Heat and Mass Transfer in a Falling Film Evaporator with Aqueous Lithium Bromide Solution

7th European Thermal-Sciences Conference

Olbricht, M.^1 ; Addy, J.^1 ; Luke, A.^1

Institute of Technical Thermodynamics, University of Kassel, Kurt-Wolters-Strae 3, Kassel

34125, Germany^1

关键词: Absorption chillers;    Aqueous lithium bromide;    Experimental investigations;    Falling film;    Falling film evaporators;    Heat and mass transfer;    Horizontal tubes;    Low pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032056/pdf
DOI  :  10.1088/1742-6596/745/3/032056

来源: IOP

【 摘 要 】

Horizontal tube bundles are often used as falling film evaporators in absorption chillers, especially for systems working at low pressure as H2O/LiBr. Experimental investigations are carried out in a falling film evaporator consisting of a horizontal tube bundle with eighty horizontal tubes installed in an absorption chiller because of a lack of consistent data for heat and mass transfer in the literature. The heat and mass transfer mechanisms and the flow pattern in the falling film are analysed and compared with correlations from literature. The deviations of the experimental data from those of the correlations are within a tolerance of 30%. These deviations may be explained by a change of the flow pattern at a lower Reynolds number than compared to the literature.