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Demonstration of Mg(NO3)2·6H2O-based composite phase change material for practical-scale medium-low temperature thermal energy storage

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  • Zhao, B.C.
  • Li, T.X.
  • He, F.
  • Gao, J.C.
  • Wang, R.Z.

Abstract

This work focuses on the industrialization-oriented investigation of a latent heat storage using a magnesium nitrate hydrate-based composite phase change material. Three aspects of studies are included: (i) characterizations on the thermal-physical properties of the composite, (ii) explorations on the supercooling stability of the composite within continuous thermal cycles, and (iii) evaluations on the thermal performance of a pilot-scale storage unit. The results indicate that the freshly-prepared composite has a fusion heat of 147.9 ± 0.5 J g−1, a storage capacity of 253.5 ± 0.9 J g−1 within 70–110 °C. The PCM presents no significant degradation after 100 thermal cycles. The material performs a better supercooling stability than pure magnesium nitrate hexahydrate. The designed latent heat storage unit can achieve stable charges and discharges with an effective heat storage density of 33.5 ± 2.6 kWh m−3, a thermal efficiency of 88.1 ± 9.6% and a thermal loss of around 10% during a daily operation. In addition, the storage unit performs a higher latent heat release concentration as discharging rate drops and its effective storage capacity within 80–85 °C is over 4.3 times of water storage. The

Suggested Citation

  • Zhao, B.C. & Li, T.X. & He, F. & Gao, J.C. & Wang, R.Z., 2020. "Demonstration of Mg(NO3)2·6H2O-based composite phase change material for practical-scale medium-low temperature thermal energy storage," Energy, Elsevier, vol. 201(C).
    • Handle: RePEc:eee:energy:v:201:y:2020:i:c:s0360544220308185
    DOI: 10.1016/j.energy.2020.117711
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    References listed on IDEAS

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    1. Zhao, B.C. & Wang, R.Z., 2020. "A novel 3-D model of an industrial-scale tube-fin latent heat storage using salt hydrates with supercooling: A model validation," Energy, Elsevier, vol. 213(C).
    2. Yang Li & Caixia Wang & Jun Zong & Jien Ma & Youtong Fang, 2021. "Experimental Research of the Heat Storage Performance of a Magnesium Nitrate Hexahydrate-Based Phase Change Material for Building Heating," Energies, MDPI, vol. 14(21), pages 1-11, November.
    3. Hu, Yige & Wang, Hang & Chen, Hu & Ding, Yang & Liu, Changtian & Jiang, Feng & Ling, Xiang, 2023. "A novel hydrated salt-based phase change material for medium- and low-thermal energy storage," Energy, Elsevier, vol. 274(C).
    4. Wang, Lu & Guo, Leihong & Ren, Jianlin & Kong, Xiangfei, 2022. "Using of heat thermal storage of PCM and solar energy for distributed clean building heating: A multi-level scale-up research," Applied Energy, Elsevier, vol. 321(C).

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