Partager

Étude sur le démarrage et la fiabilité lors du fonctionnement transitoire d’une pompe à chaleur aérothermique à basse température.

Investigation on start-up and reliability during unsteady process of low temperature air source heat pump.

Numéro : pap. 2395

Auteurs : LIANG Y., SHEN J., ZHAO H., et al.

Résumé

In this paper the air source heat pump variable refrigerant flow (VRF) of two-stage vapor injection system were analyzed, to investigate the compressor start-up performance at low ambient temperature and the system reliability during unsteady operating process. The start-up control logic of VRF were designed, which combined the control of the electronic expansion valves (EXV), the oil switch valve (SV) and the elevator rate of compressor frequency, to achieve the unit steadily started up at -35?. In the study on the reliability during unsteady process of the system, the phenomena of the refluence vapor and the enthalpy increasing by vapor injection flowing with liquid, and the trend of the system parameter at their critical state were researched. Besides, the relation of the compression ratio at low stage and the volume ratio of high stage to low stage was gained at refluence state, and it was validated with the experiment in the unit. The experimental results of the VRF showed that the critical compression ratio of low stage at refluence state was close to the reciprocal of the volume ratio, and the refluence didn’t happen when the volume ratio was 1.0.

Documents disponibles

Format PDF

Pages : 10

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 : Investigation on start-up and reliability during unsteady process of low temperature air source heat pump.
  • Identifiant de la fiche : 30024534
  • Langues : Anglais
  • Source : 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 09/07/2018

Liens


Voir d'autres communications du même compte rendu (252)
Voir le compte rendu de la conférence

Indexation