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Energy and exergy analyses of an ejector-expansion recirculation cycle with zeotropic mixture R744/R1234yf for application in heat pumps.

Number: 0014

Author(s) : LU Y., BAI T., YU J.

Summary

At present, there are two main circulation modes for the expansion cycle of the ejector, one is standard ejector-expansion cycle (SEC), and the other is ejector-expansion recirculation cycle (ERC). In this study, the zeotropic mixture R744/R1234yf are used as the working fluid. And the performance of the ERC in heat pump application is evaluated by utilizing energetic and exergetic analysis methods. The effects of evaporator outlet temperature (Te), condenser outlet temperature (Tc) and CO2 mass fraction (ZCO2) on the cycle performance are investigated, and the results demonstrate that ERC exhibits better cycle performance than SEC. The maximum COP and volumetric heating capacity ( qcv ) of ERC improve by 24.6% and 37.7% at most compared to those of SEC, respectively. Compared to SEC, the exergy destruction of ERC is reduced by 29.8% on average. Furthermore, under given mass fraction range, the volumetric heating capacity increase with increasing of R1234yf fraction. The simulation results show that the ejector-expansion recirculation cycle has more obvious advantages when using mixed refrigerant.

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Pages: 8 p.

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Details

  • Original title: Energy and exergy analyses of an ejector-expansion recirculation cycle with zeotropic mixture R744/R1234yf for application in heat pumps.
  • Record ID : 30031024
  • 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.HFO2023.0014

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