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Étude tridimensionnelle par la mécanique numérique des fluides et optimisation d’un turbocompresseur centrifuge pour un fonctionnement dans le cycle d'une pompe à chaleur hybride à sorption/compression.

3D-CFD design study and optimization of a centrifugal turbo compressor for the operation in a hybrid sorption/compression heat pump cycle.

Numéro : pap.1226

Auteurs : ECKERT T., DOSTAL L., HELM M., et al.

Résumé

In various applications the use of sorption chillers and heat pumps is limited by the available temperature level of the driving heat source or the heat sink for export of reject heat. These constraints can be overcome by integrating an efficient high-speed transonic turbo-compressor into the internal cycle of a thermally driven water/lithium bromide absorption heat pump. The operation in a hybrid heat pump with the refrigerant water implies specific challenges for the design of the compressor: Saturation pressures in the sub-atmospheric range, low vapor density, high volume flows and a targeted pressure ratio of 3 result in high impeller tip speed up to 660 m/s and transonic flow phenomena in the flow channel of impeller and diffusor. Here the authors present a theoretical design study based on a 3D-simulation of a centrifugal compressor, targeted at the given operating conditions for a hybrid heat pump. Key figures are investigated to figure out the relationship between impeller tip speed, compressor pressure ratio and operating range of the compressor meeting the requirements, wide stable operating range between surge and choke line and appropriate pressure ratio. The optimization of the impeller geometry comprises both fluid dynamic behavior and structural stability.

Documents disponibles

Format PDF

Pages : 10 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : 3D-CFD design study and optimization of a centrifugal turbo compressor for the operation in a hybrid sorption/compression heat pump cycle.
  • Identifiant de la fiche : 30019525
  • Langues : Anglais
  • Source : 2016 Purdue Conferences. 23rd International Compressor Engineering Conference at Purdue.
  • Date d'édition : 11/07/2016

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