Document IIF
Performance du transfert de chaleur et comportement de l'huile pour le R744 et l'huile PAG dans un échangeur de chaleur refroidi à l'air.
Heat transfer performance and oil behaviour for R744 with PAG oil in air-cooled heat exchanger.
Auteurs : YOSHIOKA S., KIM H. Y., KASAI K.
Résumé
Carbon dioxide (R744) has become a great issue in the application to refrigerators and air conditioning systems as a natural refrigerant. In the R744 heat pump system, PAG oil is commonly used for lubrication of the compressor, while it was reported that the PAG oil is influential on the heat transfer performance due to its immiscibility against R744. This paper deals with an experimental study on the heat transfer performance of fin and tube heat exchangers working with R744 as a refrigerant taking PAG oil effect into account. From experiments on two types of air-cooled heat exchangers with smooth tubes and grooved tubes at varying the PAG oil circulation rate (OCR), it was found that the heat transfer performance decreases significantly as OCR increases in both evaporator test and gas-cooler test, however the deterioration was different between smooth and grooved tubes. For the understanding of these phenomena, the oil retention rate in each heat exchanger was measured and it was found that the heat transfer characteristics can be correlated with the oil retention rate. In addition, flow inside tube was visualized to observe the oil behaviour in refrigerant flow at gas-cooler condition. It was confirmed that a large amount of oil flows as liquid film along the tube wall and certain portion of droplets moves mixed with the main refrigerant flow.
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Détails
- Titre original : Heat transfer performance and oil behaviour for R744 with PAG oil in air-cooled heat exchanger.
- Identifiant de la fiche : 2009-0071
- Langues : Anglais
- Source : 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
- Date d'édition : 07/09/2008
Liens
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Indexation
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Effect of PAG oil circulation rate on the heat ...
- Auteurs : YOSHIOKA S., KIM H., KASAI K.
- Date : 20/05/2008
- Langues : Anglais
- Source : 9th IEA Heat Pump Conference 2008: advances and prospects in technology, applications and markets. Conference proceedings [CD-ROM + abstracts].
Voir la fiche
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The effect of inner grooved tubes on the heat t...
- Auteurs : KAJI R., YOSHIOKA S., FUJINO H.
- Date : 16/07/2012
- Langues : Anglais
- Source : 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
Voir la fiche
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Discussions on prediction methods of evaporatio...
- Auteurs : GAO L., SATO M., MATSUSAKA Y., et al.
- Date : 20/05/2009
- Langues : Anglais
- Source : ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
- Formats : PDF
Voir la fiche
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Effect of PAG-type lubricating oil on heat tran...
- Auteurs : DANG C., IINO K., HIHARA E.
- Date : 05/2010
- Langues : Anglais
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 33 - n. 3
- Formats : PDF
Voir la fiche
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Flow patterns and heat transfer characteristics...
- Auteurs : GAO L., ONO T., HONDA T.
- Date : 07/09/2008
- Langues : Anglais
- Source : 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
- Formats : PDF
Voir la fiche