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Use of partial load operating conditions for latent thermal energy storage management

Author

Listed:
  • Gasia, Jaume
  • de Gracia, Alvaro
  • Peiró, Gerard
  • Arena, Simone
  • Cau, Giorgio
  • Cabeza, Luisa F.

Abstract

A proper management of thermal energy storage (TES) charging and discharging processes allows the final users to optimize the performance of TES systems. In this paper, an experimental research is carried out to study how the percentage of charge in a latent heat TES system (partial load operating conditions) influences the discharge process. Several charging and discharging processes were performed at a constant heat transfer fluid (HTF) mass flow rate of 0.5 kg/s and temperature of 155 °C and 105 °C, respectively. High density polyethylene (HDPE) with a total mass of 99.5 kg was used as phase change material (PCM) in a 0.154 m3 storage tank based on the shell-and-tube heat exchanger concept. Five different percentages of charge have been studied: 58 %, 73 %, 83 %, 92 %, and 97 % (baseline test). Results showed that by modifying the percentage of charge, the time required for the charging process was reduced between 97.2% and 68.8% in comparison to the baseline case. However, the energy accumulated was only reduced a maximum of 35.1% and a minimum of 5.2%, while the heat transfer rates during the first 60 min of discharge were reduced a maximum of 45.8% and a minimum of 6%. Therefore, partially charging the TES system not lower than 85% of its maximum energy capacity becomes a good option if the final application accepts a maximum decrease of discharging heat transfer rates of 10% if compared to the fully charged system.

Suggested Citation

  • Gasia, Jaume & de Gracia, Alvaro & Peiró, Gerard & Arena, Simone & Cau, Giorgio & Cabeza, Luisa F., 2018. "Use of partial load operating conditions for latent thermal energy storage management," Applied Energy, Elsevier, vol. 216(C), pages 234-242.
    • Handle: RePEc:eee:appene:v:216:y:2018:i:c:p:234-242
    DOI: 10.1016/j.apenergy.2018.02.061
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    References listed on IDEAS

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    Cited by:

    1. Choi, Sung Ho & Sohn, Dong Kee & Ko, Han Seo, 2021. "Performance enhancement of latent heat thermal energy storage by bubble-driven flow," Applied Energy, Elsevier, vol. 302(C).
    2. Scharinger-Urschitz, Georg & Schwarzmayr, Paul & Walter, Heimo & Haider, Markus, 2020. "Partial cycle operation of latent heat storage with finned tubes," Applied Energy, Elsevier, vol. 280(C).
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    4. Gasia, Jaume & de Gracia, Alvaro & Zsembinszki, Gabriel & Cabeza, Luisa F., 2019. "Influence of the storage period between charge and discharge in a latent heat thermal energy storage system working under partial load operating conditions," Applied Energy, Elsevier, vol. 235(C), pages 1389-1399.
    5. Romaní, Joaquim & Gasia, Jaume & Solé, Aran & Takasu, Hiroki & Kato, Yukitaka & Cabeza, Luisa F., 2019. "Evaluation of energy density as performance indicator for thermal energy storage at material and system levels," Applied Energy, Elsevier, vol. 235(C), pages 954-962.

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