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Experimental analysis of a coiled stirred tank containing a low cost PCM emulsion as a thermal energy storage system

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  • Delgado, M.
  • Lázaro, A.
  • Mazo, J.
  • Peñalosa, C.
  • Marín, J.M.
  • Zalba, B.

Abstract

This article presents the results of heat transfer coefficient and volumetric energy density measurements in an agitated tank containing a low-cost phase change material emulsion, heated by water flowing in a coil. For the stirring a three-stage impeller is placed in the central axis of a 46 l commercial tank. By measuring the temperature dependency on time and solving the transient enthalpy balance, the heat transfer coefficient between the helical coil and the agitated phase change material emulsion is determined, based on the impeller Reynolds number. The thermal energy storage efficiency has also been analysed. This phase change material emulsion shows a phase change temperature range between 30 and 50 °C. Its solid content is about 60% with an average size of 1 μm. The results have shown that the overall heat transfer coefficient is around 3.5–5.5 times higher when a stirring rate of 290–600 rpm is used. Furthermore, even at the lowest stirring rate, the thermal energy storage efficiency improves from 76-77%–100%, without detriment to the energy consumption of the stirrer.

Suggested Citation

  • Delgado, M. & Lázaro, A. & Mazo, J. & Peñalosa, C. & Marín, J.M. & Zalba, B., 2017. "Experimental analysis of a coiled stirred tank containing a low cost PCM emulsion as a thermal energy storage system," Energy, Elsevier, vol. 138(C), pages 590-601.
    • Handle: RePEc:eee:energy:v:138:y:2017:i:c:p:590-601
    DOI: 10.1016/j.energy.2017.07.044
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    2. Egea, A. & García, A. & Herrero-Martín, R. & Pérez-García, J., 2022. "Experimental performance of a novel scraped surface heat exchanger for latent energy storage for domestic hot water generation," Renewable Energy, Elsevier, vol. 193(C), pages 870-878.
    3. Boldoo, Tsogtbilegt & Chinnasamy, Veerakumar & Cho, Honghyun, 2024. "Enhancing efficiency and sustainability: Utilizing high energy density paraffin-based various PCM emulsions for low-medium temperature applications," Energy, Elsevier, vol. 303(C).
    4. Liu, Liu & Zhang, Xiyao & Liang, Haobin & Niu, Jianlei & Wu, Jian-Yong, 2022. "Cooling storage performance of a novel phase change material nano-emulsion for room air-conditioning in a self-designed pilot thermal storage unit," Applied Energy, Elsevier, vol. 308(C).
    5. Tian, Fengguo & Zhan, Xiaoqiang & He, Hao & Liu, Shulei & Yang, Tao & Xiao, Honghai, 2024. "A modified lumped capacitance method for transient heat transfer in a stirred tank with non-Newtonian fluid," Applied Energy, Elsevier, vol. 368(C).

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