Energy, Elsevier, vol. 201(P1), pages 563-593.
    4. Sui, Zengguang & Wu, Wei, 2023. "AI-assisted maldistribution minimization of membrane-based heat/mass exchangers for compact absorption cooling," Energy, Elsevier, vol. 263(PC).

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