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Concentration measurement of refrigerant/lubricant mixture by capacitive sensor.

Number: pap. 1246

Author(s) : GINIES P., EVEN Y., GUESNAY Q.

Summary

The solubility of refrigerants in the lubricant is a key factor for the life time of a compressor with the new Low Global Warming Potential (LGWP) refrigerants showing generally higher solubility in lubricants than current refrigerants. During compressor operation, it is important to compare the dilution changes in the oil sump due to refrigerant properties to ensure proper lubrication of the bearings, and sampling is a measurement method that is commonly used to do this. However, this method can be time consuming, disturbs system behaviour and requires additional security precautions when sampling flammable refrigerants. This paper presents a new measurement method based on the permittivity properties of fluids and their mixtures. The investigations consider the use of HFC, HC, HFO and their blends. In most of the cases presented, the method used delivers satisfying results, but care should be taken for some fluids that exhibit polar properties. Measurements of viscosity and dilution in the oil sump of a compressor using this new method are presented here. Using a linear mixing rule for relative permittivity, the experimental data showed a very good correlation with sampling and PTVS curves (Daniel plots) when running at stabilized conditions. This method does not disturb system behaviour and decreases the time needed for the experiment.

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Pages: 10

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Details

  • Original title: Concentration measurement of refrigerant/lubricant mixture by capacitive sensor.
  • Record ID : 30024262
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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