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Article Dans Une Revue International Journal of Heat and Mass Transfer Année : 2017

Experimental and numerical study of a falling film absorber in an ammonia-water absorption chiller

Résumé

In this paper,experimental and numerical studies of heat and mass transfer in a falling film absorber are presented. The investigated absorber is a plate heat exchanger used ina falling film configuration. The ammonia-water solution flows in a falling film mode along the plates. The vapour flows co-current with the falling film and the coolant fluid is in a counter-current flow with the falling film. A prototype of ammonia-water absorption chiller isused to experimentally study the absorber behaviour in real operating conditions. Amacro study of the absorber and a local analysis deduced from local temperatures measurements along the falling film are presented. A numerical model and a simulation tool aredeveloped in order to complete the experimental investigations.The associatednumerical parametric studyaims to separatethe coolant mass flow rate impact.The model is validated with experimental dataand a maximal relative error of 15 % is observedbetween experimental and numerical results. The results of this study suggest that during the absorption process,mass transfers are controlled by the falling film mass transfer resistance and that the liquid-side heat transfer resistance is negligible.
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Dates et versions

hal-01717882 , version 1 (24-10-2019)

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Delphine Triché, Sylvain Bonnot, Maxime Perier-Muzet, François Boudéhenn, Hélène Demasles, et al.. Experimental and numerical study of a falling film absorber in an ammonia-water absorption chiller. International Journal of Heat and Mass Transfer, 2017, 111, pp.374-385. ⟨10.1016/j.ijheatmasstransfer.2017.04.008⟩. ⟨hal-01717882⟩
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