Share

Part load efficiency benefit of oil-free centrifugal compressors.

Author(s) : ALVARES J.

Type of article: Article

Summary

This article will present a seasonal energy efficiency analysis of a water-cooled chiller with multiple oil-free, high-speed 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.

Available documents

Format PDF

Pages: 58-64 (4 p.)

Available

  • Public price

    20 €

  • Member price*

    15 €

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Part load efficiency benefit of oil-free centrifugal compressors.
  • Record ID : 30014521
  • Languages: English
  • Source: Air Conditioning and Refrigeration Journal - vol. 18 - n. 1
  • Publication date: 2015/01

Links


See other articles in this issue (2)
See the source

Indexing