{"id":27640,"date":"2026-05-19T09:30:17","date_gmt":"2026-05-19T07:30:17","guid":{"rendered":"https:\/\/greth.fr\/?p=27640"},"modified":"2026-05-19T10:01:54","modified_gmt":"2026-05-19T08:01:54","slug":"recuperation-de-chaleur-des-microturbines-a-gaz","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/recuperation-de-chaleur-des-microturbines-a-gaz\/","title":{"rendered":"Heat recovery from micro gas turbines"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary:<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Decentralised energy systems are being revolutionised by micro-combined heat and power systems (\u00b5CHP), which simultaneously provide heat and electricity with reduced emissions, thus playing a crucial role in the global energy transition. A micro gas turbine (\u00b5GT) based \u00b5CHP operates mainly on the Brayton cycle, starting with compression, followed by heat addition via a heat exchanger (recuperator) and combustion, and ending with expansion to atmospheric pressure. In this system, the recuperator increases the cycle efficiency by 10 per cent, where it accounts for about 30 per cent of the machine cost. It is therefore important to optimise the design of the recuperator, in order to achieve both a higher thermal efficiency (>85%) and a lower pressure drop (<5%).This thesis investigates MITIS patented recuperators consisting in complex wire-net microchannels and collectors, by using a computational fluid dynamics (CFD) approach. Due to the presence of distributing and collecting manifolds as well as hundreds of parallel microchannels, a complete conjugate heat transfer (CHT) analysis requires a large amount of computational power. Therefore, in this study, a novel methodology was developed, based on a reduced order model (ROM) to analyse the entire heat exchanger performance, in which the microchannels are modelled as a porous medium where a compressible gas is used as a working fluid. This approach allowed for reducing the mesh size to a considerable extent (billion cells to a few million cells). As a first step, a three-dimensional CFD analysis of conjugate heat transfer for a microchannel section was performed to calculate, using the constant integration method, the inertial and viscous coefficients of the porous medium model based on the Darcy-Forchheimer law. High-temperature variations and compressibility effects were accounted for in this analysis. Besides, a detailed investigation of the wire-net flow physics was made using a higher order Reynolds stress turbulence model to obtain the full velocity gradient tensor. This could detail the effect of anisotropic flow physics in the isotropic wire-net microchannels. Furthermore, the analysis of the turbulence production terms provided a deeper insight into flow attachment and detachment near the wire-net intersections. It was shown that shifting the critical Reynolds number to lower values using perturbators decreases the pressure losses and enhances the thermal efficiency and that there is an optimum mass flow where the thermal efficiency reaches maximum.Using the ROM approach, investigation of collectors with different microchannel configurations (s-shaped, wire-net and plane channels) showed that mass flow rate deviation decreases with an increase in microchannel resistance. The recirculation zones in the cylindrical collectors also changed the maldistribution pattern. It was also shown that there is a substantial drop in thermal effectiveness at low mass flow rates due to axial wall conduction losses and high flow maldistribution, resulting in a slow \u00b5GT start-up.Experimental tests were performed for both a single microchannel with S-shape perturbators and a micro-heat exchanger with triangular collectors. From experiments conducted under adiabatic conditions, it could be confirmed that the presence of perturbators in the microchannels shifted the onset of turbulent transition to lower Reynolds number values compared to free channels. The experimental testing of the whole recuperator showed that the collector pressure losses are around 40\u201350% of the microchannel ones. A comparison of experimental data with the numerical results obtained from the proposed hybrid methodology showed that the ROM can predict the heat exchanger performances, both in terms of thermal efficiency and of pressure drop, within the experimental uncertainty.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Joseph JOJOMON<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2024, july 24th<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>High temperature recuperators, CFD reduced model, Conjugate Heat Transfer, Microfluidics<\/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 : Les syst\u00e8mes \u00e9nerg\u00e9tiques d\u00e9centralis\u00e9s sont r\u00e9volutionn\u00e9s par les syst\u00e8mes de production combin\u00e9e de chaleur et d&#8217;\u00e9lectricit\u00e9, qui fournissent simultan\u00e9ment de la chaleur et de l&#8217;\u00e9lectricit\u00e9 avec des \u00e9missions r\u00e9duites, jouant ainsi un r\u00f4le crucial dans la transition \u00e9nerg\u00e9tique mondiale. Une micro-turbine \u00e0 gaz (\u00b5GT) fonctionne selon le cycle de Brayton qui commence par une compression, suivie d&#8217;un apport de chaleur via un \u00e9changeur thermique (r\u00e9cup\u00e9rateur) et une combustion, et se termine par une d\u00e9tente jusqu&#8217;\u00e0 l&#8217;atmosph\u00e8re. Dans ce syst\u00e8me, le r\u00e9cup\u00e9rateur augmente l&#8217;efficacit\u00e9 du cycle de 10 %, alors qu&#8217;il repr\u00e9sente environ 30 % du co\u00fbt de la machine. Il est donc important d&#8217;optimiser la conception du r\u00e9cup\u00e9rateur afin d&#8217;obtenir \u00e0 la fois un rendement thermique plus \u00e9lev\u00e9 et une perte de pression plus faible.Dans cette th\u00e8se, les r\u00e9cup\u00e9rateurs brevet\u00e9s de MITIS, constitu\u00e9s de microcanaux complexes en treillis et de collecteurs, sont \u00e9tudi\u00e9s par simulation num\u00e9rique (CFD). En raison de la complexit\u00e9 g\u00e9om\u00e9trique du syst\u00e8me (collecteurs amont et aval associ\u00e9s \u00e0 plusieurs centaines de microcanaux parall\u00e8les), une analyse compl\u00e8te des transferts thermiques coupl\u00e9s n\u00e9cessiterait une tr\u00e8s grande puissance de calcul. Ainsi, une nouvelle m\u00e9thodologie a \u00e9t\u00e9 d\u00e9velopp\u00e9e, bas\u00e9e sur un mod\u00e8le d&#8217;ordre r\u00e9duit (ROM) pour analyser l&#8217;ensemble des performances de l&#8217;\u00e9changeur, dans lequel les microcanaux sont mod\u00e9lis\u00e9s comme un milieu poreux transportant un gaz compressible.<\/p>","protected":false},"author":1,"featured_media":967,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6960,6890,6959,6961],"class_list":["post-27640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-cfd-modele-reduit","tag-microfluidique","tag-recuperateur-haute-temperature","tag-transfert-de-chaleur-conjugue"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.9 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz - 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\/recuperation-de-chaleur-des-microturbines-a-gaz\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Les syst\u00e8mes \u00e9nerg\u00e9tiques d\u00e9centralis\u00e9s sont r\u00e9volutionn\u00e9s par les syst\u00e8mes de production combin\u00e9e de chaleur et d&#039;\u00e9lectricit\u00e9, qui fournissent simultan\u00e9ment de la chaleur et de l&#039;\u00e9lectricit\u00e9 avec des \u00e9missions r\u00e9duites, jouant ainsi un r\u00f4le crucial dans la transition \u00e9nerg\u00e9tique mondiale. Une micro-turbine \u00e0 gaz (\u00b5GT) fonctionne selon le cycle de Brayton qui commence par une compression, suivie d&#039;un apport de chaleur via un \u00e9changeur thermique (r\u00e9cup\u00e9rateur) et une combustion, et se termine par une d\u00e9tente jusqu&#039;\u00e0 l&#039;atmosph\u00e8re. Dans ce syst\u00e8me, le r\u00e9cup\u00e9rateur augmente l&#039;efficacit\u00e9 du cycle de 10 %, alors qu&#039;il repr\u00e9sente environ 30 % du co\u00fbt de la machine. Il est donc important d&#039;optimiser la conception du r\u00e9cup\u00e9rateur afin d&#039;obtenir \u00e0 la fois un rendement thermique plus \u00e9lev\u00e9 et une perte de pression plus faible.Dans cette th\u00e8se, les r\u00e9cup\u00e9rateurs brevet\u00e9s de MITIS, constitu\u00e9s de microcanaux complexes en treillis et de collecteurs, sont \u00e9tudi\u00e9s par simulation num\u00e9rique (CFD). En raison de la complexit\u00e9 g\u00e9om\u00e9trique du syst\u00e8me (collecteurs amont et aval associ\u00e9s \u00e0 plusieurs centaines de microcanaux parall\u00e8les), une analyse compl\u00e8te des transferts thermiques coupl\u00e9s n\u00e9cessiterait une tr\u00e8s grande puissance de calcul. Ainsi, une nouvelle m\u00e9thodologie a \u00e9t\u00e9 d\u00e9velopp\u00e9e, bas\u00e9e sur un mod\u00e8le d&#039;ordre r\u00e9duit (ROM) pour analyser l&#039;ensemble des performances de l&#039;\u00e9changeur, dans lequel les microcanaux sont mod\u00e9lis\u00e9s comme un milieu poreux transportant un gaz compressible.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/recuperation-de-chaleur-des-microturbines-a-gaz\/\" \/>\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=\"2026-05-19T07:30:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-19T08:01:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-11.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"424\" \/>\n\t<meta property=\"og:image:height\" content=\"283\" \/>\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\\\/recuperation-de-chaleur-des-microturbines-a-gaz\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/recuperation-de-chaleur-des-microturbines-a-gaz\\\/\"},\"author\":{\"name\":\"GRETh\",\"@id\":\"https:\\\/\\\/greth.fr\\\/#\\\/schema\\\/person\\\/6e173032c4ce46c14339ff999b721f00\"},\"headline\":\"R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz\",\"datePublished\":\"2026-05-19T07:30:17+00:00\",\"dateModified\":\"2026-05-19T08:01:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/recuperation-de-chaleur-des-microturbines-a-gaz\\\/\"},\"wordCount\":933,\"publisher\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/recuperation-de-chaleur-des-microturbines-a-gaz\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/greth.fr\\\/wp-content\\\/uploads\\\/2015\\\/08\\\/theses-11.jpg\",\"keywords\":[\"CFD Mod\u00e8le r\u00e9duit\",\"Microfluidique\",\"R\u00e9cup\u00e9rateur haute temp\u00e9rature\",\"Transfert de chaleur conjugu\u00e9\"],\"articleSection\":[\"Documents\",\"M\u00e9moires de th\u00e8ses\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/greth.fr\\\/recuperation-de-chaleur-des-microturbines-a-gaz\\\/\",\"url\":\"https:\\\/\\\/greth.fr\\\/recuperation-de-chaleur-des-microturbines-a-gaz\\\/\",\"name\":\"R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz - 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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\/recuperation-de-chaleur-des-microturbines-a-gaz\/","og_locale":"en_US","og_type":"article","og_title":"R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz","og_description":"R\u00e9sum\u00e9 : Les syst\u00e8mes \u00e9nerg\u00e9tiques d\u00e9centralis\u00e9s sont r\u00e9volutionn\u00e9s par les syst\u00e8mes de production combin\u00e9e de chaleur et d'\u00e9lectricit\u00e9, qui fournissent simultan\u00e9ment de la chaleur et de l'\u00e9lectricit\u00e9 avec des \u00e9missions r\u00e9duites, jouant ainsi un r\u00f4le crucial dans la transition \u00e9nerg\u00e9tique mondiale. Une micro-turbine \u00e0 gaz (\u00b5GT) fonctionne selon le cycle de Brayton qui commence par une compression, suivie d'un apport de chaleur via un \u00e9changeur thermique (r\u00e9cup\u00e9rateur) et une combustion, et se termine par une d\u00e9tente jusqu'\u00e0 l'atmosph\u00e8re. Dans ce syst\u00e8me, le r\u00e9cup\u00e9rateur augmente l'efficacit\u00e9 du cycle de 10 %, alors qu'il repr\u00e9sente environ 30 % du co\u00fbt de la machine. Il est donc important d'optimiser la conception du r\u00e9cup\u00e9rateur afin d'obtenir \u00e0 la fois un rendement thermique plus \u00e9lev\u00e9 et une perte de pression plus faible.Dans cette th\u00e8se, les r\u00e9cup\u00e9rateurs brevet\u00e9s de MITIS, constitu\u00e9s de microcanaux complexes en treillis et de collecteurs, sont \u00e9tudi\u00e9s par simulation num\u00e9rique (CFD). En raison de la complexit\u00e9 g\u00e9om\u00e9trique du syst\u00e8me (collecteurs amont et aval associ\u00e9s \u00e0 plusieurs centaines de microcanaux parall\u00e8les), une analyse compl\u00e8te des transferts thermiques coupl\u00e9s n\u00e9cessiterait une tr\u00e8s grande puissance de calcul. Ainsi, une nouvelle m\u00e9thodologie a \u00e9t\u00e9 d\u00e9velopp\u00e9e, bas\u00e9e sur un mod\u00e8le d'ordre r\u00e9duit (ROM) pour analyser l'ensemble des performances de l'\u00e9changeur, dans lequel les microcanaux sont mod\u00e9lis\u00e9s comme un milieu poreux transportant un gaz compressible.","og_url":"https:\/\/greth.fr\/en\/recuperation-de-chaleur-des-microturbines-a-gaz\/","og_site_name":"GRETh","article_publisher":"https:\/\/www.facebook.com\/grethfr\/","article_author":"https:\/\/www.facebook.com\/grethfr\/","article_published_time":"2026-05-19T07:30:17+00:00","article_modified_time":"2026-05-19T08:01:54+00:00","og_image":[{"width":424,"height":283,"url":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-11.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\/recuperation-de-chaleur-des-microturbines-a-gaz\/#article","isPartOf":{"@id":"https:\/\/greth.fr\/recuperation-de-chaleur-des-microturbines-a-gaz\/"},"author":{"name":"GRETh","@id":"https:\/\/greth.fr\/#\/schema\/person\/6e173032c4ce46c14339ff999b721f00"},"headline":"R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz","datePublished":"2026-05-19T07:30:17+00:00","dateModified":"2026-05-19T08:01:54+00:00","mainEntityOfPage":{"@id":"https:\/\/greth.fr\/recuperation-de-chaleur-des-microturbines-a-gaz\/"},"wordCount":933,"publisher":{"@id":"https:\/\/greth.fr\/#organization"},"image":{"@id":"https:\/\/greth.fr\/recuperation-de-chaleur-des-microturbines-a-gaz\/#primaryimage"},"thumbnailUrl":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-11.jpg","keywords":["CFD Mod\u00e8le r\u00e9duit","Microfluidique","R\u00e9cup\u00e9rateur haute temp\u00e9rature","Transfert de chaleur conjugu\u00e9"],"articleSection":["Documents","M\u00e9moires de th\u00e8ses"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/greth.fr\/recuperation-de-chaleur-des-microturbines-a-gaz\/","url":"https:\/\/greth.fr\/recuperation-de-chaleur-des-microturbines-a-gaz\/","name":"R\u00e9cup\u00e9ration de chaleur des microturbines \u00e0 gaz - 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