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Experimental analysis of charging and discharging processes, with parallel and counter flow arrangements, in a molten salts high temperature pilot plant scale setup

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  • Peiró, Gerard
  • Gasia, Jaume
  • Miró, Laia
  • Prieto, Cristina
  • Cabeza, Luisa F.

Abstract

Despite the fact that there are some commercial concentrated solar power plants worldwide, there is currently a lack of experimental reports about the operational characteristics of this type of plants. Therefore, a two-tank molten salts thermal energy storage (TES) pilot plant at the University of Lleida (Spain) was used to analyze charging and discharging processes under real conditions. In this facility, 1000kg of molten salts are used as TES material and Therminol VP-1 is used as heat transfer fluid (HTF). This facility is equipped with measurement equipment which allows an exhaustive analysis of the processes. In this study, the fact of varying the flow arrangement in the heat exchanger (parallel and counter flow arrangements) and the temperature difference between the molten salts and the HTF have been studied and discussed in terms of temperature profiles, energy and power stored/released from/to both HTF and molten salts, efficiencies and effectiveness. The best working conditions found were counter flow arrangement with a temperature grading of about 65°C.

Suggested Citation

  • Peiró, Gerard & Gasia, Jaume & Miró, Laia & Prieto, Cristina & Cabeza, Luisa F., 2016. "Experimental analysis of charging and discharging processes, with parallel and counter flow arrangements, in a molten salts high temperature pilot plant scale setup," Applied Energy, Elsevier, vol. 178(C), pages 394-403.
    • Handle: RePEc:eee:appene:v:178:y:2016:i:c:p:394-403
    DOI: 10.1016/j.apenergy.2016.06.032
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    1. González-Roubaud, Edouard & Pérez-Osorio, David & Prieto, Cristina, 2017. "Review of commercial thermal energy storage in concentrated solar power plants: Steam vs. molten salts," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 133-148.
    2. Cabeza, Luisa F. & de Gracia, Alvaro & Zsembinszki, Gabriel & Borri, Emiliano, 2021. "Perspectives on thermal energy storage research," Energy, Elsevier, vol. 231(C).
    3. David W. MacPhee & Mustafa Erguvan, 2020. "Thermodynamic Analysis of a High-Temperature Latent Heat Thermal Energy Storage System," Energies, MDPI, vol. 13(24), pages 1-19, December.
    4. Lappalainen, Jari & Hakkarainen, Elina & Sihvonen, Teemu & Rodríguez-García, Margarita M. & Alopaeus, Ville, 2019. "Modelling a molten salt thermal energy system – A validation study," Applied Energy, Elsevier, vol. 233, pages 126-145.
    5. Peiró, Gerard & Prieto, Cristina & Gasia, Jaume & Jové, Aleix & Miró, Laia & Cabeza, Luisa F., 2018. "Two-tank molten salts thermal energy storage system for solar power plants at pilot plant scale: Lessons learnt and recommendations for its design, start-up and operation," Renewable Energy, Elsevier, vol. 121(C), pages 236-248.
    6. 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.
    7. Solé, Aran & Falcoz, Quentin & Cabeza, Luisa F. & Neveu, Pierre, 2018. "Geometry optimization of a heat storage system for concentrated solar power plants (CSP)," Renewable Energy, Elsevier, vol. 123(C), pages 227-235.
    8. Chang Liu & Mao-Song Cheng & Bing-Chen Zhao & Zhi-Min Dai, 2017. "A Wind Power Plant with Thermal Energy Storage for Improving the Utilization of Wind Energy," Energies, MDPI, vol. 10(12), pages 1-20, December.
    9. Peiró, Gerard & Gasia, Jaume & Miró, Laia & Prieto, Cristina & Cabeza, Luisa F., 2017. "Influence of the heat transfer fluid in a CSP plant molten salts charging process," Renewable Energy, Elsevier, vol. 113(C), pages 148-158.

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