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An experimental investigation of the heat transfer and energy storage characteristics of a compact latent heat thermal energy storage system for domestic hot water applications

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  • Fadl, Mohamed
  • Eames, Philip C.

Abstract

This paper presents the experimental performance analysis of a latent heat thermal energy storage system (LHTESS) designed for domestic hot water (DHW) applications. The designed, fabricated and characterised thermal store comprised of a vertically oriented multi-pass tube heat exchanger in a rectangular cross-section container filled with phase change material (PCM) paraffin wax RT44HC. The experimental investigation evaluated the heat transfer within the system, measured the transient temperature distribution, determined the cumulative thermal energy stored, charging and discharging time and the instantaneous charging and discharging power. The experimental work was conducted under controlled experimental conditions using different heat transfer fluid (HTF) inlet temperatures and different volume flow rates for store charging and discharging. It was found that during charging natural convection in the melt played a significant role. During discharging thermal conduction dominates and natural convection has an insignificant impact on the LHTESS performance. This is due to the development of a solid layer of PCM around the heat transfer tubes which increases the thermal resistance and reduces heat transfer to the liquid PCM. Higher HTF inlet temperature during charging significantly decreased store charging time. Increasing HTF inlet temperature from 60 to 70 °C shortened the charging time by 3.5 h, a further increase to 80 °C decreased melting time by a further 2 h.

Suggested Citation

  • Fadl, Mohamed & Eames, Philip C., 2019. "An experimental investigation of the heat transfer and energy storage characteristics of a compact latent heat thermal energy storage system for domestic hot water applications," Energy, Elsevier, vol. 188(C).
    • Handle: RePEc:eee:energy:v:188:y:2019:i:c:s0360544219317785
    DOI: 10.1016/j.energy.2019.116083
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    4. Haichuan Zhao & Ning Yan & Zuoxia Xing & Lei Chen & Libing Jiang, 2020. "Thermal Calculation and Experimental Investigation of Electric Heating and Solid Thermal Storage System," Energies, MDPI, vol. 13(20), pages 1-20, October.
    5. Mohamed Fadl & Philip Eames, 2020. "Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System," Energies, MDPI, vol. 13(23), pages 1-23, November.
    6. Daniela Dzhonova-Atanasova & Aleksandar Georgiev & Svetoslav Nakov & Stela Panyovska & Tatyana Petrova & Subarna Maiti, 2022. "Compact Thermal Storage with Phase Change Material for Low-Temperature Waste Heat Recovery—Advances and Perspectives," Energies, MDPI, vol. 15(21), pages 1-21, November.
    7. Egea, A. & Solano, J.P. & Pérez-García, J. & García, A., 2020. "Solar-driven melting dynamics in a shell and tube thermal energy store: An experimental analysis," Renewable Energy, Elsevier, vol. 154(C), pages 1044-1052.

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