{"id":21048,"date":"2024-08-19T10:45:17","date_gmt":"2024-08-19T08:45:17","guid":{"rendered":"https:\/\/greth.fr\/?p=21048"},"modified":"2025-10-27T17:11:59","modified_gmt":"2025-10-27T16:11:59","slug":"eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/","title":{"rendered":"\u00c9co-conception d&#8217;un \u00e9changeur-stockeur thermique de type thermocline"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">In the context of greenhouse gases reduction, an increasing attention is dedicated to carbon\u2013free power plants solutions. To answer to this growing demand, tiny nuclear reactors or Small Modular Reactors (SMR), are being developed such as the 170Mwe Pressurized Water Reactor within the NUWARD project. This technology is downscaled, modular, with a very compact Steam Generators (SG) design in comparison to current recirculating SG. Moreover, the secondary fluid is vaporized through one unique passage in millimetric channels. However, such devices potentially include static (Ledinegg) and dynamic (density wave oscillations, \u2026) two-phase flow instabilities. These instabilities can alter the SG\u2019s efficiency, lifetime, and even integrity from modifying the temperature, mass flow and pressure levels. Consequently, it justifies a more precise analysis and understanding of the instability\u2019s mechanism. In this PhD, a thorough study of the Ledinegg instability and the flow maldistribution phenomenon is carried out in the compact plates SG\u2019s operating conditions. In a capillary dominated regime we consider a localized, infinitesimally thin interfacial front plunged into a forced longitudinal temperature gradient whereby vaporization arises leading to successive liquid-gas phases distribution within the channel. Whereas the liquid and vapor velocity profiles are provided by the Poiseuille\u2019s law, the temperature fields in the solid and the fluid are obtained using the generalized Graetz modes method, specifically adapted to the considered vaporization model. The generalized Graetz modes decomposition permits a semi-analytical solution of the 3D convection-diffusion problems provided that the velocity field, domain\u2019s section and Peclet\u2019s number are longitudinally invariant along the flow direction. In the first chapter, this methodology is used to analyse heat transfers in single-phase natural convection circulation loop. A new universal scaling law for the relation between the Grashof and the Reynolds numbers is obtained, this is confirmed by an asymptotic analysis and direct numerical simulations and is successfully compared with experimental data sets. This analysis has highlighted the influence of boundary conditions, boundary layers, and fluid to solid thermal conductivity ratio in the heat transfer control. In the second chapter, the generalized Graetz modes method is extended to solve the temperature fields as well as the two-phase interface position within the vaporization model. This methodology is applied to two configurations: a uniformly heated single channel and a co-current heat exchanger. The vaporization\u2019s numerical computation with imposed heat flux in a microchannel depicts the proportionality between the front\u2019s position and the liquid Peclet\u2019s number. The results are consistent with the theoretical energy balance analysis as well as with experimental data obtained in the literature for moderated mass flows and heating powers. Using the resulting interface\u2019s position law into a pressure drops model, the boundaries of the stability areas in a single heated microchannel and many parallel channels have been computed and analysed. In the case of the co-current heat exchanger, the state-of-the-art remains spotty because most of stability studies deals with imposed heat flux and thermally insulated channels, not relevant for conjugated heat transfers in a heat exchanger which deviate from such simplified assumptions. Our confined vaporization model predicts a logarithmic dependence between the two-phase interface\u2019s position and the secondary inlet Peclet\u2019s number. The influence of the fluid properties, primary mass flow and the wall thermal conductivity on this law has been studied and allowed to specify the stability criteria for a single heat exchanger and a network composed of parallel heat exchangers, closer to the compact plates\u2019 SG.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Diane LE ROUX<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2022, october 13th<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Thermocline thermal energy storage, Life cycle assessment, Exergy Multi-Criteria optimization, Levelised cost of energy<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div class=\"eds-animate edsanimate-sis-hidden\" data-eds-entry-animation=\"bounceIn\" data-eds-entry-delay=\"0\" data-eds-entry-duration=\"1\" data-eds-entry-timing=\"linear\" data-eds-exit-animation=\"\" data-eds-exit-delay=\"\" data-eds-exit-duration=\"\" data-eds-exit-timing=\"\" data-eds-repeat-count=\"1\" data-eds-keep=\"yes\" data-eds-animate-on=\"load\" data-eds-scroll-offset=\"\">\n\t\t<div class=\"box info\">\n\t\t\t<div class=\"box-inner-block\">\n\t\t\t\t<span class=\"fa tie-shortcode-boxicon\"><\/span>\n<p style=\"text-align: justify;\"><strong>&#x2666; The full version is only available for subscribers <a style=\"text-decoration: none;\" href=\"\/en\/offre-du-greth\/\"><span style=\"background-color: #3db2ea; color: #fff;\">\"ESSENTIEL\"<\/span><\/a> or <a style=\"text-decoration: none;\" href=\"\/en\/offre-du-greth\/\"><span style=\"background-color: #c6002c; color: #fff;\">\"PREMIUM\"<\/span><\/a> of GRETh!<\/strong><\/p>\n<p>&#x2666; If you are already a member \/ subscriber, you must identify yourself by <a href=\"\/wp-login.php\"><strong>clicking here<\/strong><\/a>.<br \/>\n&#x2666; If you are not a member, you can consult the offer proposed by GRETh by <a href=\"\/en\/offre-du-greth\/\"><strong>clicking here<\/strong><\/a> as well as the conditions of membership by <a href=\"\/en\/conditions-adhesion\/\"><strong>clicking here<\/strong><\/a>.\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>","protected":false},"excerpt":{"rendered":"<p>R\u00e9sum\u00e9 : Afin de relever les d\u00e9fis de la transition \u00e9nerg\u00e9tique, l\u2019enjeu r\u00e9side dans la mise en place de syst\u00e8mes techniquement performants, \u00e9conomiquement viables et respectueux de l\u2019environnement. Ces travaux de th\u00e8se portent sur l\u2019optimisation multi-crit\u00e8res d\u2019un stockage thermique de type thermocline, qui utilise une unique cuve pour stocker la chaleur. L\u2019objectif principal est de cr\u00e9er un outil d\u2019aide \u00e0 la d\u00e9cision permettant de s\u00e9lectionner les diff\u00e9rents \u00e9l\u00e9ments d\u2019un tel syst\u00e8me, selon des crit\u00e8res exerg\u00e9tique, environnemental et \u00e9conomique. L\u2019influence de la g\u00e9om\u00e9trie du r\u00e9servoir, de la granulom\u00e9trie des particules, du fluide caloporteur et des mat\u00e9riaux de garnissage utilis\u00e9s est \u00e9tudi\u00e9e afin d\u2019optimiser un stockage thermocline. Deux cas de r\u00e9f\u00e9rence sont consid\u00e9r\u00e9s : le premier permet de valoriser les chaleurs fatales perdues par les industries, et le second de stocker la chaleur issue des centrales solaires \u00e0 concentration.Le probl\u00e8me d\u2019optimisation tri-crit\u00e8res est r\u00e9solu \u00e0 l\u2019aide d&#8217;un algorithme g\u00e9n\u00e9tique multi-objectifs. Pour chaque couple fluide\/solide simul\u00e9, un ensemble de Pareto est obtenu. La m\u00e9thode multi-crit\u00e8res d\u2019aide \u00e0 la d\u00e9cision TOPSIS coupl\u00e9e \u00e0 l&#8217;entropie de Shannon est utilis\u00e9e pour s\u00e9lectionner la meilleure solution de compromis dans chaque ensemble de Pareto, \u00e9vitant ainsi tout choix subjectif de la part du d\u00e9cideur.Des r\u00e9servoirs de forme trapue sont pr\u00e9f\u00e9r\u00e9s pour maintenir un bon rendement exerg\u00e9tique, une empreinte environnementale mod\u00e9r\u00e9e et un faible LCOE. L&#8217;application de la m\u00e9thode TOPSIS\/Shannon conduit \u00e0 s\u00e9lectionner un mat\u00e9riau issu des d\u00e9chets comme le meilleur mat\u00e9riau de remplissage. Cette m\u00e9thodologie innovante peut-\u00eatre appliqu\u00e9e par la suite \u00e0 d\u2019autres syst\u00e8mes \u00e9nerg\u00e9tiques.<\/p>","protected":false},"author":1,"featured_media":962,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6853,6855,6854,6858,6859,6857,6852,6856],"class_list":["post-21048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-analyse-du-cycle-de-vie","tag-cout-actualise-de-lenergie","tag-exergie-optimisation-multi-criteres","tag-exergy-multi-criteria-optimization","tag-levelised-cost-of-energy","tag-life-cycle-assessment","tag-stockage-thermique-de-type-thermocline","tag-thermocline-thermal-energy-storage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u00c9co-conception d&#039;un \u00e9changeur-stockeur thermique de type thermocline - GRETh<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/greth.fr\/en\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9co-conception d&#039;un \u00e9changeur-stockeur thermique de type thermocline\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Afin de relever les d\u00e9fis de la transition \u00e9nerg\u00e9tique, l\u2019enjeu r\u00e9side dans la mise en place de syst\u00e8mes techniquement performants, \u00e9conomiquement viables et respectueux de l\u2019environnement. Ces travaux de th\u00e8se portent sur l\u2019optimisation multi-crit\u00e8res d\u2019un stockage thermique de type thermocline, qui utilise une unique cuve pour stocker la chaleur. L\u2019objectif principal est de cr\u00e9er un outil d\u2019aide \u00e0 la d\u00e9cision permettant de s\u00e9lectionner les diff\u00e9rents \u00e9l\u00e9ments d\u2019un tel syst\u00e8me, selon des crit\u00e8res exerg\u00e9tique, environnemental et \u00e9conomique. L\u2019influence de la g\u00e9om\u00e9trie du r\u00e9servoir, de la granulom\u00e9trie des particules, du fluide caloporteur et des mat\u00e9riaux de garnissage utilis\u00e9s est \u00e9tudi\u00e9e afin d\u2019optimiser un stockage thermocline. Deux cas de r\u00e9f\u00e9rence sont consid\u00e9r\u00e9s : le premier permet de valoriser les chaleurs fatales perdues par les industries, et le second de stocker la chaleur issue des centrales solaires \u00e0 concentration.Le probl\u00e8me d\u2019optimisation tri-crit\u00e8res est r\u00e9solu \u00e0 l\u2019aide d&#039;un algorithme g\u00e9n\u00e9tique multi-objectifs. Pour chaque couple fluide\/solide simul\u00e9, un ensemble de Pareto est obtenu. La m\u00e9thode multi-crit\u00e8res d\u2019aide \u00e0 la d\u00e9cision TOPSIS coupl\u00e9e \u00e0 l&#039;entropie de Shannon est utilis\u00e9e pour s\u00e9lectionner la meilleure solution de compromis dans chaque ensemble de Pareto, \u00e9vitant ainsi tout choix subjectif de la part du d\u00e9cideur.Des r\u00e9servoirs de forme trapue sont pr\u00e9f\u00e9r\u00e9s pour maintenir un bon rendement exerg\u00e9tique, une empreinte environnementale mod\u00e9r\u00e9e et un faible LCOE. L&#039;application de la m\u00e9thode TOPSIS\/Shannon conduit \u00e0 s\u00e9lectionner un mat\u00e9riau issu des d\u00e9chets comme le meilleur mat\u00e9riau de remplissage. Cette m\u00e9thodologie innovante peut-\u00eatre appliqu\u00e9e par la suite \u00e0 d\u2019autres syst\u00e8mes \u00e9nerg\u00e9tiques.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/\" \/>\n<meta property=\"og:site_name\" content=\"GRETh\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/grethfr\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/grethfr\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-08-19T08:45:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-27T16:11:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-6.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"387\" \/>\n\t<meta property=\"og:image:height\" content=\"310\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"GRETh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@grethfr\" \/>\n<meta name=\"twitter:site\" content=\"@grethfr\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"GRETh\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/greth.fr\\\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\\\/\"},\"author\":{\"name\":\"GRETh\",\"@id\":\"https:\\\/\\\/greth.fr\\\/#\\\/schema\\\/person\\\/6e173032c4ce46c14339ff999b721f00\"},\"headline\":\"\u00c9co-conception d&#8217;un \u00e9changeur-stockeur thermique de type thermocline\",\"datePublished\":\"2024-08-19T08:45:17+00:00\",\"dateModified\":\"2025-10-27T16:11:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\\\/\"},\"wordCount\":1275,\"publisher\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/greth.fr\\\/wp-content\\\/uploads\\\/2015\\\/08\\\/theses-6.jpg\",\"keywords\":[\"Analyse du cycle de vie\",\"Co\u00fbt actualis\u00e9 de l\u2019\u00e9nergie\",\"Exergie Optimisation multi-Crit\u00e8res\",\"Exergy Multi-Criteria optimization\",\"Levelised cost of energy\",\"Life cycle assessment\",\"Stockage thermique de type thermocline\",\"Thermocline thermal energy storage\"],\"articleSection\":[\"Documents\",\"M\u00e9moires de th\u00e8ses\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/greth.fr\\\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\\\/\",\"url\":\"https:\\\/\\\/greth.fr\\\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\\\/\",\"name\":\"\u00c9co-conception d'un \u00e9changeur-stockeur thermique de type thermocline - 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GRETh","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/greth.fr\/en\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/","og_locale":"en_US","og_type":"article","og_title":"\u00c9co-conception d'un \u00e9changeur-stockeur thermique de type thermocline","og_description":"R\u00e9sum\u00e9 : Afin de relever les d\u00e9fis de la transition \u00e9nerg\u00e9tique, l\u2019enjeu r\u00e9side dans la mise en place de syst\u00e8mes techniquement performants, \u00e9conomiquement viables et respectueux de l\u2019environnement. Ces travaux de th\u00e8se portent sur l\u2019optimisation multi-crit\u00e8res d\u2019un stockage thermique de type thermocline, qui utilise une unique cuve pour stocker la chaleur. L\u2019objectif principal est de cr\u00e9er un outil d\u2019aide \u00e0 la d\u00e9cision permettant de s\u00e9lectionner les diff\u00e9rents \u00e9l\u00e9ments d\u2019un tel syst\u00e8me, selon des crit\u00e8res exerg\u00e9tique, environnemental et \u00e9conomique. L\u2019influence de la g\u00e9om\u00e9trie du r\u00e9servoir, de la granulom\u00e9trie des particules, du fluide caloporteur et des mat\u00e9riaux de garnissage utilis\u00e9s est \u00e9tudi\u00e9e afin d\u2019optimiser un stockage thermocline. Deux cas de r\u00e9f\u00e9rence sont consid\u00e9r\u00e9s : le premier permet de valoriser les chaleurs fatales perdues par les industries, et le second de stocker la chaleur issue des centrales solaires \u00e0 concentration.Le probl\u00e8me d\u2019optimisation tri-crit\u00e8res est r\u00e9solu \u00e0 l\u2019aide d'un algorithme g\u00e9n\u00e9tique multi-objectifs. Pour chaque couple fluide\/solide simul\u00e9, un ensemble de Pareto est obtenu. La m\u00e9thode multi-crit\u00e8res d\u2019aide \u00e0 la d\u00e9cision TOPSIS coupl\u00e9e \u00e0 l'entropie de Shannon est utilis\u00e9e pour s\u00e9lectionner la meilleure solution de compromis dans chaque ensemble de Pareto, \u00e9vitant ainsi tout choix subjectif de la part du d\u00e9cideur.Des r\u00e9servoirs de forme trapue sont pr\u00e9f\u00e9r\u00e9s pour maintenir un bon rendement exerg\u00e9tique, une empreinte environnementale mod\u00e9r\u00e9e et un faible LCOE. L'application de la m\u00e9thode TOPSIS\/Shannon conduit \u00e0 s\u00e9lectionner un mat\u00e9riau issu des d\u00e9chets comme le meilleur mat\u00e9riau de remplissage. Cette m\u00e9thodologie innovante peut-\u00eatre appliqu\u00e9e par la suite \u00e0 d\u2019autres syst\u00e8mes \u00e9nerg\u00e9tiques.","og_url":"https:\/\/greth.fr\/en\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/","og_site_name":"GRETh","article_publisher":"https:\/\/www.facebook.com\/grethfr\/","article_author":"https:\/\/www.facebook.com\/grethfr\/","article_published_time":"2024-08-19T08:45:17+00:00","article_modified_time":"2025-10-27T16:11:59+00:00","og_image":[{"width":387,"height":310,"url":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-6.jpg","type":"image\/jpeg"}],"author":"GRETh","twitter_card":"summary_large_image","twitter_creator":"@grethfr","twitter_site":"@grethfr","twitter_misc":{"Written by":"GRETh","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/greth.fr\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/#article","isPartOf":{"@id":"https:\/\/greth.fr\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/"},"author":{"name":"GRETh","@id":"https:\/\/greth.fr\/#\/schema\/person\/6e173032c4ce46c14339ff999b721f00"},"headline":"\u00c9co-conception d&#8217;un \u00e9changeur-stockeur thermique de type thermocline","datePublished":"2024-08-19T08:45:17+00:00","dateModified":"2025-10-27T16:11:59+00:00","mainEntityOfPage":{"@id":"https:\/\/greth.fr\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/"},"wordCount":1275,"publisher":{"@id":"https:\/\/greth.fr\/#organization"},"image":{"@id":"https:\/\/greth.fr\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/#primaryimage"},"thumbnailUrl":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-6.jpg","keywords":["Analyse du cycle de vie","Co\u00fbt actualis\u00e9 de l\u2019\u00e9nergie","Exergie Optimisation multi-Crit\u00e8res","Exergy Multi-Criteria optimization","Levelised cost of energy","Life cycle assessment","Stockage thermique de type thermocline","Thermocline thermal energy storage"],"articleSection":["Documents","M\u00e9moires de th\u00e8ses"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/greth.fr\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/","url":"https:\/\/greth.fr\/eco-conception-dun-echangeur-stockeur-thermique-de-type-thermocline\/","name":"\u00c9co-conception d'un \u00e9changeur-stockeur thermique de type thermocline - 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