Modélisation des compresseurs et détendeurs sous des conditions d'entrée diphasique de frigorigène.
Modelling of compressors and expansion devices with two-phase refrigerant inlet conditions.
Auteurs : SHEN B., BRAUN J. E., GROLL E. A.
Résumé
Simulation models for unitary air conditioners and heat pumps usually cannot provide accurate predictions in the case of two-phase refrigerant entering the compressor or fixed-area expansion device. This paper focuses on improving modelling methods in these situations. The study utilized extensive laboratory tests and detailed modelling of two unitary air conditioners, one using R-410A and the other R-407C. Heat exchanger models were used to give upstream qualities of the compressor and fixed orifice. It was found that it is best to use a two-phase suction density correction for compressor maps to predict the mass flow rate. However, using a two-phase suction density correction with a compressor map to predict the power consumption leads to significant under-predictions. It is best not to correct the compressor map power consumption for a two-phase entering condition. For the case of two-phase refrigerant entering a fixed-area expansion device, mass flow rate predictions from short-tube orifice models are extremely sensitive to the upstream quality. A two-point charge tuning method is recommended, as it can lead to an accurate prediction of upstream state for the expansion device at all refrigerant charge levels.
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Détails
- Titre original : Modelling of compressors and expansion devices with two-phase refrigerant inlet conditions.
- Identifiant de la fiche : 2008-2066
- Langues : Anglais
- Source : 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
- Date d'édition : 17/07/2006
Liens
Voir d'autres communications du même compte rendu (157)
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Indexation
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Thèmes :
Techniques des pompes à chaleur;
Autres équipements de conditionnement d'air;
Compresseurs;
Systèmes de détente;
Ecoulement diphasique;
Circulation du fluide : tuyauterie, régulation, automatisme, sécurité;
Mélanges - Mots-clés : Aspiration; R410A; R407C; Simulation; Pompe à chaleur; Modélisation; Mélange diphasique; Détendeur; Frigorigène; Conditionnement d'air; Compresseur
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- Date : 12/2007
- Langues : Anglais
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- Source : International Journal of thermal Sciences - vol. 48 - n. 6
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TWO-PHASE SEPARATED FLOW IN THE CAPILLARY TUBE.
- Auteurs : KROLICKI Z.
- Date : 24/08/1987
- Langues : Anglais
- Source : Development in refrigeration, refrigeration for development. Proceedings of the XVIIth international Congress of Refrigeration.
- Formats : PDF
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- Date : 14/07/2014
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- Source : 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
- Formats : PDF
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