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High-speed low power radial turbo compressor for oil-free heat pumps.

Author(s) : SCHIFFMANN J., FAVRAT D.

Summary

The presence of oil in domestic heat pumps is a hindrance, particularly for enhanced surface evaporators and for advanced concepts based on two-stage cycles. Very compact oil-free dynamic compressors directly driven by high speed electric motors and supported on refrigerant vapour bearings represent a promising alternative. This paper presents a design analysis of the first stage prototype with the various tradeoffs between the impeller characteristics to follow the seasonable heat demand, the bearing and rotor stability and the constraints linked with the high speed electric motor. Refrigerant chosen for the first experimental approach is HFC-134a with a 20 mm diameter impeller, a 6 kW motor and self-acting bearings. The impeller design and predicted performance as well as the experimental facility for the initial tests are presented.

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Details

  • Original title: High-speed low power radial turbo compressor for oil-free heat pumps.
  • Record ID : 2007-2305
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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