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<p>Exergetic sustainability and environmental impact analyses of cascade refrigeration cycles were conducted using different refrigerant pairs, such as R744A/R600, R170/R600, R41/R600, and R1150/R600, and results thus obtained are compared with the results of previous studies reported in this filed. The refrigerant pair R744A/R600 emits 797&#xa0;kg carbon to the environment during its whole life span, which is the lowest one in comparison with other pairs such as R1150/R600, R170/R600, R41/R600, R744A/R290, R1150/R290, R170/R290, R41/ R290, R744A/R1270, R1150/R1270, R170/R1270, R41/R1270. A lower exergy destruction rate and lower compressor work requirements make the R744A/R600 refrigerant pair a more economical refrigerant pair, among others. R744A/R600 provides the lowest exergy destruction rate, which is approximately 17.48%, 15.27%, and 27.5% lower than those of R170/R600, R1150/R600, and R41/R600 pairs, respectively. Refrigerant pair R170/R600 is slightly more exegetically sustainable than R744A/R600, followed by refrigerant pairs R41/R600 and R1150/R600. Cascade cycle operating with R744A/R600 had the lowest environmental carbon emissions, approximately 18%, 28%, and 14% lower than those of R170/R600, R41/R600, and R1150/R600, respectively. Furthermore, the operational and environmental costs of R744A/R600 are 14–28% lower than those of the other selected refrigerant pairs. The maximum energy efficiency ratio achieved for the cycle is 2.65 when the system operates with refrigerant pair R170/R600, followed by 2.62 and 2.6 for R41/R600 and R744A/R600, respectively, and the lowest is 2.5 for the system operating with refrigerant pair R1150/R600. The exergetic sustainability indices for R744A/R600, R170/R600, R1150/R600, and R41/R600 have been obtained as 1.65, 1.675, 1.66, and 1.61, respectively. The refrigerant pair R744A/R600 has 2.4% higher EII values than R170/R600 and still has more environmental safety due to its lowest carbon emission rate. Furthermore, the higher values of the adaptability factor and the high volumetric cooling capacity of R744A/R600 refrigerant pair compared to the other refrigerant pairs studied in the present work make this refrigerant more suitable.</p>

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Exergetic sustainability and environmental impact index analysis to reduce carbon footprints of ultra-low temperature cascade refrigeration

  • 期刊论文

  • 发表日期：

    2025年2月23日

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  • Sachin Kumar,
  • Pardeep Gahlot,
  • Suresh Kumar

摘要

Exergetic sustainability and environmental impact analyses of cascade refrigeration cycles were conducted using different refrigerant pairs, such as R744A/R600, R170/R600, R41/R600, and R1150/R600, and results thus obtained are compared with the results of previous studies reported in this filed. The refrigerant pair R744A/R600 emits 797 kg carbon to the environment during its whole life span, which is the lowest one in comparison with other pairs such as R1150/R600, R170/R600, R41/R600, R744A/R290, R1150/R290, R170/R290, R41/ R290, R744A/R1270, R1150/R1270, R170/R1270, R41/R1270. A lower exergy destruction rate and lower compressor work requirements make the R744A/R600 refrigerant pair a more economical refrigerant pair, among others. R744A/R600 provides the lowest exergy destruction rate, which is approximately 17.48%, 15.27%, and 27.5% lower than those of R170/R600, R1150/R600, and R41/R600 pairs, respectively. Refrigerant pair R170/R600 is slightly more exegetically sustainable than R744A/R600, followed by refrigerant pairs R41/R600 and R1150/R600. Cascade cycle operating with R744A/R600 had the lowest environmental carbon emissions, approximately 18%, 28%, and 14% lower than those of R170/R600, R41/R600, and R1150/R600, respectively. Furthermore, the operational and environmental costs of R744A/R600 are 14–28% lower than those of the other selected refrigerant pairs. The maximum energy efficiency ratio achieved for the cycle is 2.65 when the system operates with refrigerant pair R170/R600, followed by 2.62 and 2.6 for R41/R600 and R744A/R600, respectively, and the lowest is 2.5 for the system operating with refrigerant pair R1150/R600. The exergetic sustainability indices for R744A/R600, R170/R600, R1150/R600, and R41/R600 have been obtained as 1.65, 1.675, 1.66, and 1.61, respectively. The refrigerant pair R744A/R600 has 2.4% higher EII values than R170/R600 and still has more environmental safety due to its lowest carbon emission rate. Furthermore, the higher values of the adaptability factor and the high volumetric cooling capacity of R744A/R600 refrigerant pair compared to the other refrigerant pairs studied in the present work make this refrigerant more suitable.