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The part-load efficiency benefit of oil-free, high-speed, direct-drive centrifugal compressors.

Number: pap. n. C10, 1349

Author(s) : ALVARES J.

Summary

This paper will present a seasonal energy efficiency analysis of a water-cooled chiller with multiple oil-free, highspeed direct-drive centrifugal compressors and compare the results against the seasonal energy efficiency that can be expected from water-cooled chillers with screw and scroll compressors. It will be shown that the fixed built-in compression ratio of screw compressors limits the compressor efficiency at the lower-lift off-design conditions where chillers operate most of the time while the variable speed direct drive centrifugal compressor maintains its peak efficiency at off-design conditions. Following the Air-Conditioning, Heating and Refrigeration Institute (AHRI) Standard 550-590 for performance rating of water-chilling packages it will be shown that high-speed direct-drive centrifugal chillers have the capability to reduce the annual energy consumption of water-cooled chillers by more than 30% compared to typical chillers with screw compressors as a result of better compressor efficiency at off-design conditions.

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Pages: 8 p.

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Details

  • Original title: The part-load efficiency benefit of oil-free, high-speed, direct-drive centrifugal compressors.
  • Record ID : 30001344
  • Languages: English
  • Source: 2010 Purdue Conferences. 20th International Compressor Engineering Conference at Purdue.
  • Publication date: 2010/07/12

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