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Modélisation dynamique d’un climatiseur monobloc avec condenseur à échangeur de chaleur à microcanaux.

Dynamic modeling of packaged air conditioner with microchannel heat exchanger condenser.

Numéro : 2267

Auteurs : ALGHAMDI K. I., BACH C. K.

Résumé

Microchannel Heat Exchangers (MCHX) are used in Air Conditioning systems (AC) as an efficient type of Heat Exchangers (HX) because they have compact size, as well as low refrigerant charge. However, using MCHX as condensers can be associated with some problems, including evaporator-condenser transient charge balance issues. Therefore, this study aims to investigate the impact of using MCHX as a condenser in a packaged air conditioner with a finandtube heat exchanger as an evaporator. The methodology was dynamically modeling the packaged air conditioner in Modelica, considering varying pass configurations of MCHX with several refrigerant charges. The results showed that the pressure in the highpressure side of the refrigerant cycle increases as the number of tubes in the inletpass of the MCHX decreases. In addition, if the difference in the number of tubes among the inletpass and the outletpass is large, the pressure increases regardless of which pass has the highest number of tubes. Moreover, the pressure can increase after a while at the beginning of an oncycle due to the slow response of Thermostatic Expansion Valve (TXV) caused by the thermal inertia of the sensing bulb. We defined a mass ratio as mass of refrigerant in the evaporator to the mass in the condenser. A decrease in the mass ratio for a given total charge corresponds to the refrigerant accumulating in the condenser, increasing pressure in the condenser.

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 : Dynamic modeling of packaged air conditioner with microchannel heat exchanger condenser.
  • Identifiant de la fiche : 30028451
  • 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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