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Exergy analysis of latent heat thermal energy storage for solar power generation accounting for constraints imposed by long-term operation and the solar day

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  • Shabgard, Hamidreza
  • Bergman, Theodore L.
  • Faghri, Amir

Abstract

A combined heat transfer and exergy analysis is developed and used to quantify the performance of a latent heat thermal energy storage system (LHTES) for solar power generation taking into account two practical constraints. First, for long-term operation the thermal energy stored must equal the thermal energy recovered. The second constraint is imposed by the 24 h day. To maximize the second-law performance of a particular latent heat storage system associated with a specific charging temperature, it is shown that a specific phase change temperature must be used in conjunction with a specific heat transfer fluid (HTF) inlet temperature during the discharge process, and a specific charging time. The second-law performance of the storage system can be improved, and potentially impractical operating conditions needed to maximize the second-law performance of the LHTES system can be avoided by modifying the heat transfer design of the energy storage system. Quantitatively, increasing the surface area of the phase change material (PCM) side by a factor of 10 results in a six-fold increase in the exergy extracted from the LHTES system. For a typical salt phase change material, the optimal phase change temperatures corresponding to charging HTF inlet temperatures of 560 °C and 800 °C are 475 °C and 715 °C, respectively.

Suggested Citation

  • Shabgard, Hamidreza & Bergman, Theodore L. & Faghri, Amir, 2013. "Exergy analysis of latent heat thermal energy storage for solar power generation accounting for constraints imposed by long-term operation and the solar day," Energy, Elsevier, vol. 60(C), pages 474-484.
    • Handle: RePEc:eee:energy:v:60:y:2013:i:c:p:474-484
    DOI: 10.1016/j.energy.2013.08.020
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    References listed on IDEAS

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    3. Xu, Ben & Li, Peiwen & Chan, Cholik, 2015. "Application of phase change materials for thermal energy storage in concentrated solar thermal power plants: A review to recent developments," Applied Energy, Elsevier, vol. 160(C), pages 286-307.
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    5. Xiao, X. & Zhang, P., 2015. "Numerical and experimental study of heat transfer characteristics of a shell-tube latent heat storage system: Part II – Discharging process," Energy, Elsevier, vol. 80(C), pages 177-189.
    6. Bi, Yuehong & Liu, Xiao & Jiang, Minghe, 2014. "Exergy analysis of a gas-hydrate cool storage system," Energy, Elsevier, vol. 73(C), pages 908-915.
    7. Tian, Shen & Ma, Jiahui & Shao, Shuangquan & Tian, Qingfeng & Wang, Zhiqiang & Zhang, Zheyu & Hu, Kaiyong, 2024. "Experimental and analytical study on continuous frozen/melting processes of latent thermal energy storage driven by bubble flow," Energy, Elsevier, vol. 290(C).

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