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<p>Advancements in high-temperature heat pump technology are pivotal for achieving global carbon neutrality goals, with the working fluid’s heat transfer and flow properties being crucial for efficient condenser design. Nevertheless, research on high-temperature condensation of organic fluids is sparse, necessitating the development of accurate correlations for heat transfer and flow characteristics. This study emphasizes experimental research on R245fa’s condensation heat transfer and pressure drop within a 40°C–110°C saturation temperature range inside a plain tube with a 9-mm internal diameter. Sensitivity analysis highlighted the differences in condensation characteristics between high and low temperatures, and influencing mechanisms are revealed. Then, the measured data are employed to assess the accuracy of previous correlations. Based on the importance factor analysis result, adjustments are made to Reynolds number and flow regime boundaries. Finally, the correlations incorporating high temperature condensation of R245fa are developed, yielding a decrease in deviation from 17.6% to 7.23% for heat transfer and from 15.1% to 7.51% for frictional pressure drop gradient. Utilizing the newly developed models, 877 data points across 14 working fluids are predicted, results in a decrease in deviation from 18.85% to 10.65% for heat transfer coefficient, indicating a significant improvement in both accuracy and generality of the developed correlations.</p>

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Experimental Investigation on High-Temperature Condensation Heat Transfer and Flow Characteristics of Organic Fluid Used in Heat Pump

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • Zhantao Wu,
  • Yangkai Xia,
  • Xianglong Luo,
  • Yingzong Liang,
  • Jianyong Chen,
  • Jiacheng He,
  • Zhi Yang,
  • Ying Chen

摘要

Advancements in high-temperature heat pump technology are pivotal for achieving global carbon neutrality goals, with the working fluid’s heat transfer and flow properties being crucial for efficient condenser design. Nevertheless, research on high-temperature condensation of organic fluids is sparse, necessitating the development of accurate correlations for heat transfer and flow characteristics. This study emphasizes experimental research on R245fa’s condensation heat transfer and pressure drop within a 40°C–110°C saturation temperature range inside a plain tube with a 9-mm internal diameter. Sensitivity analysis highlighted the differences in condensation characteristics between high and low temperatures, and influencing mechanisms are revealed. Then, the measured data are employed to assess the accuracy of previous correlations. Based on the importance factor analysis result, adjustments are made to Reynolds number and flow regime boundaries. Finally, the correlations incorporating high temperature condensation of R245fa are developed, yielding a decrease in deviation from 17.6% to 7.23% for heat transfer and from 15.1% to 7.51% for frictional pressure drop gradient. Utilizing the newly developed models, 877 data points across 14 working fluids are predicted, results in a decrease in deviation from 18.85% to 10.65% for heat transfer coefficient, indicating a significant improvement in both accuracy and generality of the developed correlations.