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Heat transfer in small piston compressors.

Author(s) : MÜLLNER T., BIELMEIER O.

Summary

This paper presents an investigation about heat transfer in small, fast running piston compressors. Focus of interest is the heat transfer from the compression chamber, into adjacent structures. In a second step, the influence of geometrical issues in terms of size, spatial distribution and shape of inlet and outlet ports has been studied. An "idealized" compressor system has been modelled with a commercially available CFD program. The kinetics of the crank gear as well as the dynamics of inlet and outlet valve was implemented in the model. Constant temperature at boundaries has been described to keep calculation time low. The first section of the paper describes the basic modelling of piston and valve motion and the dynamic discretization of the fluid volume. In the second section 4 different valves are presented with differing geometrical shape, size and arrangement of ports. Time dependent heat fluxes and heat transfer coefficients are calculated for all involved physical interfaces. It is shown how the variation of pure geometrical terms influences the "thermal behaviour" of the whole system. A short outlook of how these results could be used to optimize the valve system from the thermal point of view concludes the paper.

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Details

  • Original title: Heat transfer in small piston compressors.
  • Record ID : 2008-2457
  • 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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