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Comparaison des impacts de défaillances multiples sur une pompe à chaleur et un climatiseur en mode refroidissement.

Comparison of multiple fault impacts on a heat pump and an air conditioner in cooling mode.

Numéro : 2278

Auteurs : HU Y., YUILL D. P.

Résumé

Operating faults that degrade performance of residential air-conditioning systems can be caused by problems during installation, and are believed to be quite common. When a problem occurs during installation, potentially from a lack of training or care by a technician, difficult work conditions, etc., it is likely that several faults can occur simultaneously. Many studies have investigated single-fault impacts on system performance during the past three decades. However, few of them studied simultaneous fault impacts, especially for more than two simultaneous faults. Therefore, the current study investigated four common installation fault impacts, both singly and in combination (up to 4 at a time), on the performance of a high-efficiency split heat pump system equipped with a thermostatic expansion valve and a standard-efficiency air conditioner equipped with a fixed orifice expansion device in cooling mode. These four faults are: improper evaporator airflow, improper refrigerant charge, liquid line restrictions, and the presence of non-condensable gas in the refrigerant. The fault intensities for each fault are varied, with limits selected based on practical considerations, and are imposed similarly on each system. The results are compared according to fault type and fault intensity imposed. For single faults, the air conditioner performs better than the heat pump when refrigerant overcharge (OC) or low evaporator faults are present. When simultaneous faults are present, the heat pump performs better for almost all fault combinations except for combinations that include OC.

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Pages : 10 p.

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Détails

  • Titre original : Comparison of multiple fault impacts on a heat pump and an air conditioner in cooling mode.
  • Identifiant de la fiche : 30030642
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 2022

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