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Experimental results and evaluation of 2-stage compression and expansion cycle using CO2.

Author(s) : IMAI S., ITSUKI H., OTAKE M., et al.

Summary

The authors considered a two-stage compression, two-stage expansion cycle as a way of improving cycle efficiency when using CO2 refrigerant. The two-stage compression expansion cycle has a gas-liquid separator installed at the intermediate pressure point in the middle of the pressure-reducing circuit of a common refrigeration cycle using a two-stage compressor. The refrigerant is separated into gas and liquid, with the gas returning to the compressor's second stage inlet, and the liquid being further reduced in pressure and fed to the evaporator. Presuming that an identical cycle was used at low temperatures, the two-stage expansion cycle is effective because the CO2 refrigerant is drier at the entrance of the evaporator than an HFC refrigerant. The main paper reports the characteristics investigated by the authors using a test version of the two-stage compression two-stage expansion cycle that they built.

Details

  • Original title: Experimental results and evaluation of 2-stage compression and expansion cycle using CO2.
  • Record ID : 2006-2870
  • Languages: English
  • Source: 8th IEA Heat Pump Conference 2005: global advances in heat pump technology, applications, and markets. Conference proceedings [CD-ROM].
  • Publication date: 2005/05/02

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