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Analysis of two-stage compression in a scroll compressor.

Author(s) : BUKAC H.

Summary

The model of two-stage compression processes, and plots of results of modelling in temperature-entropy, pressure enthalpy and pressure-volume diagrams show advantages and disadvantages of high and low built-in compression ratios as well as the effect of large and small volume of the dome. Also of interest is the velocity of refrigerant gas during the pressure and temperature equalization. The velocity of flow during pressure and temperature equalization starts with local velocity of sound, and it decreases rapidly to zero. The short burst of gas flow with sonic velocity that is accompanied by a sudden change in pressure in the dome and in the last pocket are sources of typical noise that is inherent to all scroll compressors. Experiments have shown the scroll compressor runs most quiet when the pressure in the dome, which is approximately equal to the condensing pressure, is equal to the pressure in the last innermost pocket when the this pocket opens and co-joins with the volume of the dome.

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Details

  • Original title: Analysis of two-stage compression in a scroll compressor.
  • Record ID : 2008-2485
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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