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Study of the reactors of compression-absorption heat pump: modelling of change of phase mechanisms of a zeotropic binary fluid flowing as a falling film onto a vertical plate.

Etude du fonctionnement des réacteurs d'une pompe à chaleur à compression-absorption : modélisation des mécanismes de changement d'état d'un fluide binaire zéotrope s'écoulant en film tombant sur une plaque plane verticale.

Author(s) : LOTTIN O.

Type of monograph: Doctoral thesis

Summary

This thesis submitted in fulfilment of the requirements for the degree of Doctor, at the Mechanical and Energetic Department of the Henri Poincaré University, Nancy (France), studies the absorber and the desorber of an absorption-compression heat pump, which are falling film type reactors using vertical plates geometry. Two kinds of models with coupled heat and mass transfers are detailed. The first one is based on local equations using thermal and molecular diffusivities; it allows the calculation of Nusselt and Sherwood numbers. The second one is based on equations using heat and mass transfer coefficients. Both models give heat and mass flux in the liquid- and in the vapour solutions. The influence of the value of heat and mass coefficients that appear in the second model on the global performances of the absorption-compression cycle is presented. Some results are compared with measurements made on an experimental heat pump. A second experimental study is made to compare the efficiency of different corrugated plates used in the reactors. During the Sydney Congress of the IIR, September 19-24, 1999, the author was awarded the IIR James Joule Prize to Young Researchers for this work.

Details

  • Original title: Etude du fonctionnement des réacteurs d'une pompe à chaleur à compression-absorption : modélisation des mécanismes de changement d'état d'un fluide binaire zéotrope s'écoulant en film tombant sur une plaque plane verticale.
  • Record ID : 2000-0517
  • Languages: French
  • Publication: Université Henri Poincaré - France/France
  • Publication date: 1996/12
  • Source: Source: 273 p. (21 x 29.7); fig.; tabl.
  • Document available for consultation in the library of the IIR headquarters only.

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