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Absorption heat pump cycles using an ammonia-water mixture and linked in a material cascade.

Cycles de frigopompes à absorption en cascades matérielles : détermination du nombre d'étages optimal pour le mélange ammoniac-eau.

Author(s) : LAOUIR A., LE GOFF P., HORNUT J. M.

Type of article: Article, IJR article

Summary

This study is devoted to the modelling of absorption heat pumps using an ammonia-water mixture, for air conditioning. The mixture is separated in a distillation column and the components are remixed in a number of evaporation-absorption cells, linked in a material cascade. The authors compare the performance of three structures, with one, two or three stages, and they determine the influence of various parameters: final desorption temperature, cold source temperature, the number of theoretical separation plates, and the thermal pinch of the main exchanger. This last factor exerts only a small influence. The two-stage cycle appears to be the most efficient: it is even more efficient than the three-stage cycle. The higher rectification losses and recirculation rates for the three-stage cycle lower its performance. The three-stage cycle becomes the most efficient for the production of cold at a lower environmental temperature and will a greater number of theoretical separation plates.

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Pages: 136-148

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Details

  • Original title: Cycles de frigopompes à absorption en cascades matérielles : détermination du nombre d'étages optimal pour le mélange ammoniac-eau.
  • Record ID : 2002-1324
  • Languages: French
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 25 - n. 1
  • Publication date: 2002/01

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