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Flow boiling of R723 (ammonia/dimethylether) in smooth horizontal tubes in the presence of oil.

Author(s) : BOYMAN T., KUHN C.

Summary

Direct evaporation of the refrigerant inside tubes (flow boiling) allows for a significant minimization of the plant refrigerant charge. However, very small quantities of lubricant can have an important impact on the flow boiling, thus causing a decrease of the flow boiling heat transfer coefficient, depending on the miscibility of oil with the refrigerant. In a previous paper the authors presented experimental data for the evaporation of the natural refrigerant ammonia (R717) inside smooth horizontal tubes: experiments run with a frequently-used fully-synthetic oil (PAO with ISO-VG 68), which is immiscible with ammonia, with oil contents from 0.1 to 3% showed a very important decrease of the flow boiling heat transfer coefficient of ammonia.

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Details

  • Original title: Flow boiling of R723 (ammonia/dimethylether) in smooth horizontal tubes in the presence of oil.
  • Record ID : 2007-1455
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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