Advanced heat transfer fluids for direct molten salt line-focusing CSP plants
By A. Bonk, S. Sau, N. Uranga, M. Hernaiz, Thomas Bauer. Progress in Energy and Combustion Science, 2018
236 citations recorded by the source corpus.
Abstract Concentrating solar power coupled to thermal energy storage (TES) is a vastly growing industrial process allowing for the generation of dispatchable and green electricity. This paper focuses on direct molten salt line-focusing technology using linear Fresnel and parabolic trough collector systems. Direct molten salt technology utilizes molten salt as heat transfer fluid in solar field and TES medium. Nitrate salts can be applied since they cover a wide temperature range. As storage medium Solar Salt, a binary NaNO 3 − KNO 3 (60–40 wt%) mixture, is most commonly used but variations of this system have promising thermal properties in terms of a lower melting temperature to minimize the risk of undesired salt freezing events. These modified salts are typically ternary, ternary reciprocal or higher order systems formed by adding additional cations, anions or both. In this study five molten salt systems Solar Salt, HitecXL (CaKNa//NO3), LiNaK-Nitrate, Hitec (NaK//NO23) and CaLiNaK//NO23 are both investigated and critically reviewed. Their thermo-physical properties including phase diagrams, composition, melting ranges, melting temperature, minimum operation temperature, thermal stability, maximum operation temperature, density, heat capacity, thermal conductivity, viscosity and handling are evaluated and the most recommended values are discussed and highlighted. This review contributes to a better understanding of how the listed properties can be determined in terms of measurement conditions and provides temperature dependent data useful for future simulations of direct molten salt LF CSP plants.
Subfields: Mechanical Engineering, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/38ee44e9b8841662f5553ab694e46432f4e26c5e
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In Mechanical Engineering
In Renewable Energy, Sustainability and the Environment
Citations in the corpus
- Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials (2019, background): “Dispatchability in particular, makes CSP one of the most promising renewable energy technologies [2-5] in which nitrate salts are currently employed as TES and HTF materials [4,12-13].”
- Progress in Research and Development of Molten Chloride Salt Technology for Next Generation Concentrated Solar Power Plants (2021, background): “Note that most of the available testing procedures and methods for the molten salt properties are based on the commercial molten nitrate salts [7,87] and some discrepancy among measurement methods exists.”