Advanced heat transfer fluids for direct molten salt line-focusing CSP plants

Bonk, Alexander; Sau, Salvatore; Uranga, Nerea; Hernaíz, Marta; Bauer, Thomas

doi:10.1016/j.pecs.2018.02.002

Cited by 180 publications

(86 citation statements)

References 81 publications

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“…[12]. Thermophysical properties of molten salt are shown between equation (1) and (4) [5,13]. 22.714 0.12 2.281 10 1.474 10…”

Section: Model Description 21 Fluids Propertiesmentioning

confidence: 99%

“…Furthermore, the molten salts have some advantages over the thermal oil (e.g.low environmental effect). However, A significant problem arises when thermal oil and molten nitrate salts are completely changed, the molten salts exhibit a significantly higher melting point with the risk of freezing and / or filling / drainage of the solar field tubes [5]. Trabelsi et al [6] simulated the study with using molten salt and Therminol VP 1 in PTC, they showed that when molten salt is used as working fluid, the average energy efficiency increased by 6% and the LCOE decreased by approximately 20% compared to Therminol VP-1.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Arslan

Günerhan

2019

E3S Web Conf.

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In this study energetic and exergetic performances of parabolic trough collector is theoretically investigated by using 120 l/min synthetic ‘’Dowtherm A’’ oil , 1200 l/min Air at 100 bar (10 MPa) and 150 l/min molten salt which is mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3) which are widely used as heat transfer fluids. Fluids performance comparisons were performed with the LS-2 module, which is used with vacuum in annulus and Cermet as a selective coating. LS-2 module has 7.8 m receiver length and is 39 m2 aperture area. As a result, the maximum exergy efficiency of the molten salt, synthetic oil, Air to be 41.19% at 422 °C, 40.82% at 400 °C, 40.33% at 402 °C, respectively. The maximum exergy of air is higher than other working fluids up to 310 ° C but after about 310 ° C the exergy of the molten salt is higher than the others. The molten salt has the best energy efficiency at its operating temperatures (250 °C to 550 °C) than other working fluids.

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“…[12]. Thermophysical properties of molten salt are shown between equation (1) and (4) [5,13]. 22.714 0.12 2.281 10 1.474 10…”

Section: Model Description 21 Fluids Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Arslan

Günerhan

2019

E3S Web Conf.

View full text Add to dashboard Cite

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“…The thermodynamic data were calculated using Gibbs free energy of formation ðDG f Þ to determine the favourability of reaction using JANAF tables from NIST. 38 The Gibbs free energy for the reaction (DG) was calculated using the format in eqn (7).…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] Mixed molten salts have high heat-capacity, are chemically stable at elevated temperatures, and exhibit a tailorable melting point through compositional changes. A large body of work has been performed on uoride, nitrate, and carbonate salt mixtures, such as lithium beryllium uoride (FLiBe), [8][9][10][11] sodium potassium nitrate (NaNO 3 -KNO 3 ), 7,[12][13][14] lithium potassium carbonate (LiKCO 3 ), 15,16 and many others. [17][18][19] Chloride-based salt mixtures have several advantages over nitrates, carbonates, and uorides.…”

Section: Introductionmentioning

confidence: 99%

Enabling chloride salts for thermal energy storage: implications of salt purity

et al. 2019

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“…Because of their large specific heat capacity, low viscosity, wide temperature range, and good compatibility with containers, molten salts have been widely used as latent thermal storage media in solar power fields [9,10]. Molten salts are also used as HTFs to store sensible heat, and they are considered as an alternative to oils because of their low cost and harmlessness to the environment [11]. There are many studies conducted about molten salts, including their thermo-physical properties and system performances [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Rheological Characteristics of Molten Salt Seeded with Al2O3 Nanopowder and Graphene for Concentrated Solar Power

et al. 2019

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HITEC salt (NaNO2-NaO3-KNO3) and solar salt (NaO3-KNO3) are typical molten salts used in concentrated solar power. Adding nanoparticles is an effective method to improve the thermo-physical properties of pure salt. It is indispensable to experimentally study the rheological behaviours of salt seeded with nanoparticles, which can increase the specific heat capacity of pure salt. In this work, the viscosities of HITEC salt were measured with different shear rates in the temperature range of 200 °C to 450 °C firstly, while those of solar salt were measured in the temperature range of 250 °C to 500 °C. The experimental data showed reasonable agreement with the literature correlations, which verify the Newtonian behaviours of pure salts. The evolutions of the viscosities of nanocomposites in the same temperature range were measured and analysed, where the nanocomposites were synthesized with 1 wt.% or 2 wt.% Al2O3 nanopowder and graphene, respectively. Results showed that the addition of Al2O3 nanopowder had relatively little effect on viscosity, and the variations were about −35.4%~8.1% for the HITEC salt nanocomposites and −9.2%~68.1% for the solar salt nanocomposites. While graphene would apparently increase the viscosities of HITEC salt and solar salt, HITEC salt with the addition of graphene showed slight non-Newtonian fluid behaviour.

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Advanced heat transfer fluids for direct molten salt line-focusing CSP plants

Cited by 180 publications

References 81 publications

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Enabling chloride salts for thermal energy storage: implications of salt purity

Rheological Characteristics of Molten Salt Seeded with Al2O3 Nanopowder and Graphene for Concentrated Solar Power

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