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

Montes, María José, Linares, José Ignacio, Barbero, Rubén y Moratilla, Beatriz Yolanda . (2020) Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger using Exergy Destruction Minimization. Entropy, 22, 883

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Título Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger using Exergy Destruction Minimization
Autor(es) Montes, María José
Linares, José Ignacio
Barbero, Rubén
Moratilla, Beatriz Yolanda
Materia(s) Energías Renovables
Abstract 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.
Palabras clave solar thermal power plants
supercritical CO2 cycles
MS-to-CO2 heat exchanger
thermo-economic optimization
exergy destruction minimization
Editor(es) MDPI
Fecha 2020-08-08
Formato application/pdf
Identificador bibliuned:DptoIE-ETSI-ACES2030-0005
http://e-spacio.uned.es/fez/view/bibliuned:DptoIE-ETSI-ACES2030-0005
DOI - identifier https://doi.org/10.3390/e22080883
Publicado en la Revista Entropy, 22, 883
Idioma eng
Versión de la publicación acceptedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales This is the Accepted Manuscript of an article published by MDPI in "Entropy" on 12 August 2020, available online: https://doi.org/10.3390/e22080883 -- Este es el manuscrito aceptado de un artículo publicado por MDPI en "Entropy" el 12 agosto 2020, disponible en línea: https://doi.org/10.3390/e22080883
Notas adicionales Proyecto ACES2030-CM (Alta Concentración Energía Solar) S2018/EMT4319

 
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Creado: Tue, 16 Nov 2021, 23:48:14 CET