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Analysis on the reliability of R290 rotary compressor in the high ambient temperature.

Author(s) : WU J., SHI H., LI J.

Type of article: Article, IJR article

Summary

The R290 rotary compressor is suggested to use in split room air conditioners in hot climate areas for its higher efficiency, environmental-friendly, and lower discharge temperature. However the higher condensing temperature and pressure would result in reliability problems. In this paper the reliability of rotary compressor with R290&MO and R290&SO (mainly including the motor reliability; the oil sump viscosity, temperature and solubility; the oil film thickness of bearings) under the ambient temperature of 35 °C,46 °C,55 °C were studied experimentally and numerically. The results show that the motor temperature in R290 rotary compressor is lower than the allowable maximum temperature even under the condition of EXT/8 (condensing temperature = 70 °C). In addition, the oil sump viscosity of either syn- thetic oil (SO) or mineral oil (MO) decrease with the increase of ambient temperature (SO: from 4.7cp to 3.1cp; MO: from 2.2cp to 1.6cp), while under any condition, the solubility of SO (15%–16%) or MO (22%–25%) varies little. Besides, in the high ambient temperature (46 °Cand 55 °C), it is feasible to increase suction superheat to satisfy the proper viscosity when MO is used, while it is infeasible to SO. Influenced by oil viscosity and load, the oil film thickness of main bearing, sub bearing and eccentric bearing decrease with the increase of ambient temperature.

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Pages: 132-141

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Details

  • Original title: Analysis on the reliability of R290 rotary compressor in the high ambient temperature.
  • Record ID : 30027294
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 110
  • Publication date: 2020/02
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2019.10.012

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