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<p>A heat-driven ejector can substitute the compressor in the traditional vapour compression refrigeration cycle. This study explores the utilization of waste heat from flue gas at 150&#xa0;°C using an ejector refrigeration cycle (ERC) operating with one of three dry working fluids: R245ca, R245fa, and R600. Thermodynamic performance is assessed based on the refrigeration effect per kilogram of flue gas flow and second law efficiency. Additionally, the annual avoidable CO<sub>2</sub> emissions (ACE) and payback period (PBP) are evaluated to examine the environmental and economic viability.The ERC demonstrates comparable thermo-economic performance across all three working fluids. For each kilogram of flue gas flow, the cooling effects achieved are 12.45&#xa0;kW (R245ca), 12.93&#xa0;kW (R245fa), and 13.07&#xa0;kW (R600), with corresponding second law efficiencies of 5.50%, 5.62%, and 5.44%, respectively. At a flue gas flow rate of 10&#xa0;kg/s, the estimated payback periods for the systems are 6.5&#xa0;years (R245ca), 6.7&#xa0;years (R245fa), and 7.6&#xa0;years (R600). Moreover, the system is capable of reducing annual CO₂ emissions by 112.9 to 119.8 tons through waste heat recovery using these working fluids.</p>

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Waste Heat Recovery Through Ejector Refrigeration Cycles Using Dry Working Fluids

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Subha Mondal,
  • Shahnawaz Alam,
  • Sudipta De

摘要

A heat-driven ejector can substitute the compressor in the traditional vapour compression refrigeration cycle. This study explores the utilization of waste heat from flue gas at 150 °C using an ejector refrigeration cycle (ERC) operating with one of three dry working fluids: R245ca, R245fa, and R600. Thermodynamic performance is assessed based on the refrigeration effect per kilogram of flue gas flow and second law efficiency. Additionally, the annual avoidable CO2 emissions (ACE) and payback period (PBP) are evaluated to examine the environmental and economic viability.The ERC demonstrates comparable thermo-economic performance across all three working fluids. For each kilogram of flue gas flow, the cooling effects achieved are 12.45 kW (R245ca), 12.93 kW (R245fa), and 13.07 kW (R600), with corresponding second law efficiencies of 5.50%, 5.62%, and 5.44%, respectively. At a flue gas flow rate of 10 kg/s, the estimated payback periods for the systems are 6.5 years (R245ca), 6.7 years (R245fa), and 7.6 years (R600). Moreover, the system is capable of reducing annual CO₂ emissions by 112.9 to 119.8 tons through waste heat recovery using these working fluids.