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Simulations de performance d'une pompe à chaleur à vis biétagée avec économiseur.

Performance simulations of two-stage screw heat pump with economizer.

Auteurs : BAIK Y. J., LEE Y. S., RA H. S., et al.

Résumé

In order to predict and optimize the performance of R-134a screw heat pump in various configurations and operating conditions, steady-state simulations were carried out in the study. The simulation model contains a high-stage compressor, a non-economized low-stage compressor, an economized low-stage compressor, expansion valves and heat exchangers. A high-stage compression was considered as a polytrophic process, while a condenser, an evaporator, an intermediate heat exchanger and an economizer were modelled by UA-LMTD method with a counter-flow assumption. An economized compressor was considered as it could be divided into 3 processes: the first-stage polytrophic internal compression process, the additional charge process with adiabatic and constant-volume assumption, and the second-stage polytrophic one. The simulation results show that the performance enhancement by two-staging becomes stronger as a heat sink outlet temperature goes higher.

Détails

  • Titre original : Performance simulations of two-stage screw heat pump with economizer.
  • Identifiant de la fiche : 2007-0857
  • Langues : Anglais
  • Source : ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Date d'édition : 21/05/2006

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