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<p>The thermal performance of stearic acid/paraffin wax composite (SPC)-based rectangular thermal energy storage unit (RTU) has been investigated through heat pipe vacuum tube solar collector (HVSC) in the present experimental study. A copper tube and aluminum finned heat exchanger is used to improve the heat transfer rate in the RTU, and HYTHERM 600 is used to melt the SPC through HVSC. Heat transfer happens primarily via conduction during the initial melting phases, whereas conduction and natural convection happen when the SPC is liquefied in the RTU. Conduction occurs inside and natural convection occurs outside the RTU during the solidification operation. The results revealed that the variation in solar radiation affects the melting duration of SPC. The energy stored and rejected by SPC decreases with the PW mass percentage in SPC. C3 (50% SA + 50% PW) requires the minimum melting time owing to the collective impact of thermal conductivity and specific heat of SA and PW in SPC. All SPC samples require almost the same solidification time within the same temperature range. The trend of RTU, HVSC, and overall efficiency is initially increasing, reaching a maximum, and declining as the SA mass percentage increases. C3 exhibits the minimum melting time (118&#xa0;min) and maximum RTU (70.21%), HVSC (4.87%), and overall efficiency (3.42%) among all the SPC samples. The melting performance of C3 through HVSC renders it better suited for incorporation into thermal energy storage systems designed for space and water heating.</p>

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Experimental analysis of stearic acid/paraffin wax composite PCM in a rectangular thermal energy storage unit integrated with heat pipe vacuum tube solar collector

  • 期刊论文

  • 发表日期：

    2025年6月29日

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  • Dinesh Kumar Saini,
  • Chandrashekara Muniyappa,
  • Avadhesh Yadav

摘要

The thermal performance of stearic acid/paraffin wax composite (SPC)-based rectangular thermal energy storage unit (RTU) has been investigated through heat pipe vacuum tube solar collector (HVSC) in the present experimental study. A copper tube and aluminum finned heat exchanger is used to improve the heat transfer rate in the RTU, and HYTHERM 600 is used to melt the SPC through HVSC. Heat transfer happens primarily via conduction during the initial melting phases, whereas conduction and natural convection happen when the SPC is liquefied in the RTU. Conduction occurs inside and natural convection occurs outside the RTU during the solidification operation. The results revealed that the variation in solar radiation affects the melting duration of SPC. The energy stored and rejected by SPC decreases with the PW mass percentage in SPC. C3 (50% SA + 50% PW) requires the minimum melting time owing to the collective impact of thermal conductivity and specific heat of SA and PW in SPC. All SPC samples require almost the same solidification time within the same temperature range. The trend of RTU, HVSC, and overall efficiency is initially increasing, reaching a maximum, and declining as the SA mass percentage increases. C3 exhibits the minimum melting time (118 min) and maximum RTU (70.21%), HVSC (4.87%), and overall efficiency (3.42%) among all the SPC samples. The melting performance of C3 through HVSC renders it better suited for incorporation into thermal energy storage systems designed for space and water heating.