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<p>As a highly effective means of heat recovery from industrial waste gas, the organic Rankine cycle (ORC) demonstrates substantial potential for enhancing energy sustainability. However, the impact of water vapor in waste gas is often overlooked in existing studies. To address this gap, an ORC system utilizing moist waste gas as the heat source is developed, employing R245fa, R113, and R134a as working fluids. The thermodynamic performance of the ORC system is systematically examined, focusing on the impacts of waste gas initial and final temperatures as well as evaporation temperature under varying moisture content scenarios. The results show that latent heat is released from moist waste gas with a humidity greater than 0.08&#xa0;kg/kg when the final temperature reaches 50 ℃. Under constant humidity conditions, the net power output rises with a reduction in the waste gas’s final temperature, a trend that is characterized by an inflection point. Both net power output and exergy efficiency improve with higher evaporation temperatures. Of all the working fluids investigated, R113 demonstrated the greatest net power output and exergy efficiency, followed by R245fa and R134a. For moist waste gas, when the final temperature is below 59.36 ℃, exergy efficiency decreases as the initial temperature rises, while the trend reverses beyond this temperature range. Furthermore, the exergy efficiency of moist waste gas remains stable within this specific temperature range.</p>

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Thermodynamic investigation of an organic Rankine cycle (ORC) system for waste heat recovery from moist waste gas

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Xuan Zhao,
  • Wenqiang Sun

摘要

As a highly effective means of heat recovery from industrial waste gas, the organic Rankine cycle (ORC) demonstrates substantial potential for enhancing energy sustainability. However, the impact of water vapor in waste gas is often overlooked in existing studies. To address this gap, an ORC system utilizing moist waste gas as the heat source is developed, employing R245fa, R113, and R134a as working fluids. The thermodynamic performance of the ORC system is systematically examined, focusing on the impacts of waste gas initial and final temperatures as well as evaporation temperature under varying moisture content scenarios. The results show that latent heat is released from moist waste gas with a humidity greater than 0.08 kg/kg when the final temperature reaches 50 ℃. Under constant humidity conditions, the net power output rises with a reduction in the waste gas’s final temperature, a trend that is characterized by an inflection point. Both net power output and exergy efficiency improve with higher evaporation temperatures. Of all the working fluids investigated, R113 demonstrated the greatest net power output and exergy efficiency, followed by R245fa and R134a. For moist waste gas, when the final temperature is below 59.36 ℃, exergy efficiency decreases as the initial temperature rises, while the trend reverses beyond this temperature range. Furthermore, the exergy efficiency of moist waste gas remains stable within this specific temperature range.