{"id":21040,"date":"2024-08-19T10:05:52","date_gmt":"2024-08-19T08:05:52","guid":{"rendered":"https:\/\/greth.fr\/?p=21040"},"modified":"2025-10-27T17:16:07","modified_gmt":"2025-10-27T16:16:07","slug":"etude-dun-cycle-organique-de-rankine-couple-a-un-systeme-passif-innovant-application-aux-reacteurs-nucleaires-avances","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/etude-dun-cycle-organique-de-rankine-couple-a-un-systeme-passif-innovant-application-aux-reacteurs-nucleaires-avances\/","title":{"rendered":"Etude d\u2019un cycle organique de Rankine coupl\u00e9 \u00e0 un syst\u00e8me passif innovant : application aux r\u00e9acteurs nucl\u00e9aires avanc\u00e9s"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">This work contributes to the design of passive backup systems for pressurized water reactors (PWRs) in use today.The reactor core residual power is the heat produced by the fission products left over after the nuclear reaction in the core has stopped. Passive safety condensers are one method for eliminating this power by using a large amount of water placed very high up, allowing residual heat to be removed naturally through convection. This uses a large amount of water that takes a long time to heat up to boiling temperature.The fundamental concept is to use a portion of the energy contained in this volume of boiling water as a heat source for a thermodynamic cycle through an immersed heat exchanger. The cycle power output will be used to supplement existing resources by providing electricity to various operating components on its own.The conversion of low and medium-temperature (< 150 \u00b0C) industrial or renewable (biomass, solar, geothermal) waste heat into electricity is a key challenge in energy efficiency. The organic Rankine cycle (ORC), which has been used on both laboratory and industrial scales for about ten years, is one potential method for capturing this heat.The nature of the hot source and the requirement for robustness and reliability in the system are two peculiarities related to the context of this work. In addition to the typical constraints imposed on this type of cycle, such as maximizing energy performance, respecting the environment, and minimizing space requirements.The purpose of the thesis was to investigate the behaviour of this complex system based on an ORC cycle using a methodology that combined modelling and experimentation, and thereby contribute to proving the validity of the selected approach. More specifically, an experimental test bench simulating the coupling between an ORC and a boiling water tank was dimensioned using a theoretical model. Thus, the satisfactory operation of the cycle and its adaptability to specific non-nominal conditions, such as an increase in the cold source temperature, the presence of liquid droplets at the turbine inlet, or the effects of a the working fluid charge in the ORC circuit, were both experimentally investigated. The ORC in the studied range have proven to be extremely reliable for a number of working fluids (Novec649TM, HFE7100) based on all of these off-design criteria. Architectural studies that were specifically focused on the coupling of ORC and water tank were also completed, with particular attention paid to the position of the evaporator immersed in the tank and the imposed power variation.All of these experimental findings aided the numerical simulations and theoretical models of the EES software. Finally, using these models allowed us to size the ORC on an industrial scale and make suggestions. These are specifically related to the ORC and condenser pool coupling architecture, as well as the multi-criteria analysis used to select the working fluid.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Guillaume LHERMET<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2024, april 2nd<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Nuclear power security, Waste heat recovery, Organic Rankine Cycle<\/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 : Ce travail s\u2019inscrit dans le cadre de la mise au point de syst\u00e8mes passifs dans l\u2019architecture de syst\u00e8mes de sauvegarde de r\u00e9acteurs \u00e0 eau pressuris\u00e9s (REP) avanc\u00e9s.Lors de l\u2019arr\u00eat de la r\u00e9action nucl\u00e9aire au sein du c\u0153ur du r\u00e9acteur, les produits de fission pr\u00e9sents dans le c\u0153ur continuent de produire de la chaleur : il s\u2019agit de la puissance r\u00e9siduelle du c\u0153ur du r\u00e9acteur. Une solution pour \u00e9vacuer cette puissance consiste \u00e0 venir utiliser une grande quantit\u00e9 d\u2019eau plac\u00e9e en hauteur, qui par convection naturelle, va permettre d\u2019\u00e9vacuer cette chaleur r\u00e9siduelle : on parle de condenseurs passifs de s\u00fbret\u00e9. On dispose ainsi de volumes d\u2019eau tr\u00e8s importants qui s\u2019\u00e9chauffent jusqu\u2019\u00e0 \u00e9bullition et pendant une dur\u00e9e relativement longue.L\u2019id\u00e9e motrice est donc d\u2019utiliser une partie de l\u2019\u00e9nergie stock\u00e9e dans ce volume d\u2019eau bouillante pour servir de source chaude \u00e0 un cycle thermodynamique au travers d\u2019un \u00e9changeur de chaleur immerg\u00e9. La puissance produite par le cycle permettra d\u2019alimenter en \u00e9lectricit\u00e9 et de fa\u00e7on autonome divers organes utiles au fonctionnement, en compl\u00e9ment de moyens existants.Cette probl\u00e9matique rejoint un enjeu majeur de l\u2019efficacit\u00e9 \u00e9nerg\u00e9tique : celui de la valorisation de la chaleur fatale industrielle ou renouvelable (biomasse, solaire, g\u00e9othermale) \u00e0 faible et moyenne temp\u00e9rature (<150\u2218C) en \u00e9lectricit\u00e9. Une solution possible pour exploiter cette chaleur est l\u2019utilisation d\u2019un cycle de Rankine \u00e0 fluide organique (ORC), syst\u00e8me mis en \u0153uvre tant \u00e0 l\u2019\u00e9chelle du laboratoire qu\u2019\u00e0 l\u2019\u00e9chelle industrielle depuis une dizaine d\u2019ann\u00e9es.Deux singularit\u00e9s li\u00e9es au contexte de ce travail r\u00e9sident dans la nature de la source chaude et dans l\u2019exigence de fiabilit\u00e9 et de robustesse de ce syst\u00e8me ; ces deux difficult\u00e9s majeures s\u2019ajoutent aux contraintes habituellement demand\u00e9es \u00e0 ce type de cycle : maximisation de la performance \u00e9nerg\u00e9tique, respect de l\u2019environnement et minimisation de l\u2019encombrement.L'objectif de la th\u00e8se a \u00e9t\u00e9 d'\u00e9tudier le comportement de ce syst\u00e8me complexe bas\u00e9 sur un cycle ORC, par une approche associant la mod\u00e9lisation et de l'exp\u00e9rimentation, et ainsi d'apporter une contribution \u00e0 la d\u00e9monstration de fiabilit\u00e9 de la solution retenue. De fa\u00e7on plus pr\u00e9cise, un mod\u00e8le th\u00e9orique a permis de dimensionner un banc d\u2019essais exp\u00e9rimental repr\u00e9sentant le couplage entre un ORC et une cuve d\u2019eau bouillante. Ainsi a \u00e9t\u00e9 \u00e9tudi\u00e9e exp\u00e9rimentalement le fonctionnement satisfaisant du cycle ainsi que son adaptabilit\u00e9 \u00e0 certaines conditions hors nominales telles que l\u2019augmentation de la temp\u00e9rature de source froide, la pr\u00e9sence de gouttelettes de liquide en entr\u00e9e de la turbine ou encore les cons\u00e9quences d\u2019une variation de la quantit\u00e9 de fluide de travail dans le circuit ORC. L\u2019ensemble de ces crit\u00e8res off-design ont d\u00e9montr\u00e9 une fiabilit\u00e9 int\u00e9ressante des ORC dans la gamme \u00e9tudi\u00e9e et ce, pour plusieurs fluides de travail (NOVEC649, HFE7100). Des \u00e9tudes d\u2019architecture propres au couplage ORC et cuve d\u2019eau ont aussi \u00e9t\u00e9 men\u00e9es, notamment sur la position de l\u2019\u00e9vaporateur immerg\u00e9 dans la cuve et sur la variation de puissance impos\u00e9e.L\u2019ensemble de ces r\u00e9sultats exp\u00e9rimentaux ont permis de valider les mod\u00e8les th\u00e9oriques et les simulations num\u00e9riques r\u00e9alis\u00e9es avec le logiciel EES. Ces mod\u00e8les, ont enfin permis de r\u00e9aliser un dimensionnement \u00e0 l\u2019\u00e9chelle industrielle de l\u2019ORC ainsi que de proposer des recommandations. Celles-ci portent notamment sur le choix du fluide de travail au travers d\u2019une analyse multicrit\u00e8re et sur l\u2019architecture du couplage ORC et piscine condenseur.\n<\/p>","protected":false},"author":1,"featured_media":959,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6481,6844,6846,6842,6843,6845],"class_list":["post-21040","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-cycle-organique-de-rankine","tag-nuclear-power-security","tag-organic-rankine-cycle","tag-surete-nucleaire","tag-valorisation-de-la-chaleur-fatale","tag-waste-heat-recovery"],"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>Etude d\u2019un cycle organique de Rankine coupl\u00e9 \u00e0 un syst\u00e8me passif innovant : application aux r\u00e9acteurs nucl\u00e9aires avanc\u00e9s - 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\/etude-dun-cycle-organique-de-rankine-couple-a-un-systeme-passif-innovant-application-aux-reacteurs-nucleaires-avances\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Etude d\u2019un cycle organique de Rankine coupl\u00e9 \u00e0 un syst\u00e8me passif innovant : application aux r\u00e9acteurs nucl\u00e9aires avanc\u00e9s\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Ce travail s\u2019inscrit dans le cadre de la mise au point de syst\u00e8mes passifs dans l\u2019architecture de syst\u00e8mes de sauvegarde de r\u00e9acteurs \u00e0 eau pressuris\u00e9s (REP) avanc\u00e9s.Lors de l\u2019arr\u00eat de la r\u00e9action nucl\u00e9aire au sein du c\u0153ur du r\u00e9acteur, les produits de fission pr\u00e9sents dans le c\u0153ur continuent de produire de la chaleur : il s\u2019agit de la puissance r\u00e9siduelle du c\u0153ur du r\u00e9acteur. Une solution pour \u00e9vacuer cette puissance consiste \u00e0 venir utiliser une grande quantit\u00e9 d\u2019eau plac\u00e9e en hauteur, qui par convection naturelle, va permettre d\u2019\u00e9vacuer cette chaleur r\u00e9siduelle : on parle de condenseurs passifs de s\u00fbret\u00e9. On dispose ainsi de volumes d\u2019eau tr\u00e8s importants qui s\u2019\u00e9chauffent jusqu\u2019\u00e0 \u00e9bullition et pendant une dur\u00e9e relativement longue.L\u2019id\u00e9e motrice est donc d\u2019utiliser une partie de l\u2019\u00e9nergie stock\u00e9e dans ce volume d\u2019eau bouillante pour servir de source chaude \u00e0 un cycle thermodynamique au travers d\u2019un \u00e9changeur de chaleur immerg\u00e9. La puissance produite par le cycle permettra d\u2019alimenter en \u00e9lectricit\u00e9 et de fa\u00e7on autonome divers organes utiles au fonctionnement, en compl\u00e9ment de moyens existants.Cette probl\u00e9matique rejoint un enjeu majeur de l\u2019efficacit\u00e9 \u00e9nerg\u00e9tique : celui de la valorisation de la chaleur fatale industrielle ou renouvelable (biomasse, solaire, g\u00e9othermale) \u00e0 faible et moyenne temp\u00e9rature (\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/etude-dun-cycle-organique-de-rankine-couple-a-un-systeme-passif-innovant-application-aux-reacteurs-nucleaires-avances\/\" \/>\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=\"2024-08-19T08:05:52+00:00\" \/>\n<meta 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