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Small, high-speed, oil-free radial turbo-compressors for cooling applications: refrigerant selection.

Number: pap. 2386

Author(s) : KONTOMARIS K. K., ARPAGAUS C., BERTSCH S. S., et al.

Summary

Emerging energy-efficient, oil-free radial centrifugal compressors seem promising for small to mid-capacity air conditioning and refrigeration applications. Compressor design must balance trade-offs among impeller diameter, bearing type, and refrigerant selection. This paper guides refrigerant selection for single-stage systems delivering 10-250 kWtherm of cooling at a representative evaporating temperature of 0 oC. The viable oil-free bearing types, the impeller diameter for maximum compressor efficiency and the resulting system efficiency were determined for a set of representative refrigerants with normal boiling temperatures ranging from -51.7 oC to +49 oC. For residential scale cooling systems, low pressure refrigerants enable high energy efficiency with small size, high-speed centrifugal compressors and vapor-lubricated bearings. For commercial scale cooling systems, medium pressure refrigerants enable high energy efficiency with reasonable size, high-speed centrifugal compressors and vapor-lubricated bearings. For commercial scale cooling systems, low pressure refrigerants enable higher energy efficiency with larger size, high-speed centrifugal compressors and magnetic bearings compared to medium pressure refrigerants with vapor-lubricated bearings. The preferred refrigerant enables combinations of system first and operating costs that are attractive for the intended markets, while meeting equipment reliability, operability and other constraints.

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Pages: 10

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Details

  • Original title: Small, high-speed, oil-free radial turbo-compressors for cooling applications: refrigerant selection.
  • Record ID : 30024528
  • Languages: English
  • Subject: General information
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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