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Impacts et détection de gaz incondensable dans une pompe à chaleur aérothermique résidentielle.

Impacts and detection of non-condensable gas in a residential air source heat pump.

Numéro : 210040

Auteurs : HU Y., YUILL D. P., CHEN Y.

Résumé

Non-condensable gas (NC) introduced into a vapor compression air-conditioner or heat pump system by improper system evacuation during an installation or repair has negative impacts on the performance of the system. The NC’s partial pressure combines with the refrigerant pressure, increasing the condenser’s total pressure, hence increasing the compressor specific work, leading to reduced efficiency for the system. Although the impacts of NC can be significant and the fault is believed to be common, little research has been conducted on this fault, compared with other faults. This paper describes a study of NC faults that includes two experimental investigations. The first considers the impacts on performance at four operating conditions when NC faults are introduced to a fault-free system. The study also tests the impacts of NC when added to combinations of other types of faults. Laboratory test results from a 4-ton residential heat pump system are provided. This system was tested with NC at two intensity levels, in combination with: undercharge, overcharge, improper evaporator airflow, and liquid line restrictions. Combinations of two, three, and four simultaneous faults were tested. A second experimental investigation tests the accuracy of a field diagnostic method for NC faults, and a new diagnostic model is provided to quantify NC fault intensity in the field.

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 : Impacts and detection of non-condensable gas in a residential air source heat pump.
  • Identifiant de la fiche : 30028610
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 05/2021
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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