Journal
APPLIED ENERGY
Volume 178, Issue -, Pages 394-403Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2016.06.032
Keywords
Concentrated solar power; Sensible heat storage; Two-tank; Molten salts; Heat exchanger; Parallel flow arrangement; Counter flow arrangement
Categories
Funding
- Spanish government [Fondo tecnologico IDI-20090393, ConSOLida CENIT 2008-1005, ENE2008-06687-C02-01/CON, ENE2011-28269-C03-02, ENE2011-22722, ULLE10-4E-1305, BES-2012-051861]
- Abengoa Solar NT
- European Commission [NoPIRSES-GA-2013-610692]
- European Union [657466]
- Departament d'Universitats, Recerca i Societat de la Informacio de la Generalitat de Catalunya [2016FI_B 00047]
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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, 1000 kg 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 degrees C. (C) 2016 Elsevier Ltd. All rights reserved.
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