{"id":48264,"date":"2019-11-09T22:19:45","date_gmt":"2019-11-09T21:19:45","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-exemplo-da-primeira-lei-da-termodinamica-no-ciclo-de-brayton-definicao\/"},"modified":"2020-01-28T14:13:20","modified_gmt":"2020-01-28T13:13:20","slug":"o-que-e-exemplo-da-primeira-lei-da-termodinamica-no-ciclo-de-brayton-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-exemplo-da-primeira-lei-da-termodinamica-no-ciclo-de-brayton-definicao\/","title":{"rendered":"O que \u00e9 exemplo da primeira lei da termodin\u00e2mica no ciclo de Brayton &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O exemplo da Primeira Lei da Termodin\u00e2mica no Ciclo de Brayton mostra por que os engenheiros costumam usar a entalpia nos c\u00e1lculos dos processos termodin\u00e2micos.\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>Exemplo: Primeira Lei da Termodin\u00e2mica e Ciclo de Brayton<\/h2>\n<p>Vamos assumir o\u00a0<strong>ciclo de Brayton ideal<\/strong>\u00a0que descreve o funcionamento de um\u00a0<strong>motor de calor com\u00a0<\/strong><strong>press\u00e3o constante<\/strong>\u00a0.\u00a0<strong>Os modernos<\/strong>\u00a0motores de\u00a0<strong>turbina a g\u00e1s<\/strong>\u00a0e os motores a\u00a0<strong>jato de respira\u00e7\u00e3o<\/strong>\u00a0tamb\u00e9m seguem o ciclo de Brayton.\u00a0Esse ciclo consiste em quatro processos termodin\u00e2micos:<\/p>\n<ol>\n<li>\n<figure id=\"attachment_16843\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16843\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/first-law-example-brayton-cycle.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16843 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/first-law-example-brayton-cycle-300x244.png\" alt=\"primeira lei - exemplo - ciclo de brayton\" width=\"300\" height=\"244\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/first-law-example-brayton-cycle-300x244.png\" \/><\/a><figcaption id=\"caption-attachment-16843\" class=\"wp-caption-text\">O ciclo ideal de Brayton consiste em quatro processos termodin\u00e2micos.\u00a0Dois processos isentr\u00f3picos e dois processos isob\u00e1ricos.<\/figcaption><\/figure>\n<p><strong>compress\u00e3o isentr\u00f3pica<\/strong>\u00a0&#8211; o ar ambiente \u00e9 aspirado para o compressor, onde \u00e9 pressurizado (1 \u2192 2).\u00a0O trabalho necess\u00e1rio para o compressor \u00e9 dado por\u00a0<strong>W\u00a0<\/strong><strong><sub>C<\/sub><\/strong><strong>\u00a0= H\u00a0<\/strong><strong><sub>2<\/sub><\/strong><strong>\u00a0&#8211; H\u00a0<\/strong><strong><sub>1<\/sub><\/strong><strong>\u00a0.<\/strong><\/li>\n<li><strong>adi\u00e7\u00e3o de calor isob\u00e1rico<\/strong>\u00a0&#8211; o ar comprimido passa atrav\u00e9s de uma c\u00e2mara de combust\u00e3o, onde o combust\u00edvel \u00e9 queimado e o ar ou outro meio \u00e9 aquecido (2 \u2192 3).\u00a0\u00c9 um processo de press\u00e3o constante, pois a c\u00e2mara est\u00e1 aberta para entrar e sair.\u00a0O calor l\u00edquido adicionado \u00e9 dado por\u00a0<strong>Q\u00a0<\/strong><strong><sub>add<\/sub><\/strong><strong>\u00a0= H\u00a0<\/strong><strong><sub>3<\/sub><\/strong><strong>\u00a0&#8211; H\u00a0<\/strong><strong><sub>2<\/sub><\/strong><\/li>\n<li><strong>expans\u00e3o isentr\u00f3pica<\/strong>\u00a0&#8211; o ar aquecido e pressurizado se expande na turbina, gasta sua energia.\u00a0O trabalho realizado pela turbina \u00e9 dado por\u00a0<strong>W\u00a0<\/strong><strong><sub>T<\/sub><\/strong><strong>\u00a0= H\u00a0<\/strong><strong><sub>4<\/sub><\/strong><strong>\u00a0&#8211; H\u00a0<\/strong><strong><sub>3<\/sub><\/strong><\/li>\n<li><strong>rejei\u00e7\u00e3o de calor isob\u00e1rica<\/strong>\u00a0&#8211; o calor residual deve ser rejeitado para fechar o ciclo.\u00a0O calor l\u00edquido rejeitado \u00e9 dado por\u00a0<strong>Q\u00a0<\/strong><strong><sub>re<\/sub><\/strong><strong>\u00a0= H\u00a0<\/strong><strong><sub>4<\/sub><\/strong><strong>\u00a0&#8211; H\u00a0<\/strong><strong><sub>1<\/sub><\/strong><\/li>\n<\/ol>\n<p>Como pode ser visto, podemos descrever e calcular (por exemplo, efici\u00eancia termodin\u00e2mica) esses ciclos (da mesma forma para o\u00a0<strong>ciclo de Rankine<\/strong>\u00a0) usando\u00a0<a title=\"O que \u00e9 entalpia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-enthalpy\/\">entalpias<\/a>\u00a0.<\/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-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-content su-clearfix\">\n<p>&nbsp;<\/p>\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<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>O exemplo da Primeira Lei da Termodin\u00e2mica no Ciclo de Brayton mostra por que os engenheiros costumam usar a entalpia nos c\u00e1lculos dos processos termodin\u00e2micos.\u00a0Engenharia T\u00e9rmica Exemplo: Primeira Lei da Termodin\u00e2mica e Ciclo de Brayton Vamos assumir o\u00a0ciclo de Brayton ideal\u00a0que descreve o funcionamento de um\u00a0motor de calor com\u00a0press\u00e3o constante\u00a0.\u00a0Os modernos\u00a0motores de\u00a0turbina a g\u00e1s\u00a0e os &#8230; <a title=\"O que \u00e9 exemplo da primeira lei da termodin\u00e2mica no ciclo de Brayton &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-exemplo-da-primeira-lei-da-termodinamica-no-ciclo-de-brayton-definicao\/\" aria-label=\"More on O que \u00e9 exemplo da primeira lei da termodin\u00e2mica no ciclo de Brayton &#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 da primeira lei da termodin\u00e2mica no ciclo de Brayton - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O exemplo da Primeira Lei da Termodin\u00e2mica no Ciclo de Brayton mostra por que os engenheiros costumam usar a entalpia nos c\u00e1lculos dos processos termodin\u00e2micos. 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