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Experimental study on working stability in transcritical CO2 system with ejector.

Author(s) : CHEN G. M., XU X. X., TANG L. M., et al.

Summary

This article presents an experimental study on the working stability in a trans-critical CO2 system with ejector. Experiments were carried out to reveal the influences of operating conditions and throttle opening on the system working stability. Through analysis of the trends in primary flow pressure, entrained flow pressure, back pressure, primary flow rate, entrained flow rate, entrainment ratio, and pressure lift, the following characteristics of the system stability were obtained. Changes in cooling water flow rate or throttle opening can cause the system to transition from one stable state to another stable state. It can behave in an unstable way during the transition. When the throttle was nearly full open (90%), the primary pressure was close to the high-pressure limit, and the primary flow reached choke condition of the compressor. The system became unstable and must be shut down otherwise the system can not operate. When the throttle opening was nearly full closed (5%), the flow rate of the entrained fluid decreased until to zero. The ejector no longer entrains this fluid. The system became unstable and must be shut down otherwise the system also can not operate.

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Pages: 2010-2

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Details

  • Original title: Experimental study on working stability in transcritical CO2 system with ejector.
  • Record ID : 2010-1749
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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