In this study, the performance characteristics of a gas-injection refrigeration system using ternary zeotropic mixtures of R32/R744/R1234yf were investigated to replace R404A. The performance of the gas-injection refrigeration system using R32/R744/R1234yf was measured and analyzed at various composition ratios. The test condition was set based on the refrigeration capacity B condition by the AHRI Standard 1251 (Indoor − 23 °C, outdoor 15 °C). The variation in the mass fraction of R32 affected the changes in latent heat and temperature glide. In addition, the injection pressure increased with an increase in the mass fraction of R744 owing to the low normal boiling point of R744. Based on the test results, the optimal composition ratio of R32/R744/R1234yf was determined to be 52/1/47 wt% considering the coefficient of performance (COP), refrigeration capacity, and global warming potential. R32/R744/R1234yf (52/1/47 wt%) showed a 9.56 % increase in COP and a 9.8 % decrease in life cycle climate performance (LCCP) compared with those of R448A owing to the lower compressor work and indirect emissions. The performance of the gas-injection refrigeration system using the mixture could be further improved by optimizing the system configuration.
|Applied Thermal Engineering
|Published - 2023 Jan 5
Bibliographical noteFunding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2020R1A5A1018153).
© 2022 Elsevier Ltd
- Alternative refrigerant
- Gas-injection refrigeration system
- Life cycle climate performance (LCCP)
- Optimal composition ratio
- Ternary refrigerant mixture
ASJC Scopus subject areas
- Mechanical Engineering
- Energy Engineering and Power Technology
- Fluid Flow and Transfer Processes
- Industrial and Manufacturing Engineering