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Document IIF

Le renouveau du cycle de Rankine.

Auteurs : JAUMOTTE A.

Type d'article : Article, Article de la RIF

Résumé

Adaptations of the Rankine cycle to new appfications are described. The first move has been to increase the efficiency of thermal generating stations operation on fiquid fuels by using the combined gas turbine/steam turbine cycles. In these systems the steam produced is by the exhaust fumes of the high temperature gas turbine (1000°C). One has been able to increase the efficiency of the station to a very high value, ie 47% and it is expected that a figure of 50% is possible. There is also an attempt to use coal with these cycles by employing gas/tiers. The second move has been to use binary cycles consisting of a Rankine water cycle for the high temperature side and a Rankine ammonia cycle for the low temperature side, the cycles being/inked in cascade. These binary cycles enable one to. increase the maximum possible power for a given rotating speed of the machine, eliminate the problems of erosion which are encountered in low pressure steam turbines, and employ dry coolers by using low outside temperatures to the best advantage. The third line of research has been the adaptation of the Rankine cycle to producing mechanical or electrical energy from fairly low temperature heat such as recuperated heat or solar heat. After having pointed out system drawbacks in using water as the working fluid and the advantage of ammonia and fluorocarbon fluids, the report shows how to achieve the optima/cycle. A comparison is made between optimal cycles for NH3, R11 and R114. A description is given of a novel free-piston machine developed by D. Vokaer at the Institute for Applied Mechanics of the University of Brussels. The drive components of a Rankine cycle and the compressor of a refrigeration cycle are grouped in the same mechanical assembly. This system will produce refrigeration by heat from a fairly low temperature source (between 50° and 75°C). Performance curves are given for R114 producing cooling at 10°C for a range of ambient and hot source temperatures.

Documents disponibles

Format PDF

Pages : 285-293

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Le renouveau du cycle de Rankine.
  • Identifiant de la fiche : 30001025
  • Langues : Français
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 5 - n. 5
  • Date d'édition : 09/1982

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