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An improved mass flow rate prediction method for rolling piston compressors.

Number: 1463

Author(s) : LEE C. Y., HWANG Y., SHAFFER S.

Summary

An improved mass flow rate prediction method for rolling piston-type compressors was proposed. The critical parameters affecting the mixture leakage across the clearance were identified by deriving the governing equation of refrigerant mixture leakage inside the compression chamber. By correlating with the experimental reference test point, the geometry of the compression chamber can be ignored, and the refrigerant loss was only related to the mixture leakage from the compression side to the suction side. The volumetric efficiency can be predicted using the experimental result of a reference test point with solubility and kinematic viscosity data. A compressor test facility was built to measure the compressor mass flow rate under a wide range of testing conditions. The mixture temperature of the reference test point was assigned. For one reference point prediction, there are 34% data within a 5% deviation and 66% data within a 10% deviation. The prediction accuracy improved to 57% within a 5% deviation and 84% within a 10% deviation for two points prediction. Then, based on the regression data of the discharge temperature, an oil-sump temperature equation as a function of condensing temperature was derived. The single-point prediction accuracy even outperforms the manufacturer's map to 81% within a 5% deviation and 100% within a 10% deviation.

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Details

  • Original title: An improved mass flow rate prediction method for rolling piston compressors.
  • Record ID : 30030368
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15
  • Document available for consultation in the library of the IIR headquarters only.

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