{"id":48107,"date":"2019-11-08T04:30:07","date_gmt":"2019-11-08T03:30:07","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-exemplo-de-eficiencia-de-carnot-problema-com-solucao-definicao\/"},"modified":"2020-01-27T14:11:55","modified_gmt":"2020-01-27T13:11:55","slug":"o-que-e-exemplo-de-eficiencia-de-carnot-problema-com-solucao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-exemplo-de-eficiencia-de-carnot-problema-com-solucao-definicao\/","title":{"rendered":"O que \u00e9 exemplo de efici\u00eancia de Carnot &#8211; Problema com solu\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Exemplo de efici\u00eancia de Carnot &#8211; Problema com a solu\u00e7\u00e3o.\u00a0Calcule a efici\u00eancia do carnot da usina a carv\u00e3o.\u00a0Compare com ciclos reais de usinas.\u00a0Engenharia T\u00e9rmica<\/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>Ciclo de Carnot &#8211; Processos<\/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=\"Ciclo de Carnot - Processos\" 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>Em um\u00a0<strong>ciclo de Carnot<\/strong>\u00a0, o sistema que executa o ciclo passa por uma s\u00e9rie de\u00a0<strong>quatro processos revers\u00edveis internamente<\/strong>\u00a0:\u00a0<strong>dois\u00a0<a title=\"Processo isentr\u00f3pico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isentropico-definicao\/\">processos isentr\u00f3picos<\/a><\/strong>\u00a0(adiab\u00e1ticos revers\u00edveis) alternados com\u00a0<strong>dois\u00a0<\/strong><a title=\"Processo isot\u00e9rmico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isotermico-definicao\/\"><strong>processos isot\u00e9rmicos<\/strong><\/a>\u00a0:<\/p>\n<ol>\n<li><strong>compress\u00e3o isentr\u00f3pica<\/strong>\u00a0&#8211; O g\u00e1s \u00e9 comprimido adiabaticamente a partir de um estado para o estado 2, onde a temperatura \u00e9\u00a0<strong>T\u00a0<sub>H<\/sub><\/strong>\u00a0.\u00a0Os arredores trabalham com o g\u00e1s, aumentando sua energia interna e comprimindo-a.\u00a0Por outro lado, a\u00a0<strong>entropia<\/strong>\u00a0permanece\u00a0<strong>inalterada<\/strong>\u00a0.<\/li>\n<li><strong>Expans\u00e3o isot\u00e9rmica<\/strong>\u00a0&#8211; O sistema \u00e9 colocado em contacto com o reservat\u00f3rio em\u00a0<strong>T\u00a0<sub>H<\/sub><\/strong>\u00a0.\u00a0O g\u00e1s se expande isot\u00e9rmica enquanto recebe energia Q\u00a0<sub>H<\/sub>\u00a0do reservat\u00f3rio quente por transfer\u00eancia de calor.\u00a0A temperatura do g\u00e1s n\u00e3o muda durante o processo.\u00a0O g\u00e1s funciona nos arredores.\u00a0A varia\u00e7\u00e3o total da entropia \u00e9 dada por:\u00a0<strong><em>\u2206S = 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>expans\u00e3o isentr\u00f3pica<\/strong>\u00a0&#8211; O g\u00e1s expande-se adiabaticamente de estado 3 para o estado 4, onde a temperatura \u00e9\u00a0<strong>T\u00a0<sub>C<\/sub><\/strong>\u00a0.\u00a0O g\u00e1s trabalha nos arredores e perde uma quantidade de energia interna igual ao trabalho que sai do sistema.\u00a0Novamente a entropia permanece inalterada.<\/li>\n<li><strong>compress\u00e3o isot\u00e9rmica<\/strong>\u00a0&#8211; O sistema \u00e9 colocado em contacto com o reservat\u00f3rio em\u00a0<strong>T\u00a0<sub>C<\/sub><\/strong>\u00a0.\u00a0O g\u00e1s \u00e9 comprimido isot\u00e9rmica ao seu estado inicial enquanto descarrega energia Q\u00a0<sub>C<\/sub>\u00a0para o reservat\u00f3rio frio por transfer\u00eancia de calor.\u00a0Nesse processo, o ambiente trabalha com o g\u00e1s.\u00a0A varia\u00e7\u00e3o total da entropia \u00e9 dada por:\u00a0<strong><em>\u2206S = 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>Efici\u00eancia do ciclo de Carnot<\/h2>\n<p>Em, a geral\u00a0<a title=\"Efici\u00eancia t\u00e9rmica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-eficiencia-termica-definicao\/\"><strong>efici\u00eancia t\u00e9rmica<\/strong><\/a>\u00a0,\u00a0<strong><em>\u03b7\u00a0<\/em><\/strong><strong><em><sub>th<\/sub><\/em><\/strong>\u00a0, de qualquer motor de calor \u00e9 definida como a raz\u00e3o entre o l\u00edquido\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-trabalho-em-termodinamica-definicao\/\">de trabalho<\/a>\u00a0que faz,\u00a0<strong>W<\/strong>\u00a0, para o\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-calor-na-fisica-calor-definicao\/\">calor<\/a>\u00a0de entrada a uma temperatura elevada, 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=\"f\u00f3rmula de efici\u00eancia t\u00e9rmica - 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>Como a energia \u00e9 conservada de acordo com a\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-primeira-lei-da-termodinamica-definicao\/\"><strong>primeira lei da termodin\u00e2mica<\/strong><\/a>e a energia n\u00e3o pode ser convertida para funcionar completamente, a entrada de calor, Q\u00a0<sub>H<\/sub>\u00a0, deve ser igual ao trabalho realizado, W, mais o calor que deve ser dissipado como\u00a0<strong>calor residual Q\u00a0<\/strong><strong><sub>C<\/sub><\/strong>\u00a0no meio Ambiente.\u00a0Portanto, podemos reescrever a f\u00f3rmula da efici\u00eancia t\u00e9rmica como:<\/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=\"f\u00f3rmula de efici\u00eancia t\u00e9rmica - 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>Como\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>e\u00a0<\/span><strong><span>Q\u00a0<\/span><\/strong><\/em><strong><em><sub><span>H<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= HST\u00a0<\/span><\/em><\/strong><strong><em><sub><span>H<\/span><\/sub><\/em><\/strong><span>\u00a0, a f\u00f3rmula para essa efici\u00eancia m\u00e1xima \u00e9:<\/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=\"F\u00f3rmula de Carnot Efici\u00eancia\" 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>Onde:<\/span><\/p>\n<ul>\n<li><span>\u00e9 a efici\u00eancia do ciclo de Carnot, ie \u00e9 a propor\u00e7\u00e3o\u00a0<\/span><strong><span>= W \/ Q\u00a0<\/span><\/strong><strong><sub><span>H<\/span><\/sub><\/strong><span>\u00a0do trabalho realizado pelo motor com a energia de calor que entra no sistema a partir do reservat\u00f3rio quente.<\/span><\/li>\n<li><strong><span>T\u00a0<\/span><\/strong><strong><sub><span>C<\/span><\/sub><\/strong><span>\u00a0\u00e9 a temperatura absoluta (Kelvins) do reservat\u00f3rio frio,<\/span><\/li>\n<li><strong><span>T\u00a0<\/span><\/strong><strong><sub><span>H<\/span><\/sub><\/strong><span>\u00a0\u00e9 a temperatura absoluta (Kelvin) do reservat\u00f3rio quente.<\/span><\/li>\n<\/ul>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Causas de Inefici\u00eancia - Efici\u00eancia T\u00e9rmica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/thermal-efficiency\/causes-of-inefficiency\/\"><span>Causas de inefici\u00eancias<\/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>Exemplo: efici\u00eancia de Carnot para usina a carv\u00e3o<\/span><\/h2>\n<p><span>Em uma moderna\u00a0<\/span><strong><span>usina<\/span><\/strong><span>\u00a0a\u00a0<strong>carv\u00e3o<\/strong>\u00a0, a temperatura do\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>vapor<\/span><\/strong><\/a><span>\u00a0de\u00a0<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>alta press\u00e3o<\/strong><\/a>\u00a0(T\u00a0<\/span><sub><span>quente<\/span><\/sub><span>\u00a0) seria de cerca de 400 \u00b0 C (673K) e T\u00a0<\/span><sub><span>fria<\/span><\/sub><span>\u00a0, a temperatura da \u00e1gua da torre de resfriamento, seria de cerca de 20 \u00b0 C (293K).\u00a0Para este tipo de usina, a efici\u00eancia m\u00e1xima (ideal) ser\u00e1:<\/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>\u00a0frio<\/span><\/sub><span>\u00a0\/ T<\/span><sub><span>\u00a0quente<\/span><\/sub><span>\u00a0= 1-293\/673 =<\/span><strong><span>\u00a056%<\/span><\/strong><\/p>\n<p><span>\u00c9 preciso acrescentar que essa \u00e9 uma\u00a0<\/span><strong><span>efici\u00eancia idealizada<\/span><\/strong><span>\u00a0.\u00a0A efici\u00eancia de Carnot \u00e9 v\u00e1lida para processos revers\u00edveis.\u00a0Esses processos n\u00e3o podem ser alcan\u00e7ados em ciclos reais de usinas.\u00a0A efici\u00eancia de Carnot determina que maiores efici\u00eancias podem ser alcan\u00e7adas aumentando a temperatura do vapor.\u00a0Esse recurso tamb\u00e9m \u00e9 v\u00e1lido para ciclos termodin\u00e2micos reais.\u00a0Mas isso requer um aumento nas press\u00f5es dentro de caldeiras ou\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\"><span>geradores de vapor<\/span><\/a><span>\u00a0.\u00a0No entanto, considera\u00e7\u00f5es metal\u00fargicas\u00a0<\/span><strong><span>imp\u00f5em limites superiores<\/span><\/strong><span>\u00a0a essas press\u00f5es.\u00a0As usinas subcr\u00edticas de combust\u00edveis f\u00f3sseis, que s\u00e3o operadas sob\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/critical-pressure-of-water\/\"><strong><span>press\u00e3o cr\u00edtica<\/span><\/strong><\/a><span>\u00a0(ou seja, inferiores a 22,1 MPa), podem atingir uma efici\u00eancia de 36 a 40%.\u00a0Projetos supercr\u00edticos, que s\u00e3o operados sob\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>press\u00e3o supercr\u00edtica<\/span><\/strong><\/a><span>(ou seja, superior a 22,1 MPa), t\u00eam efici\u00eancias em torno de 43%.\u00a0As usinas el\u00e9tricas a carv\u00e3o mais eficientes e tamb\u00e9m muito complexas, operadas a\u00a0<\/span><strong><span>press\u00f5es &#8220;ultra-cr\u00edticas&#8221;<\/span><\/strong><span>\u00a0(ou seja, cerca de 30 MPa) e que utilizam reaquecimento em v\u00e1rios est\u00e1gios, atingem cerca de 48% de efici\u00eancia.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/reactor-types\/supercritical-water-reactor-scwr\/\"><span>Reator supercr\u00edtico<\/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>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exemplo de efici\u00eancia de Carnot &#8211; Problema com a solu\u00e7\u00e3o.\u00a0Calcule a efici\u00eancia do carnot da usina a carv\u00e3o.\u00a0Compare com ciclos reais de usinas.\u00a0Engenharia T\u00e9rmica Ciclo de Carnot &#8211; Processos Em um\u00a0ciclo de Carnot\u00a0, o sistema que executa o ciclo passa por uma s\u00e9rie de\u00a0quatro processos revers\u00edveis internamente\u00a0:\u00a0dois\u00a0processos isentr\u00f3picos\u00a0(adiab\u00e1ticos revers\u00edveis) alternados com\u00a0dois\u00a0processos isot\u00e9rmicos\u00a0: compress\u00e3o isentr\u00f3pica\u00a0&#8211; O &#8230; <a title=\"O que \u00e9 exemplo de efici\u00eancia de Carnot &#8211; Problema com solu\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-exemplo-de-eficiencia-de-carnot-problema-com-solucao-definicao\/\" aria-label=\"More on O que \u00e9 exemplo de efici\u00eancia de Carnot &#8211; Problema com solu\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 exemplo de efici\u00eancia de Carnot - Problema com solu\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Exemplo de efici\u00eancia de Carnot - Problema com a solu\u00e7\u00e3o. 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