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Document IIF

Impact du démarrage des ventilateurs sur la performance d'une pompe à chaleur air/eau en application dégivrage à cycle inversé.

Effects of fan-starting methods on the reverse-cycle defrost performance of an air-to-water heat pump.

Auteurs : HUANG D., YUAN X., ZHANG X.

Type d'article : Article, Article de la RIF

Résumé

The effects of fan starting methods on the defrost performance in an air-source heat pump were investigated experimentally. Experiments were conducted on a 50 kW unitary air-to-water heat pump. The dynamic characteristics of both the coil fan pre-start and normal-start tests during the defrost cycle were discussed. The peak of discharge pressure for the fan normal-start test was up to 2595.6 kPa during defrost termination and recovery time, which was close to the discharge protection value (2650 kPa). The discharge pressure for the fan pre-start test was 742.3 kPa lower at the end of the drain time, so the peak of the discharge pressure was 687 kPa lower during the defrost termination and recovery time than that for the fan normal-start test. The authors found that the phenomenon seemed to be related to both the small inner volume of the plate heat exchanger and larger refrigerant flow rate during the defrost termination and recovery time. Pertinent performance data (pressure, temperature, superheat, sub-cooling, etc) was plotted and discussed to determine the effects of the coil fan pre-start.

Documents disponibles

Format PDF

Pages : 869-875

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 : Effects of fan-starting methods on the reverse-cycle defrost performance of an air-to-water heat pump.
  • Identifiant de la fiche : 2005-0923
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 8
  • Date d'édition : 12/2004

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