Ternary Molten Salt Heat Transfer Fluids for Energy Applications

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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Heat Transfer Fluids and Systems for Process and Energy Applications

10.1201/9781003065272 ◽

2020 ◽

Author(s):

Jasbir Singh

Keyword(s):

Heat Transfer ◽

Energy Applications ◽

Heat Transfer Fluids

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

Progress in Energy and Combustion Science ◽

10.1016/j.pecs.2018.02.002 ◽

2018 ◽

Vol 67 ◽

pp. 69-87 ◽

Cited By ~ 61

Author(s):

Alexander Bonk ◽

Salvatore Sau ◽

Nerea Uranga ◽

Marta Hernaiz ◽

Thomas Bauer

Keyword(s):

Heat Transfer ◽

Molten Salt ◽

Heat Transfer Fluids

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Analytical Modeling and Experimental Measurements of Ternary Molten Salt Heat Transfer Fluids for Energy Applications

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D ◽

10.1115/imece2012-86802 ◽

2012 ◽

Cited By ~ 2

Author(s):

Kevin Coscia ◽

Sudhakar Neti ◽

Alparslan Oztekin ◽

Tucker Elliot ◽

Satish Mohapatra

Keyword(s):

Heat Transfer ◽

Heat Transfer Fluid ◽

Scanning Calorimetry ◽

Energy Applications ◽

Gas Processing ◽

Heat Transfer Fluids ◽

Melting Temperatures ◽

High Temperature Processes ◽

Freezing Temperatures ◽

Current Energy

One of the major impediments of current energy applications is the availability of an economical and reliable heat transfer fluid. Such applications include concentrated solar power, gas processing, petrochemicals, nuclear, and other high-temperature processes. Organic heat transfer fluids currently in use have limitations approaching 390°C, and other salt-based fluids have rather high freezing temperatures. Ternary nitrate salts have the potential to operate at high temperatures while maintaining low freezing temperatures. Some melting temperatures of LiNO3-NaNO3-KNO3 salt mixtures as a function of LiNO3 composition have been investigated using differential scanning calorimetry. Phase diagrams have also been predicted for the LiNO3-NaNO3-KNO3, CsNO3-NaNO3-KNO3, and CsNO3-LiNO3-KNO3 systems using mathematical modeling and the results are encouraging. The results presented in this work are expected to make a significant impact on the development of economical and practical ternary nitrate mixtures in energy applications.

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