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A simple model to predict the performance of a H2O–LiBr absorber operating with a microporous membrane

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

Abstract

A microporous membrane is used in combination with rectangular microchannels in the absorber of an absorption chiller with the aim of reducing the size of this cooling technology. The simulation of the heat and mass transfer between the solution and the vapour phase in a H2O–LiBr absorber using porous fibres is considered. Heat and mass transfer processes are modelled by means of selected correlations and data gathered from the open literature. This new model is applied for the simulation of the absorber under typical operating conditions of absorption cooling chillers. Absorption rate, heat and mass transfer coefficients, solution concentration, temperatures of the working fluids and pressure potential along the absorption channels are calculated. For the case considered in this study, the absorber channels are of 5 cm length, offering a maximum ratio between cooling capacity of the chiller and absorber volume of 1090 kW/m3. This ratio is higher than twice the usual values found in falling film absorbers using conventional circular tubes. The mean absolute error between the model results and the experimental data gathered from the open literature is 8.5%, showing the capability of the model to predict the performance of membrane-based absorbers.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:96:y:2016:i:c:p:383-393
    DOI: 10.1016/j.energy.2015.12.059
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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. 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.
    3. 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.
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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. Sui, Zengguang & Sui, Yunren & Wu, Wei, 2022. "Multi-objective optimization of a microchannel membrane-based absorber with inclined grooves based on CFD and machine learning," Energy, Elsevier, vol. 240(C).
    3. Zhai, Chong & Wu, Wei, 2022. "Energetic, exergetic, economic, and environmental analysis of microchannel membrane-based absorption refrigeration system driven by various energy sources," Energy, Elsevier, vol. 239(PB).
    4. 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).
    5. 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.
    6. Sui, Zengguang & Zhai, Chong & Wu, Wei, 2022. "Parametric and comparative study on enhanced microchannel membrane-based absorber structures for compact absorption refrigeration," Renewable Energy, Elsevier, vol. 187(C), pages 109-122.
    7. 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.

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