{"id":19031,"date":"2023-11-13T19:50:29","date_gmt":"2023-11-13T18:50:29","guid":{"rendered":"https:\/\/greth.fr\/?p=19031"},"modified":"2023-11-27T17:41:37","modified_gmt":"2023-11-27T16:41:37","slug":"developpement-dun-desorbeur-a-film-tombant-combinant-la-generation-et-la-purification-de-vapeur-pour-une-machine-a-absorption-ammoniac-eau-modelisation-et-experiences","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/developpement-dun-desorbeur-a-film-tombant-combinant-la-generation-et-la-purification-de-vapeur-pour-une-machine-a-absorption-ammoniac-eau-modelisation-et-experiences\/","title":{"rendered":"Development of a falling-film desorber combining vapor generation and purification for ammonia-water absorption chiller (Modeling and Experiments)"},"content":{"rendered":"<p><strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">The need to meet the growing demand for cold production, as well as to favor the use of fatal heat as a source of energy are among the main challenges of the energy transition. Absorption machines can be used to address these two problems, by producing cold for the industry or air-conditioning of buildings, by recovering heat, coming from abundant and low costs sources such as the sun and the heat networks. Among the existing working-pair, ammonia water has interesting physical properties, in addition to having a very low environmental impact. One of the constraints for better performance of a NH3-H2O absorption machine is the purity of the ammonia vapor generated, which must be high. However, the small volatility gap between ammonia and water induces the presence of traces of water in ammonia vapor.The work carried out in this thesis presents the development of a new combined generator, combining the generation and the rectification of ammonia vapor in a falling-film and plate exchanger, and the impact of its implementation on the performances of a small capacity NH3-H2O absorption chiller designed for refreshment.First of all, a numerical model is developed, allowing simulating the desorption and absorption processes, as well as the coupled heat and mass transfer operating within the falling-film, in co-current or counter-current configuration. Adiabatic plates are placed above the heated plates, allowing increasing the fraction of ammonia in the vapor generated. The impact of the input variables and the geometry of the plates is studied, in order to determine the ideal input conditions, and the most compact geometry, allowing generating the purest ammonia vapor possible at lower energy costs. Then, the combined generator, characterized by new correlations establishing its mass, thermal and species effectiveness, is implemented in a NH3-H2O absorption chiller model to study its impact on the machine's performance. The influence of the input parameters of the combined generator is analyzed. The new combined generator is then experimentally designed and implemented in a single-effect NH3-H2O absorption chiller of 5 kW cold capacity. Parametric studies are carried out on the operating conditions of the machine, (in particular through a design of experiments), which allows characterizing its operation including the new combined generator, and defining the operating limits and optimums in terms of coefficient of performance and cold production. Finally, according to the operating conditions of the absorption chiller, a comparative analysis of the combined generator performance is carried out between modeling and experiments. Two modes of operation are studied: with falling-film only, or with the third bottom flooded and seat of boiling phenomena. A boiler (formerly implemented in the machine) is also modelled and its numerical performance is compared to the measurements. The comparison of the performance and effectiveness of the three generator models showed that the combined falling-film combined generator produces purer ammonia vapor for a better cycle performance.<\/p>\n<table width=\"100%\" border=\"1\">\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Mathilde WIRTZ<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>24 f\u00e9rier 2022<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>NH3\u2013H2O absorption chiller, Combined generator, Modeling and Experiments<\/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 : La n\u00e9cessit\u00e9 de r\u00e9pondre \u00e0 la demande de production de froid croissante, ainsi que de privil\u00e9gier la valorisation de chaleur fatale comme source d&#8217;\u00e9nergie, comptent parmi les nombreux enjeux de la transition \u00e9nerg\u00e9tique. Les machines \u00e0 absorption permettent de r\u00e9pondre \u00e0 ces deux probl\u00e9matiques, en produisant du froid pour l&#8217;industrie ou la climatisation &hellip;<\/p>","protected":false},"author":1,"featured_media":961,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6679,6678,6680],"class_list":["post-19031","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-generateur-combine","tag-machine-a-absorption-nh3-h2o","tag-modelisation-et-experiences"],"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>D\u00e9veloppement d&#039;un d\u00e9sorbeur \u00e0 film tombant combinant la g\u00e9n\u00e9ration et la purification de vapeur pour une machine \u00e0 absorption ammoniac-eau (Mod\u00e9lisation et Exp\u00e9riences) - 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\/developpement-dun-desorbeur-a-film-tombant-combinant-la-generation-et-la-purification-de-vapeur-pour-une-machine-a-absorption-ammoniac-eau-modelisation-et-experiences\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9veloppement d&#039;un d\u00e9sorbeur \u00e0 film tombant combinant la g\u00e9n\u00e9ration et la purification de vapeur pour une machine \u00e0 absorption ammoniac-eau (Mod\u00e9lisation et Exp\u00e9riences)\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : La n\u00e9cessit\u00e9 de r\u00e9pondre \u00e0 la demande de production de froid croissante, ainsi que de privil\u00e9gier la valorisation de chaleur fatale comme source d&#039;\u00e9nergie, comptent parmi les nombreux enjeux de la transition \u00e9nerg\u00e9tique. Les machines \u00e0 absorption permettent de r\u00e9pondre \u00e0 ces deux probl\u00e9matiques, en produisant du froid pour l&#039;industrie ou la climatisation &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/developpement-dun-desorbeur-a-film-tombant-combinant-la-generation-et-la-purification-de-vapeur-pour-une-machine-a-absorption-ammoniac-eau-modelisation-et-experiences\/\" \/>\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=\"2023-11-13T18:50:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-27T16:41:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-5.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"424\" \/>\n\t<meta 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