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Experimental validation and design study of a transcritical CO2 prototype ejector system.

Author(s) : ELBEL S., HRNJAK P.

Summary

This paper presents experimental results obtained from a transcritical CO2 system using a refrigerant ejector instead of an expansion valve. The cooling capacity and COP simultaneously improved by up to 8 and 7%, respectively. Experiments were analyzed to quantitatively assess the effects on system performance as a result of changes in basic ejector dimensions such as motive nozzle and diffuser sizing. Small diffuser angles (5°) yielded best results. It was numerically predicted and experimentally verified that like in a conventional transcritical CO2 system, the high-side pressure control integrated into the ejector can be used to maximize the system performance. Due to difficulties in the ejector throat pressure measurements a more practical performance metric was introduced in order to quantify overall ejector efficiencies. According to this definition, the prototype ejector was able to recover up to 35% of the throttling losses.

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Pages: 2006-2

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Details

  • Original title: Experimental validation and design study of a transcritical CO2 prototype ejector system.
  • Record ID : 2007-1549
  • Languages: English
  • Source: 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
  • Publication date: 2006/05/29

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