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Can Nanosalts (Molten Salts Nanofluids) be alternative engineering fluids for high temperature applications? 
Thursday, 25 July 2019,  3:00
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Can Nanosalts (Molten Salts Nanofluids) be alternative engineering fluids for high temperature applications?

Prof. Carlos Nieto de Castro, Departamento de Química e Bioquímica, Universidade de Lisboa, Portugal

Nanofluids, stable dispersions of nanomaterials in base fluids have proved to be excellent alternatives to current heat transfer fluids, in many applications in chemistry and chemical engineering. IoNanofluids, when the base fluid is an ionic liquid (low temperature molten salt), also followed the same impact, with the special advantage of flexibility, negligible vapour pressure target oriented fluids. However its application to heat transfer fluids for high temperature applications, like CSPs, concentrated solar power plants, where a high temperature material, is necessary for heat transfer and storage is highly limited by thermal degradation and/or decomposition.


Molten salt storage systems offer the possibility to supply electrical production at constant conditions and became an interesting option as storage material because it has high energy density per specific volume and very high thermal inertia due to its high heat capacity and low thermal conductivity. CSP plants are a priority in EU because they have reduced the cost of electricity production, and substantial improvement in efficiency and reduction of costs in all CSP components is necessary to achieve the proposed LCOE target of 10 c€/kWh for 2030. Nanosalts (Molten Salts Nanofluids) are a flagship issue in the CSPs, as they can improve the thermal properties of molten salts as nanoparticles enhance the heat transfer and storage capabilities of High Temperature Nanofluids. Increments of up to 50% in the specific heat and 40% in the thermal conductivity have been reported.
However, producing nanosalts is not trivial, and most of the methods so far developed produce the dispersions at room temperature, evaporate the solvent to complete dryness (solid phase) and then fill the measuring cell in solid state, melt the sample and measure properties. Monitoring the molten nanosalt during the measurements to assure the stability of the nanofluid is therefore a very challenging task.


It is the purpose of this talk to discuss these problems and several experimental difficulties encountered in the accurate measurement of thermophysical properties of nanosalts, paving the way to propose these systems as alternative fluids for high temperature applications.

Location ICN2 Seminar Hall, ICN2 Building, UAB
Contact This email address is being protected from spambots. You need JavaScript enabled to view it.
https://icn2.cat/en/events/eventdetail/1121/can-nanosalts-molten-salts-nanofluids-be-alternative-engineering-fluids-for-high-temperature-applications

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