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Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure

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  • Mortazavi, Mehdi
  • Nasr Isfahani, Rasool
  • Bigham, Sajjad
  • Moghaddam, Saeed

Abstract

In this study, an absorber design suitable for the plate-and-frame absorber configuration is introduced. The design utilizes a fin structure installed on a vertical flat plate to produce a uniform solution film and minimize its thickness and to continuously interrupt the boundary layer. Using numerical models supported by experiments employing dye visualization, the suitable fin spacing and size and surface wettability are determined. The solution flow thickness is measured using the laser confocal displacement measurement technique. The new surface structure is tested in an experimental absorption system. A significantly high absorption rate (6 × 10−3 kg/m2s at a pressure potential of 700 Pa) is achieved in comparison with the conventional absorption systems. The effect of absorber water vapor pressure, solution flow rate, solution inlet concentration, cooling water inlet temperature and solution inlet temperature on the absorption rate is investigated. The proposed design provides a potential framework for development of highly compact absorption refrigeration systems.

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  • 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.
    • Handle: RePEc:eee:energy:v:87:y:2015:i:c:p:270-278
    DOI: 10.1016/j.energy.2015.04.074
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    References listed on IDEAS

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    Cited by:

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    11. Lazcano-Véliz, Y. & Hernández, J.A. & Juárez-Romero, D. & Bourouis, Mahmoud & Coronas, Alberto & Siqueiros, J., 2017. "Energy efficiency assessment in the generator of an absorption heat transformer from measurement falling film thickness on helical coils," Applied Energy, Elsevier, vol. 208(C), pages 1274-1284.
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    13. Gluesenkamp, Kyle R. & Chugh, Devesh & Abdelaziz, Omar & Moghaddam, Saeed, 2017. "Efficiency analysis of semi-open sorption heat pump systems," Renewable Energy, Elsevier, vol. 110(C), pages 95-104.
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