{"id":9013,"date":"2017-04-27T15:00:35","date_gmt":"2017-04-27T13:00:35","guid":{"rendered":"http:\/\/greth.fr\/?p=9013"},"modified":"2023-02-23T16:47:45","modified_gmt":"2023-02-23T15:47:45","slug":"etude-experimentale-et-modelisation-de-la-formation-et-du-developpement-du-givre-sur-une-plaque-refroidie","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/etude-experimentale-et-modelisation-de-la-formation-et-du-developpement-du-givre-sur-une-plaque-refroidie\/","title":{"rendered":"\u00c9tude exp\u00e9rimentale et mod\u00e9lisation de la formation et du d\u00e9veloppement du givre sur une plaque refroidie"},"content":{"rendered":"<p><strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Dans un objectif de r\u00e9duction des consommations \u00e9nerg\u00e9tiques et des impacts environnementaux, la pompe \u00e0 chaleur (PAC) s'est impos\u00e9e comme une alternative aux syst\u00e8mes \u00e0 combustion fossile pour le chauffage et la production d'eau chaude sanitaire dans les secteurs r\u00e9sidentiel et tertiaire. Les industriels ne cessent de chercher \u00e0 accroitre la performance \u00e9nerg\u00e9tique des pompes \u00e0 chaleur. Toutefois, un ph\u00e9nom\u00e8ne encore mal maitris\u00e9 limite les progr\u00e8s : le givrage. En effet, dans certaines conditions de temp\u00e9rature et d'humidit\u00e9 de l'air ext\u00e9rieur, du givre peut se former sur la surface de l'\u00e9vaporateur de la PAC, provoquant ainsi une chute de performance. En France, pr\u00e8s de 98% des PAC du march\u00e9 utilisent l'air ext\u00e9rieur comme source de chaleur et sont donc expos\u00e9es \u00e0 ce ph\u00e9nom\u00e8ne. Malgr\u00e9 des logiques de d\u00e9givrage de plus en plus sophistiqu\u00e9es mises en oeuvre par les industriels, le fonctionnement cyclique givrage \/d\u00e9givrage r\u00e9duit fortement les performances des PAC.<\/p>\n<p>Pour optimiser les m\u00e9thodes de d\u00e9givrage, il est n\u00e9cessaire de comprendre en amont, les m\u00e9canismes d'apparition et de croissance du givre. Ce travail de th\u00e8se propose ainsi d'\u00e9tudier la formation et le d\u00e9veloppement du givre sur une plaque plane refroidie. Une \u00e9tude approfondie de la bibliographie a permis d'\u00e9tablir des bases de donn\u00e9es regroupant des points exp\u00e9rimentaux de l'\u00e9paisseur et de la masse volumique du givre. Des mod\u00e8les et corr\u00e9lations de formation du givre disponibles dans la litt\u00e9rature ont \u00e9t\u00e9 reproduits et appliqu\u00e9s \u00e0 ces bases de donn\u00e9es afin d'\u00e9valuer la capacit\u00e9 de pr\u00e9diction de chacun de ces mod\u00e8les. Les plus performants ont ainsi pu \u00eatre identifi\u00e9s.<br \/>\nEn parall\u00e8le, un banc d'essais a \u00e9t\u00e9 con\u00e7u pour observer la formation et la croissance du givre sur une plaque plane. L'\u00e9tude de sensibilit\u00e9 men\u00e9e sur la temp\u00e9rature de l'air, la temp\u00e9rature de la plaque froide, la vitesse de l'air et l'humidit\u00e9 relative a permis d'\u00e9valuer l'impact de ces param\u00e8tres sur la formation du givre, et plus particuli\u00e8rement sur trois de ses propri\u00e9t\u00e9s : l'\u00e9paisseur, la masse volumique et la conductivit\u00e9 thermique. L'humidit\u00e9 relative et la temp\u00e9rature de la plaque froide ont \u00e9t\u00e9 identifi\u00e9es comme les param\u00e8tres pr\u00e9pond\u00e9rants. Un des r\u00e9sultats importants de ce travail a \u00e9t\u00e9 de mettre en \u00e9vidence le r\u00f4le de la structure du givre sur ses propri\u00e9t\u00e9s (masse volumique et conductivit\u00e9). Les points exp\u00e9rimentaux obtenus sur le banc d'essais ont \u00e9t\u00e9 compar\u00e9s aux r\u00e9sultats issus des mod\u00e8les de la litt\u00e9rature. Les m\u00e9thodes de pr\u00e9diction identifi\u00e9es comme satisfaisantes dans la partie bibliographique de cette th\u00e8se ont fourni des r\u00e9sultats similaires d'un point de vue statistique. Des perspectives de travail ont \u00e9galement \u00e9t\u00e9 propos\u00e9es.\n<\/p>\n<table width=\"100%\" border=\"1\">\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Aur\u00e9lia LEONI<\/td>\n<\/tr>\n<tr>\n<td><strong>Date de publication<\/strong><\/td>\n<\/tr>\n<tr>\n<td>17 F\u00e9vrier 2017<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Givrage, \u00e9paisseur, masse volumique, conductivit\u00e9, cristaux, pompe \u00e0 chaleur, air humide<\/td>\n<\/tr>\n<\/table>\n\n&nbsp;<br \/>\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 : Dans un objectif de r\u00e9duction des consommations \u00e9nerg\u00e9tiques et des impacts environnementaux, la pompe \u00e0 chaleur (PAC) s&#8217;est impos\u00e9e comme une alternative aux syst\u00e8mes \u00e0 combustion fossile pour le chauffage et la production d&#8217;eau chaude sanitaire dans les secteurs r\u00e9sidentiel et tertiaire. Les industriels ne cessent de chercher \u00e0 accroitre la performance \u00e9nerg\u00e9tique &hellip;<\/p>","protected":false},"author":1,"featured_media":965,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[],"class_list":["post-9013","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses"],"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>\u00c9tude exp\u00e9rimentale et mod\u00e9lisation de la formation et du d\u00e9veloppement du givre sur une plaque refroidie - 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-experimentale-et-modelisation-de-la-formation-et-du-developpement-du-givre-sur-une-plaque-refroidie\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9tude exp\u00e9rimentale et mod\u00e9lisation de la formation et du d\u00e9veloppement du givre sur une plaque refroidie\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Dans un objectif de r\u00e9duction des consommations \u00e9nerg\u00e9tiques et des impacts environnementaux, la pompe \u00e0 chaleur (PAC) s&#039;est impos\u00e9e comme une alternative aux syst\u00e8mes \u00e0 combustion fossile pour le chauffage et la production d&#039;eau chaude sanitaire dans les secteurs r\u00e9sidentiel et tertiaire. 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