Thermodynamic analyses on an ejector enhanced CO2 transcritical heat pump cycle with vapor-injection

Release Time:2025-04-30  Hits:

• Date:2025-04-30
• Title of Paper:Thermodynamic analyses on an ejector enhanced CO2 transcritical heat pump cycle with vapor-injection
• Journal:International Journal of Refrigeration
• Summary:In this paper, an ejector enhanced vapor injection CO2 transcritical heat pump cycle with
  sub-cooler (ESCVI) for heating application in cold regions is proposed. The thermodynamic
  analysis using energetic and exegetic methods is carried out to predict the performance
  characteristics of the ejector enhanced cycle, and then compared with those of the conventional
  vapor injection heat pump cycle with sub-cooler (SCVI). The simulation results
  demonstrate that the ejector enhanced cycle exhibits better performance than the conventional
  vapor injection cycle under the specified operating conditions. The improvements
  of the maximum system COP and volumetric heating capacity could reach up to
  7.7% and 9.5%, respectively. Exergetic analysis indicates that the largest exergy destruction
  ratio is generated at the compressor followed by the evaporator and gas cooler. Additionally,
  the exergy efficiency of the ejector is introduced to quantify the effectiveness of
  the exergy recovery process, which may be a new criterion to evaluate the performance of
  the ejector enhanced vapor compression cycle.
• Co-author:Tao Bai, Gang Yan*, Jianlin Yu
• Volume:58
• Page Number:22-34
• Translation or Not:No
• Date of Publication:2015-04-20