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CFD simulation of heat and mass transfer in an absorber that uses the pair ammonia/water as a working fluid.

Author(s) : LIMA A. A. S., OCHOA A. A. V., DA COSTA J. A. P., et al.

Type of article: Article, IJR article

Summary

Absorption refrigeration systems have been gaining ground in recent years, whether in industry or research. This is due to their consuming less electricity, which is their main advantage over the conventional steam compression system. This study reports the results of a numerical analysis of an absorber, one of the main components of absorption refrigeration systems, in terms of the phenomena of heat and mass transfer. The study was carried out using a flat plate configuration with downward fluid to model the absorber and the numerical simulation was performed using ANSYS-CFX software. In the model, equations that represent the conversion of energy and momentum were used as the basis for the analysis, in addition to which correlations describe the heat and mass transfer in the geometry studied. The results were compared with those in the literature, which presented errors of less than 10%, except for the mass fraction of the solution. A parametric analysis was performed to evaluate the behavior of the absorber when the concentrations of ammonia present in the absorbent solution, the flow of refrigerant vapor and the flow rate of the absorbent solution were varied. At the end of the study, among other results, it was found that a 10% increase in the mass fraction of ammonia at the inlet of the absorber leads to a 17.9% increase in the amount of ammonia present at the outlet of the absorber when compared to its inlet value, while a reduction of 10% in the mass fraction of ammonia at the inlet of the absorber causes an increase of 29.8%.

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Pages: 514-525

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Details

  • Original title: CFD simulation of heat and mass transfer in an absorber that uses the pair ammonia/water as a working fluid.
  • Record ID : 30025476
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 98
  • Publication date: 2019/02
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2018.11.010

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