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Experimental study and steady-state modelling of a Commercial diffusion-absorption refrigerator

R. Mansouri 1,2, S. Mazouz 1, M. Bourouis 2 and A. Bellagi 1

1 U.R Thermique & Thermodynamique des Procédés Industriels, Ecole Nationale d’Ingénieurs de Monastir, ENIM, Avenue Ibn El Jazzar, 5019 Monastir, Université de Monastir, Tunisie.
2 Universitat Rovira i Virgili, Department of Mechanical Engineering, Av. Països Catalan N°26, 43000 Tarragona, Spain.

Abstract

Interest in diffussion-absorption technique for production of cold is noticed nowadays. The mono-pressure refrigeration system are heat powered and use a three-component working fluids mixture : ammonia-water-hydrogen. As there are no moving parts, these systems are both quiet and reliable and are therefore often used in hotel rooms and offices. We report in this paper on the results of an experimental study in stationary mode carried out on a low capacity commercial unit. The test are performed under different ambient air conditions and variable heat supplies. All the essential features of the machine (temperatures at various points, heat duty of different heat exchangers) are determined. Further, the experimental results are used as input data for a theoretical simulation model using the flow-sheeting software Aspen-Plus platform. Before running the simulation model a choice of the appropriate thermodynamic properties model has to be made. In our case, the Peng-Robinson equation of state with the modification of Boston-Mathias is adopted and used to regress LV water/ammonia equilibrium data. The final theoretical model is validated by comparing its predictions with the experimental data.

Keywords

Absorption-diffusion, Refrigeration, Modeling, Ammonia-water, Aspen-Plus, Performance.

Experimental study and steady-state modelling of a Commercial diffusion-absorption refrigerator
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