Parametric exergy analysis of a two-stage vapour compression cycle for freeze desalination comparing eco-friendly refrigerants
by Shrikant Jadhav; S. Pavitran; Suresh Gosavi
International Journal of Exergy (IJEX), Vol. 39, No. 1, 2022

Abstract: The current work aims to analyse a two-stage vapour compression refrigeration (TSVCR) cycle for freeze desalination. In this system, a low-pressure reversible subsystem (LPS) performs simultaneous freezing-thawing. The high-pressure subsystem (HPS) ensures cycle thermal stability. A mathematical model is developed to evaluate energy and exergy performance. Three eco-friendly refrigerants [R1234ze(E), R1234yf and R1243zf] are considered and compared with R22. The results show COP ranging from 6.5 to 12.7, with a specific energy consumption of 8.2 to 14.8 kWh/m³ of freshwater. The highest exergy efficiency of 38.4% is reported for R1243zf, which is higher by 1-3%, compared to R22 and R1234ze(E). However, R1234yf exhibits 11.14% and 7.8% lower energy and exergy performance. The maximum exergy destruction arises from the low pressure compressor (29%) followed by the latent heat condenser (23%). The uncondensed refrigerant significantly affects the performance and thermal stability. The study shows R1243zf and R1234ze are good alternatives to R22 due to their better energy and exergy performance.

Online publication date: Mon, 08-Aug-2022

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