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Design of a compact absorber with a hydrophobic membrane contactor at the liquid-vapor interface for lithium bromide-water absorption chillers

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  • Ali, Ahmed Hamza H.

Abstract

In this study, design of a compact plates-and-frames absorber possessing a hydrophobic microporous membrane contactor at the aqueous solution-water vapor interface is performed analytically. The absorber is a component of a 5Â kW cooling capacity single-effect lithium bromide-water absorption chiller that incorporates a hot water thermally driven generator and a water-cooled absorber and condenser. Good agreement prevailed for the analytically evaluated water vapor mass transfer flux and aqueous solution outlet temperature when compared with measured values at similar operating conditions. At design point conditions, the main design parameters obtained are a membrane contactor area of 6.06Â m2, a ratio of the mass transfer area to absorber net volume (Am/Vnet) of 130.1(m2/m3), and ratio of the membrane area (mass transfer area) in this design configuration to the area required for heat transfer is 1.162, respectively. The results clearly indicate that the aqueous solution channel thickness is the most significant design parameter that affects the absorber size compactness; the thinner the thickness of the solution channel, the higher the ratio (Am/Vnet). The results also show the countercurrent refrigerant flow with the aqueous solution has positive effects on the absorber size compactness.

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  • 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.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:4:p:1112-1121
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    1. Srikhirin, Pongsid & Aphornratana, Satha & Chungpaibulpatana, Supachart, 2001. "A review of absorption refrigeration technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(4), pages 343-372, December.
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    2. González-Gil, A. & Izquierdo, M. & Marcos, J.D. & Palacios, E., 2012. "New flat-fan sheets adiabatic absorber for direct air-cooled LiBr/H2O absorption machines: Simulation, parametric study and experimental results," Applied Energy, Elsevier, vol. 98(C), pages 162-173.
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    5. 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.
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    11. Mortazavi, Mehdi & Nasr Isfahani, Rasool & Bigham, Sajjad & Moghaddam, Saeed, 2015. "Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure," Energy, Elsevier, vol. 87(C), pages 270-278.
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    15. 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.
    16. 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.
    17. Balghouthi, M. & Chahbani, M.H. & Guizani, A., 2012. "Investigation of a solar cooling installation in Tunisia," Applied Energy, Elsevier, vol. 98(C), pages 138-148.

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