{"id":45135,"date":"2019-10-17T15:07:58","date_gmt":"2019-10-17T14:07:58","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/exemple-defficacite-de-carnot-probleme-de-solution-definition\/"},"modified":"2020-02-20T20:51:04","modified_gmt":"2020-02-20T19:51:04","slug":"exemple-defficacite-de-carnot-probleme-de-solution-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/exemple-defficacite-de-carnot-probleme-de-solution-definition\/","title":{"rendered":"Exemple d\u2019efficacit\u00e9 de Carnot &#8211; Probl\u00e8me de solution &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Exemple d&#8217;efficacit\u00e9 de Carnot &#8211; Probl\u00e8me de solution.\u00a0Calculez l&#8217;efficacit\u00e9 de Carnot d&#8217;une centrale au charbon.\u00a0Comparez-le avec les cycles r\u00e9els des centrales.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Cycle Carnot &#8211; Proc\u00e9d\u00e9s<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Carnot-cycle-Processes-min.png\"><img loading=\"lazy\" class=\"alignright wp-image-17529 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Carnot-cycle-Processes-min.png\" alt=\"Cycle Carnot - Proc\u00e9d\u00e9s\" width=\"370\" height=\"544\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Carnot-cycle-Processes-min.png\" \/><\/a>Dans un\u00a0<strong>cycle Carnot<\/strong>\u00a0, le syst\u00e8me qui ex\u00e9cute le cycle subit une s\u00e9rie de\u00a0<strong>quatre processus r\u00e9versibles de mani\u00e8re interne<\/strong>\u00a0:\u00a0<strong>deux\u00a0<a title=\"Processus isentropique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-processus-isentropique-definition\/\">processus isentropiques<\/a><\/strong>\u00a0(adiabatique r\u00e9versible) altern\u00e9s avec\u00a0<strong>deux\u00a0<\/strong><a title=\"Processus isothermique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-processus-isothermique-definition\/\"><strong>processus isothermiques<\/strong><\/a>\u00a0:<\/p>\n<ol>\n<li><strong>compression isentropique<\/strong>\u00a0&#8211; Le gaz est comprim\u00e9 de\u00a0mani\u00e8re adiabatique de l&#8217;\u00a0\u00e9tat 1 \u00e0 l&#8217;\u00a0\u00e9tat 2, o\u00f9 la temp\u00e9rature est\u00a0<strong>T\u00a0<sub>H<\/sub><\/strong>\u00a0.\u00a0Les environs travaillent sur le gaz, augmentant son \u00e9nergie interne et le comprimant.\u00a0Par contre, l&#8217;\u00a0<strong>entropie<\/strong>\u00a0reste\u00a0<strong>inchang\u00e9e<\/strong>\u00a0.<\/li>\n<li><strong>D\u00e9tente isotherme<\/strong>\u00a0&#8211; Le syst\u00e8me est plac\u00e9 en contact avec le r\u00e9servoir \u00e0\u00a0<strong>T\u00a0<sub>H<\/sub><\/strong>\u00a0.\u00a0Le gaz se dilate de mani\u00e8re isothermique tout en recevant de l&#8217;\u00e9nergie Q\u00a0<sub>H<\/sub>\u00a0du r\u00e9servoir chaud par transfert de chaleur.\u00a0La temp\u00e9rature du gaz ne change pas pendant le processus.\u00a0Le gaz fonctionne sur les environs.\u00a0Le changement d&#8217;entropie total est donn\u00e9 par:\u00a0<strong><em>S = S\u00a0<\/em><\/strong><strong><em><sub>1<\/sub><\/em><\/strong><strong><em>\u00a0&#8211; S\u00a0<\/em><\/strong><strong><em><sub>4<\/sub><\/em><\/strong><strong><em>\u00a0= Q\u00a0<\/em><\/strong><strong><em><sub>H<\/sub><\/em><\/strong><strong><em>\u00a0\/ T\u00a0<\/em><\/strong><strong><em><sub>H<\/sub><\/em><\/strong><\/li>\n<li><strong>d\u00e9tente isentropique<\/strong>\u00a0&#8211; le gaz se\u00a0d\u00e9tend adiabatiquement de l&#8217;\u00a0\u00e9tat 3 \u00e0 l&#8217;\u00a0\u00e9tat 4, o\u00f9 la temp\u00e9rature est\u00a0<strong>T\u00a0<sub>C<\/sub><\/strong>\u00a0.\u00a0Le gaz travaille sur l&#8217;environnement et perd une quantit\u00e9 d&#8217;\u00e9nergie interne \u00e9gale au travail qui quitte le syst\u00e8me.\u00a0Encore une fois, l&#8217;entropie reste inchang\u00e9e.<\/li>\n<li><strong>compression isotherme<\/strong>\u00a0&#8211; Le syst\u00e8me est plac\u00e9 en contact avec le r\u00e9servoir \u00e0\u00a0<strong>T\u00a0<sub>C<\/sub><\/strong>\u00a0.\u00a0Le gaz se compresse isothermiquement \u00e0 son \u00e9tat initial tout en rejetant de l&#8217;\u00e9nergie Q\u00a0<sub>C<\/sub>\u00a0dans le r\u00e9servoir froid par transfert de chaleur.\u00a0Dans ce processus, les environnements fonctionnent sur le gaz.\u00a0Le changement d&#8217;entropie total est donn\u00e9 par:\u00a0<strong><em>S = S\u00a0<\/em><\/strong><strong><em><sub>3<\/sub><\/em><\/strong><strong><em>\u00a0&#8211; S\u00a0<\/em><\/strong><strong><em><sub>2<\/sub><\/em><\/strong><strong><em>\u00a0= Q\u00a0<\/em><\/strong><strong><em><sub>C<\/sub><\/em><\/strong><strong><em>\u00a0\/ T\u00a0<\/em><\/strong><strong><em><sub>C<\/sub><\/em><\/strong><\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Efficacit\u00e9 du cycle Carnot<\/h2>\n<p>En g\u00e9n\u00e9ral, le\u00a0<a title=\"Efficacit\u00e9 thermique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lefficacite-thermique-definition\/\"><strong>rendement thermique<\/strong><\/a>\u00a0,\u00a0<strong><em>\u03b7\u00a0<\/em><\/strong><strong><em><sub>e<\/sub><\/em><\/strong>\u00a0, d&#8217;un moteur thermique est d\u00e9finie comme \u00e9tant le rapport du filet\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-travail-en-thermodynamique-definition\/\">travail<\/a>\u00a0qu&#8217;il fait,\u00a0<strong>W<\/strong>\u00a0, \u00e0 la\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-chaleur-en-physique-chaleur-definition\/\">chaleur<\/a>\u00a0d&#8217; entr\u00e9e \u00e0 la temp\u00e9rature \u00e9lev\u00e9e, Q\u00a0<sub>H<\/sub>\u00a0.<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-efficiency-formula-1.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-16945 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-efficiency-formula-1.png\" alt=\"formule d'efficacit\u00e9 thermique - 1\" width=\"125\" height=\"82\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-efficiency-formula-1.png\" \/><\/a><\/p>\n<p>Etant donn\u00e9 que l&#8217;\u00a0\u00e9nergie est conserv\u00e9e en\u00a0fonction de la\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-premiere-loi-de-la-thermodynamique-definition\/\"><strong>premi\u00e8re loi de la\u00a0thermodynamique<\/strong><\/a>et de l&#8217;\u00a0\u00e9nergie ne peut pas \u00eatre converties pour fonctionner compl\u00e8tement, l&#8217;apport de chaleur, Q\u00a0<sub>H<\/sub>\u00a0, doit \u00eatre \u00e9gal au travail effectu\u00e9, W, ainsi que\u00a0la chaleur qui doit \u00eatre dissip\u00e9e sous forme de\u00a0<strong>chaleur perdue Q\u00a0<\/strong><strong><sub>C<\/sub><\/strong>\u00a0dans le environnement.\u00a0Par cons\u00e9quent, nous pouvons r\u00e9\u00e9crire la formule pour l&#8217;efficacit\u00e9 thermique comme suit:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-efficiency-formula-2.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-16944 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-efficiency-formula-2.png\" alt=\"formule d'efficacit\u00e9 thermique - 2\" width=\"352\" height=\"83\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-efficiency-formula-2.png\" \/><\/a><\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<p><span>Puisque\u00a0<\/span><strong><em><span>Q\u00a0<\/span><\/em><\/strong><strong><em><sub><span>C<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= \u2206ST\u00a0<\/span><\/em><\/strong><strong><em><sub><span>C<\/span><\/sub><\/em><\/strong>\u00a0<em><span>et\u00a0<\/span><strong><span>Q\u00a0<\/span><\/strong><\/em><strong><em><sub><span>H<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= \u2206ST\u00a0<\/span><\/em><\/strong><strong><em><sub><span>H<\/span><\/sub><\/em><\/strong><span>\u00a0, la formule de cette efficacit\u00e9 maximale est:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/carnot-efficiency-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-16897 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/carnot-efficiency-equation.png\" alt=\"Formule d'efficacit\u00e9 Carnot\" width=\"369\" height=\"91\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/carnot-efficiency-equation.png\" \/><\/a><\/p>\n<p><span>o\u00f9:<\/span><\/p>\n<ul>\n<li><span>est l&#8217;efficacit\u00e9 du cycle de Carnot, c&#8217;est-\u00e0-dire le rapport\u00a0<\/span><strong><span>= W \/ Q\u00a0<\/span><\/strong><strong><sub><span>H<\/span><\/sub><\/strong><span>\u00a0du travail effectu\u00e9 par le moteur sur l&#8217;\u00e9nergie thermique entrant dans le syst\u00e8me depuis le r\u00e9servoir chaud.<\/span><\/li>\n<li><strong><span>T\u00a0<\/span><\/strong><strong><sub><span>C<\/span><\/sub><\/strong><span>\u00a0est la temp\u00e9rature absolue (Kelvins) du r\u00e9servoir froid,<\/span><\/li>\n<li><strong><span>T\u00a0<\/span><\/strong><strong><sub><span>H<\/span><\/sub><\/strong><span>\u00a0est la temp\u00e9rature absolue (Kelvins) du r\u00e9servoir chaud.<\/span><\/li>\n<\/ul>\n<p><span>Voir aussi:\u00a0<\/span><a title=\"Causes d'inefficacit\u00e9 - Efficacit\u00e9 thermique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/thermal-efficiency\/causes-of-inefficiency\/\"><span>Causes des inefficacit\u00e9s<\/span><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Exemple: efficacit\u00e9 de Carnot pour une centrale au charbon<\/span><\/h2>\n<p><span>Dans une\u00a0<\/span><strong><span>centrale \u00e9lectrique au charbon<\/span><\/strong><span>\u00a0moderne\u00a0, la temp\u00e9rature de la\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/supercritical-fluid-supercritical-water\/what-is-supercritical-steam\/\"><strong><span>vapeur \u00e0 haute pression<\/span><\/strong><\/a><span>\u00a0(T\u00a0<\/span><sub><span>chaud<\/span><\/sub><span>\u00a0) serait d&#8217;environ 400 \u00b0 C (673 K) et T\u00a0<\/span><sub><span>froide<\/span><\/sub><span>\u00a0, la temp\u00e9rature de l&#8217;eau de la tour de refroidissement, serait d&#8217;environ 20 \u00b0 C (293 K).\u00a0Pour ce type de centrale, l&#8217;efficacit\u00e9 maximale (id\u00e9ale) sera:<\/span><\/p>\n<p><strong><em><span>\u03b7\u00a0<\/span><\/em><\/strong><strong><em><sub><span>th<\/span><\/sub><\/em><\/strong><span>\u00a0= 1 &#8211; T<\/span><sub><span>\u00a0froid<\/span><\/sub><span>\u00a0\/ T<\/span><sub><span>\u00a0chaud<\/span><\/sub><span>\u00a0= 1 &#8211; 293\/673 =<\/span><strong><span>\u00a056%<\/span><\/strong><\/p>\n<p><span>Il faut l&#8217;ajouter, c&#8217;est une\u00a0<\/span><strong><span>efficacit\u00e9 id\u00e9alis\u00e9e<\/span><\/strong><span>\u00a0.\u00a0L&#8217;efficacit\u00e9 Carnot est valable pour les proc\u00e9d\u00e9s r\u00e9versibles.\u00a0Ces processus ne peuvent pas \u00eatre r\u00e9alis\u00e9s dans les cycles r\u00e9els des centrales \u00e9lectriques.\u00a0L&#8217;efficacit\u00e9 Carnot dicte que des rendements plus \u00e9lev\u00e9s peuvent \u00eatre atteints en augmentant la temp\u00e9rature de la vapeur.\u00a0Cette fonctionnalit\u00e9 est \u00e9galement valable pour les cycles thermodynamiques r\u00e9els.\u00a0Mais cela n\u00e9cessite une augmentation des pressions \u00e0 l&#8217;int\u00e9rieur des chaudi\u00e8res ou\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\"><span>des g\u00e9n\u00e9rateurs de vapeur<\/span><\/a><span>\u00a0.\u00a0Cependant, des consid\u00e9rations m\u00e9tallurgiques\u00a0<\/span><strong><span>imposent des limites sup\u00e9rieures<\/span><\/strong><span>\u00a0\u00e0 ces pressions.\u00a0Les centrales \u00e9lectriques \u00e0 combustibles fossiles sous-critiques, qui fonctionnent sous\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/critical-pressure-of-water\/\"><strong><span>une pression critique<\/span><\/strong><\/a><span>\u00a0(c&#8217;est-\u00e0-dire inf\u00e9rieure \u00e0 22,1 MPa), peuvent atteindre une efficacit\u00e9 de 36 \u00e0 40%.\u00a0Conceptions supercritiques, qui fonctionnent \u00e0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/supercritical-fluid-supercritical-water\/what-is-supercritical-steam\/\"><strong><span>pression supercritique<\/span><\/strong><\/a><span>(c&#8217;est-\u00e0-dire sup\u00e9rieure \u00e0 22,1 MPa), ont des rendements d&#8217;environ 43%.\u00a0Les centrales au charbon les plus efficaces et les plus complexes qui fonctionnent \u00e0\u00a0<\/span><strong><span>des pressions \u00abultra critiques\u00bb<\/span><\/strong><span>\u00a0(soit environ 30 MPa) et utilisent un r\u00e9chauffage \u00e0 plusieurs \u00e9tages atteignent une efficacit\u00e9 d&#8217;environ 48%.<\/span><\/p>\n<p><span>Voir aussi:\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/reactor-types\/supercritical-water-reactor-scwr\/\"><span>R\u00e9acteur supercritique<\/span><\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exemple d&#8217;efficacit\u00e9 de Carnot &#8211; Probl\u00e8me de solution.\u00a0Calculez l&#8217;efficacit\u00e9 de Carnot d&#8217;une centrale au charbon.\u00a0Comparez-le avec les cycles r\u00e9els des centrales.\u00a0G\u00e9nie thermique Cycle Carnot &#8211; Proc\u00e9d\u00e9s Dans un\u00a0cycle Carnot\u00a0, le syst\u00e8me qui ex\u00e9cute le cycle subit une s\u00e9rie de\u00a0quatre processus r\u00e9versibles de mani\u00e8re interne\u00a0:\u00a0deux\u00a0processus isentropiques\u00a0(adiabatique r\u00e9versible) altern\u00e9s avec\u00a0deux\u00a0processus isothermiques\u00a0: compression isentropique\u00a0&#8211; Le gaz est comprim\u00e9 &#8230; <a title=\"Exemple d\u2019efficacit\u00e9 de Carnot &#8211; Probl\u00e8me de solution &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/exemple-defficacite-de-carnot-probleme-de-solution-definition\/\" aria-label=\"En savoir plus sur Exemple d\u2019efficacit\u00e9 de Carnot &#8211; Probl\u00e8me de solution &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Exemple d\u2019efficacit\u00e9 de Carnot - Probl\u00e8me de solution - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Exemple d&#039;efficacit\u00e9 de Carnot - Probl\u00e8me de solution. 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