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Consideration of sludge formation in HFC-134a/polyolester oil refrigeration system.

[In Japanese. / En japonais.]

Author(s) : YAMAMOTO T., YAMAMOTO Te., SIMIZU Y., NAKAYAMA Y., TAKIZAWA K.

Type of article: Article

Summary

A refrigeration test employing HFC134a and polyolester oil was carried out in order to make clear the causes of the sludge formation in the capillary tube. Two types of compressors were used: a hermetic reciprocating compressor and a rotary compressor. The installed dryer contained desiccant of the compound zeolite type. The results showed that the amount of capillary sludge increased as the compressor temperature rose. The capillary sludge was determined to consist of desiccant and metal dust for the reciprocating compressor, and of tar-like substance for the rotary compressor. The thermal stability test that was used to check the degree of deterioration of the ester oil, suggested that the presence of dessicant and high compressor temperature might produce tar-like substance through the breakdown and polymerization of the ester oil. In addition, it was confirmed that factors affecting the sludge formation were the dirtiness of the refrigeration circuit for the reciprocating compressor, and the presence of desiccant for the rotary compressor.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1997-1450
  • Languages: Japanese
  • Source: Trans. JAR - vol. 13 - n. 2
  • Publication date: 1996
  • Document available for consultation in the library of the IIR headquarters only.

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