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Experimental and Numerical Optimization Study on Performance of Phase-Change Thermal Energy Storage System

Author

Listed:
  • Yuqing Tang

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Neng Zhu

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Siqi Li

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

  • Yingzhen Hou

    (School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China)

Abstract

Promoting the use of solar energy resources has always involved the challenges of instability and supply–demand mismatch. The key to solving these issues is to efficiently store and utilize solar energy resources using high-performance heat storage devices. This study designed a high-performance shell-and-tube phase-change thermal storage device and established a numerical model using ANSYS software to summarize the device’s dynamic melting law. To verify the accuracy of the numerical simulation, a performance testing platform for the phase-change thermal storage device was built to investigate the impact of various factors, such as the inlet water temperature, inlet water flow rate, type of heat storage, and initial temperature of the device, and to reveal the change law of the device’s performance. The results show that the inlet water temperature has the most significant impact on the device’s heat storage and release performance. When the device’s heat storage or release is used for heating, changing the inlet water flow rate has a weak and limited effect on the device’s performance. However, when the device’s heat release is used to provide domestic hot water, increasing the make-up water temperature and reducing the inlet water flow rate can significantly improve the device’s effective heat release. Furthermore, based on the experimental validation of the model’s correctness, this study further simulated and studied the impact of different factors on the device’s heat storage process to optimize its structural design and provide technical references for the device’s actual operation and installation. The results show that the placement of fins has a negligible effect on the performance of the heat storage device while reducing the fin spacing and increasing the fin thickness can significantly improve the melting efficiency of the phase-change material (PCM). Additionally, the heat storage characteristics of the device are significantly better in the vertical installation mode than in the horizontal installation mode. This study provides theoretical guidance and technical references for the design and use of phase-change thermal storage devices.

Suggested Citation

  • Yuqing Tang & Neng Zhu & Siqi Li & Yingzhen Hou, 2023. "Experimental and Numerical Optimization Study on Performance of Phase-Change Thermal Energy Storage System," Energies, MDPI, vol. 16(10), pages 1-39, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:10:p:4148-:d:1149277
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    References listed on IDEAS

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    2. Tay, N.H.S. & Bruno, F. & Belusko, M., 2013. "Comparison of pinned and finned tubes in a phase change thermal energy storage system using CFD," Applied Energy, Elsevier, vol. 104(C), pages 79-86.
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    4. Kalapala, Lokesh & Devanuri, Jaya Krishna, 2020. "Energy and exergy analyses of latent heat storage unit positioned at different orientations – An experimental study," Energy, Elsevier, vol. 194(C).
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