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Cycle transcritique au CO2 et cycle organique de Rankine utilisant le R-123 comme fluide actif dans la récupération de chaleur : étude comparative.

A comparative study of the carbon dioxide transcritical power cycle compared with an organic Rankine cycle with R-123 as working fluid in waste heat recovery.

Auteurs : CHEN Y., LUNDQVIST P., JOHANSSON A., et al.

Type d'article : Article

Résumé

The organic Rankine cycle (ORC) as a bottoming cycle to convert low-grade waste heat into useful work has been widely investigated for many years. The CO2 transcritical power cycle, on the other hand, is scarcely treated in the open literature. A CO2 transcritical power cycle (CO2 TPC) shows a higher potential than an ORC when taking the behaviour of the heat source and the heat transfer between heat source and working fluid in the main heat exchanger into account. This is mainly due to better temperature glide matching between heat source and working fluid. The CO2 cycle also shows no pinch limitation in the heat exchanger. This study treats the performance of the CO2 transcritical power cycle utilizing energy from low-grade waste heat to produce useful work in comparison to an ORC using R-123 as working fluid. Due to the temperature gradients for the heat source and heat sink the thermodynamic mean temperature has been used as a reference temperature when comparing both cycles. The thermodynamic models have been developed in EES2 The relative efficiencies have been calculated for both cycles. The results obtained show that when utilizing the low-grade waste heat with the same thermodynamic mean heat rejection temperature, a transcritical carbon dioxide power system gives a slightly higher power output than the organic rankine cycle. [Reprinted with permission from Elsevier. Copyright, 2006].

Détails

  • Titre original : A comparative study of the carbon dioxide transcritical power cycle compared with an organic Rankine cycle with R-123 as working fluid in waste heat recovery.
  • Identifiant de la fiche : 2007-0523
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 26 - n. 17-18
  • Date d'édition : 12/2006

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