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<p>The intermittent nature of renewable energy sources challenges the delivery of a stable power supply. Thermal energy storage (TES) systems can address this issue by balancing the mismatch between energy generation and demand. This study experimentally investigates a helical coil heat exchanger incorporating PX52 microencapsulated phase change material (MEPCM) and a silicon carbide (SiC)-based nanofluid as the heat transfer fluid. The effects of inlet temperature and flow rate on TES performance were systematically examined, as these parameters significantly influence both charging and discharging processes. Experimental results were used to evaluate average temperature profiles, charging and discharging efficiency. During charging, the melting of PCM led to buoyancy-driven natural convection, enhancing heat transfer, whereas the discharging process was dominated by conduction. At inlet temperature of 70&#xa0;°C and flow rate of 200 LPH, the system stored approximately 1215&#xa0;kJ in 150&#xa0;min, while during discharging at 30&#xa0;°C and 200 LPH, it released 588&#xa0;kJ in 59&#xa0;min with the charging and discharging efficiency of 71% and 73%. These results underscore the importance of optimizing both heat transfer fluid properties and operational parameters for designing efficient MEPCM-based helical coil heat exchanger for renewable energy applications.</p>

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Performance Evaluation of a Microencapsulated PCM-Integrated Helical Coil Heat Exchanger Operated with SiC Nanofluid

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Bharathiraja R,
  • Mohamed Iqbal Shajahan,
  • Prakash K B,
  • Praveenkumar N

摘要

The intermittent nature of renewable energy sources challenges the delivery of a stable power supply. Thermal energy storage (TES) systems can address this issue by balancing the mismatch between energy generation and demand. This study experimentally investigates a helical coil heat exchanger incorporating PX52 microencapsulated phase change material (MEPCM) and a silicon carbide (SiC)-based nanofluid as the heat transfer fluid. The effects of inlet temperature and flow rate on TES performance were systematically examined, as these parameters significantly influence both charging and discharging processes. Experimental results were used to evaluate average temperature profiles, charging and discharging efficiency. During charging, the melting of PCM led to buoyancy-driven natural convection, enhancing heat transfer, whereas the discharging process was dominated by conduction. At inlet temperature of 70 °C and flow rate of 200 LPH, the system stored approximately 1215 kJ in 150 min, while during discharging at 30 °C and 200 LPH, it released 588 kJ in 59 min with the charging and discharging efficiency of 71% and 73%. These results underscore the importance of optimizing both heat transfer fluid properties and operational parameters for designing efficient MEPCM-based helical coil heat exchanger for renewable energy applications.