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Open AccessArticle

Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization

1
E.T.S. Ingenieros Industriales-UNED, C/Juan del Rosal 12, 28040 Madrid, Spain
2
Rafael Mariño Chair in New Energy Technologies–COMILLAS-ICAI, C/Alberto Aguilera 25, 28015 Madrid, Spain
*
Author to whom correspondence should be addressed.
Entropy 2020, 22(8), 883; https://doi.org/10.3390/e22080883
Received: 16 July 2020 / Revised: 31 July 2020 / Accepted: 8 August 2020 / Published: 12 August 2020
(This article belongs to the Special Issue Thermodynamic Optimization of Complex Energy Systems)
One of the ways to make cost-competitive electricity, from concentrated solar thermal energy, is increasing the thermoelectric conversion efficiency. To achieve this objective, the most promising scheme is a molten salt central receiver, coupled to a supercritical carbon dioxide cycle. A key element to be developed in this scheme is the molten salt-to-CO2 heat exchanger. This paper presents a heat exchanger design that avoids the molten salt plugging and the mechanical stress due to the high pressure of the CO2, while improving the heat transfer of the supercritical phase, due to its compactness with a high heat transfer area. This design is based on a honeycomb-like configuration, in which a thermal unit consists of a circular channel for the molten salt surrounded by six smaller trapezoidal ducts for the CO2. Further, an optimization based on the exergy destruction minimization has been accomplished, obtained the best working conditions of this heat exchanger: a temperature approach of 50 °C between both streams and a CO2 pressure drop of 2.7 bar. View Full-Text
Keywords: Solar Thermal Power Plants; supercritical CO2 cycles; MS-to-CO2 heat exchanger; thermo-economic optimization; exergy destruction minimization Solar Thermal Power Plants; supercritical CO2 cycles; MS-to-CO2 heat exchanger; thermo-economic optimization; exergy destruction minimization
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MDPI and ACS Style

Montes, M.J.; Linares, J.I.; Barbero, R.; Moratilla, B.Y. Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization. Entropy 2020, 22, 883. https://doi.org/10.3390/e22080883

AMA Style

Montes MJ, Linares JI, Barbero R, Moratilla BY. Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization. Entropy. 2020; 22(8):883. https://doi.org/10.3390/e22080883

Chicago/Turabian Style

Montes, María J.; Linares, José I.; Barbero, Rubén; Moratilla, Beatriz Y. 2020. "Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization" Entropy 22, no. 8: 883. https://doi.org/10.3390/e22080883

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