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Effects of synthetic oil in a compression refrigeration system using R410A. Part II: quality of heat transfer and pressure losses within the heat exchangers.

Author(s) : LOTTIN O., GUILLEMET P., LEBRETON J. M.

Type of article: Article, IJR article

Summary

The consequences of the presence of oil rejected by the compressor of a vapour-compression refrigeration system on the operation of the evaporator and condenser are analysed. The modelled prototype uses a mixture of HFC R410A and a synthetic polyolester (POE) oil. The rise in the amount of lubricant circulating in the system leads to a progressive change in the behaviour of the mixture of refrigerant and oil that, for the higher oil mass fraction, evolves like a zeotropic mixture. It was also seen that the presence of lubricant is generally associated with a fall in the performances of the heat exchangers, except in the evaporator, where an optimum is observed when the quantity of oil is equal to 0.1% of the total mass of the mixture. Some conclusions are drawn regarding the choice of correlations for the calculation of the refrigerant side heat transfer coefficient in a plate evaporator.

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Pages: 783-794

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Details

  • Original title: Effects of synthetic oil in a compression refrigeration system using R410A. Part II: quality of heat transfer and pressure losses within the heat exchangers.
  • Record ID : 2004-1676
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 7
  • Publication date: 2003/11

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