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Energy and emission analysis of CO2 supermarket refrigeration system.

Number: 0011

Author(s) : LIU S., LI J., DAI B.

Summary

In the context of global warming, as a large user of refrigerants, the use of natural working fluid CO2 as refrigerant is a great trend in the future development of supermarket, and the choice of system configuration is crucial to the improvement of energy consumption. In this study, three improved thermodynamic models of CO2 refrigeration system with internal heat exchanger, parallel compression and mechanical subcooling are developed. The operation characteristics of four system configurations including the basic two-stage throttling CO2 refrigeration system are optimized and analyzed. Based on the meteorological parameters of typical Chinese cities, the seasonal and annual performance of the system is evaluated, and the carbon emissions are also evaluated. The results show that the system with internal heat exchanger has the most significant performance improvement at the ambient temperature of 7.0-14.0 ℃ . When the ambient temperature is greater than 14.0 ℃ , the energy efficiency is improved more obviously when mechanical subcooling system is adopted. The annual performance factor in hot climate is low, using the improved CO2 refrigeration system can significantly enhance the system energy efficiency in hot areas. The system performance improvement ratio is the highest by adopting mechanical subcooling system, with the largest annual performance factor improvement ratio of 18.7%, and the carbon emissions can be reducted by 19.3% using mechanical subcooling system in Xiamen.

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Pages: 7 p.

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Details

  • Original title: Energy and emission analysis of CO2 supermarket refrigeration system.
  • Record ID : 30031021
  • Languages: English
  • Subject: Technology
  • Source: 3rd IIR conference on HFO Refrigerants and low GWP Blends. Shanghai, China.
  • Publication date: 2023/04/05
  • DOI: http://dx.doi.org/10.18462/iir.HFO2023.0011

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