{"id":48095,"date":"2019-11-08T03:05:54","date_gmt":"2019-11-08T02:05:54","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-sao-ciclos-termodinamicos-definicao\/"},"modified":"2020-01-27T14:04:39","modified_gmt":"2020-01-27T13:04:39","slug":"o-que-sao-ciclos-termodinamicos-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-sao-ciclos-termodinamicos-definicao\/","title":{"rendered":"O que s\u00e3o ciclos termodin\u00e2micos &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O ciclo termodin\u00e2mico t\u00edpico consiste em uma s\u00e9rie de processos termodin\u00e2micos que transferem calor e trabalho.\u00a0Existem muitos tipos de ciclos 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>Ciclos termodin\u00e2micos<\/h2>\n<p>Em geral, a\u00a0<strong>termodin\u00e2mica<\/strong>\u00a0\u00e9 a ci\u00eancia que lida com produ\u00e7\u00e3o, armazenamento, transfer\u00eancia e convers\u00e3o de energia.\u00a0Nosso objetivo aqui ser\u00e1 introduzir a\u00a0<strong>termodin\u00e2mica como ci\u00eancia da convers\u00e3o de energia<\/strong>\u00a0.\u00a0Atualmente, o combust\u00edvel f\u00f3ssil ainda \u00e9 a fonte de energia predominante no mundo.\u00a0Mas a queima de combust\u00edveis f\u00f3sseis gera\u00a0<strong>apenas energia t\u00e9rmica<\/strong>\u00a0, portanto essas fontes de energia s\u00e3o chamadas de &#8221;\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/primary-energy-sources\/\"><strong>fontes de energia prim\u00e1ria<\/strong><\/a>\u00a0&#8220;, que devem\u00a0<strong>ser convertidas<\/strong>\u00a0em\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/secondary-energy-sources-energy-carriers\/\"><strong>fonte de energia secund\u00e1ria<\/strong><\/a>\u00a0, chamadas de\u00a0<strong>portadores de energia<\/strong>\u00a0(\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/electrical-energy\/\">energia el\u00e9trica<\/a>\u00a0etc.).\u00a0Para converter energia t\u00e9rmica em outra forma de energia, um\u00a0<strong>motor t\u00e9rmico<\/strong>\u00a0deve ser usado.<\/p>\n<p>Muitos\u00a0<strong>motores t\u00e9rmicos<\/strong>\u00a0operam de\u00a0<strong>maneira c\u00edclica<\/strong>\u00a0, adicionando energia na forma de calor em uma parte do ciclo e usando essa energia para realizar trabalhos \u00fateis em outra parte do ciclo.<\/p>\n<p>Um processo que eventualmente retorna um sistema ao seu estado inicial \u00e9 chamado de\u00a0<a title=\"Processo c\u00edclico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-ciclico-definicao\/\"><strong>processo c\u00edclico<\/strong><\/a>\u00a0.\u00a0Na conclus\u00e3o de um ciclo, todas as propriedades t\u00eam o mesmo valor que tinham no in\u00edcio.\u00a0O\u00a0<strong>ciclo termodin\u00e2mico<\/strong>\u00a0t\u00edpico\u00a0consiste em uma s\u00e9rie de\u00a0<a title=\"Processos termodin\u00e2micos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\">processos termodin\u00e2micos que<\/a>\u00a0transferem calor e trabalho, variando a press\u00e3o, a temperatura e outras vari\u00e1veis \u200b\u200bde estado, eventualmente retornando um sistema ao seu estado inicial.<\/p>\n<p>A\u00a0<a title=\"Primeira Lei da Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-primeira-lei-da-termodinamica-definicao\/\">primeira lei da termodin\u00e2mica<\/a>\u00a0determina que a entrada l\u00edquida de calor seja igual \u00e0 sa\u00edda l\u00edquida de trabalho em qualquer ciclo.<\/p>\n<p><strong><em>O aumento da energia interna de um sistema fechado \u00e9 igual ao calor fornecido ao sistema menos o trabalho realizado por ele.<\/em><\/strong><\/p>\n<p><strong>IntE\u00a0<\/strong><strong><sub>int<\/sub><\/strong><strong>\u00a0= Q &#8211; W<\/strong><\/p>\n<p>Esta \u00e9 a\u00a0<strong>Primeira Lei da Termodin\u00e2mica<\/strong>\u00a0e \u00e9 o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/\">princ\u00edpio da conserva\u00e7\u00e3o de energia<\/a>\u00a0, o que significa que a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/\">energia\u00a0<\/a><strong>n\u00e3o<\/strong>\u00a0pode\u00a0<strong>ser criada nem destru\u00edda<\/strong>\u00a0, mas transformada em v\u00e1rias formas \u00e0 medida que o fluido dentro do volume de controle est\u00e1 sendo estudado.<\/p>\n<p>\u00c9 a lei mais importante para an\u00e1lise da maioria dos sistemas e a que quantifica como\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/internal-energy-thermal-energy\/\"><strong>a energia t\u00e9rmica<\/strong><\/a>\u00a0\u00e9 transformada em outras\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/forms-of-energy\/\">formas de energia<\/a>\u00a0.<\/p>\n<p>Os ciclos termodin\u00e2micos podem ser divididos em duas classes principais:<\/p>\n<ul>\n<li><strong>Ciclos de energia.\u00a0<\/strong>Ciclos de energia s\u00e3o ciclos que convertem alguma\u00a0entrada de\u00a0<strong>calor\u00a0<\/strong><strong>em<\/strong>\u00a0uma\u00a0sa\u00edda de\u00a0<strong>trabalho mec\u00e2nico<\/strong>\u00a0.\u00a0Os ciclos termodin\u00e2micos de energia s\u00e3o a base para a opera\u00e7\u00e3o de motores t\u00e9rmicos, que executam a grande maioria dos ve\u00edculos a motor e geram a maior parte da energia el\u00e9trica do mundo.<\/li>\n<li><strong>Ciclos da bomba de calor.\u00a0<\/strong>\u00a0Ciclos de bomba de calor transfere\u00a0<strong>calor\u00a0<\/strong><strong>a partir de baixo para altas<\/strong>\u00a0temperaturas\u00a0<strong>usando trabalho mec\u00e2nico<\/strong>\u00a0de entrada.\u00a0N\u00e3o h\u00e1 diferen\u00e7a entre termodin\u00e2mica de refrigeradores e bombas de calor.\u00a0Ambos trabalham movendo o calor de um espa\u00e7o frio para um espa\u00e7o quente.<\/li>\n<\/ul>\n<ul>\n<li>\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>A seguinte classifica\u00e7\u00e3o dos\u00a0<\/span><strong><span>ciclos termodin\u00e2micos<\/span><\/strong><span>\u00a0\u00e9 feita de acordo com seus processos termodin\u00e2micos constituintes.\u00a0Na pr\u00e1tica, os ciclos termodin\u00e2micos idealizados simples s\u00e3o geralmente constitu\u00eddos por quatro processos termodin\u00e2micos.\u00a0Em geral, os seguintes processos geralmente constituem ciclos termodin\u00e2micos:<\/span><\/p>\n<ul>\n<li><a title=\"Processo Adiab\u00e1tico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-adiabatico-definicao\/\"><span>Processo adiab\u00e1tico<\/span><\/a><\/li>\n<li><a title=\"Processo isot\u00e9rmico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isotermico-definicao\/\"><span>Processo isot\u00e9rmico<\/span><\/a><\/li>\n<li><a title=\"Processo isob\u00e1rico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-isobarico-definicao\/\"><span>Processo isob\u00e1rico<\/span><\/a><\/li>\n<li><a title=\"Processo Isoc\u00f3rico - Processo Isom\u00e9trico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-isocorico-processo-isometrico-definicao\/\"><span>Processo isoc\u00f3rico<\/span><\/a><\/li>\n<\/ul>\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>Ciclo de Carnot<\/span><\/h2>\n<figure id=\"attachment_17528\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17528\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Carnot-cycle-pV-Diagram-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17528 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Carnot-cycle-pV-Diagram-min-300x211.png\" alt=\"diagrama pV do ciclo de Carnot\" width=\"300\" height=\"211\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Carnot-cycle-pV-Diagram-min-300x211.png\" \/><\/a><figcaption id=\"caption-attachment-17528\" class=\"wp-caption-text\"><span>Diagrama pV do ciclo de Carnot.\u00a0A \u00e1rea delimitada pelo caminho completo do ciclo representa o trabalho total que pode ser realizado durante um ciclo.<\/span><\/figcaption><\/figure>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo de Carnot - Motor t\u00e9rmico de Carnot\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-carnot-carnot-heat-engine-definicao\/\"><span>Ciclo de Carnot<\/span><\/a><\/p>\n<p><span>Em 1824, o engenheiro e f\u00edsico franc\u00eas\u00a0<\/span><strong><span>Nicolas L\u00e9onard Sadi Carnot<\/span><\/strong><span>\u00a0avan\u00e7ou o estudo da segunda lei, formando um princ\u00edpio (tamb\u00e9m chamado\u00a0<\/span><a title=\"Princ\u00edpio de Carnot - regra de Carnot\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/second-law-of-thermodynamics\/carnots-principle-carnots-rule\/\"><strong><span>de regra de Carnot<\/span><\/strong><\/a><span>\u00a0) que especifica limites para a\u00a0<\/span><strong><span>m\u00e1xima efici\u00eancia que qualquer motor t\u00e9rmico<\/span><\/strong><span>\u00a0pode obter.\u00a0Em suma, este princ\u00edpio afirma que a\u00a0<\/span><strong><span>efici\u00eancia de um ciclo termodin\u00e2mico<\/span><\/strong><span>\u00a0depende apenas da diferen\u00e7a entre os reservat\u00f3rios de temperatura quente e fria.<\/span><\/p>\n<p><strong><span>O princ\u00edpio de Carnot afirma:<\/span><\/strong><\/p>\n<ol>\n<li><span>Nenhum motor pode ser mais eficiente do que um motor revers\u00edvel (\u00a0<\/span><strong><span>um motor t\u00e9rmico Carnot<\/span><\/strong><span>\u00a0) operando entre os mesmos reservat\u00f3rios de alta temperatura e baixa temperatura.<\/span><\/li>\n<li><span>As efici\u00eancias de todos os motores revers\u00edveis (motores de\u00a0<\/span><strong><span>calor Carnot<\/span><\/strong><span>\u00a0) que operam entre os mesmos reservat\u00f3rios de temperatura constante s\u00e3o as mesmas, independentemente da subst\u00e2ncia de trabalho empregada ou dos detalhes da opera\u00e7\u00e3o.<\/span><\/li>\n<\/ol>\n<p><span>O ciclo desse mecanismo \u00e9 chamado de\u00a0<\/span><a title=\"Ciclo de Carnot - Motor t\u00e9rmico de Carnot\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-carnot-carnot-heat-engine-definicao\/\"><strong><span>ciclo de Carnot<\/span><\/strong><\/a><span>\u00a0.\u00a0Um sistema que passa por um\u00a0<\/span><strong><span>ciclo de Carnot<\/span><\/strong><span>\u00a0\u00e9 chamado de\u00a0<\/span><strong><span>mecanismo t\u00e9rmico de Carnot<\/span><\/strong><span>\u00a0.\u00a0N\u00e3o \u00e9 um ciclo termodin\u00e2mico real, mas \u00e9 uma constru\u00e7\u00e3o te\u00f3rica e n\u00e3o pode ser constru\u00edda na pr\u00e1tica.\u00a0Todos os processos termodin\u00e2micos reais s\u00e3o de alguma forma\u00a0<\/span><a title=\"Irreversibilidade dos processos naturais\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/irreversibility-of-natural-processes\/\"><strong><span>irrevers\u00edveis<\/span><\/strong><\/a><span>\u00a0.\u00a0Eles n\u00e3o s\u00e3o feitos\u00a0<\/span><strong><span>infinitamente devagar<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>infinitamente pequenos passos<\/span><\/strong><span>\u00a0na temperatura tamb\u00e9m s\u00e3o uma fic\u00e7\u00e3o te\u00f3rica.\u00a0Portanto, os motores t\u00e9rmicos devem ter efici\u00eancias mais baixas do que os limites de efici\u00eancia devido \u00e0 irreversibilidade inerente ao ciclo dos motores t\u00e9rmicos que utilizam.<\/span><\/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>Ciclo Otto<\/span><\/h2>\n<figure id=\"attachment_17461\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17461\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Otto-Cycle-PV-Diagram.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17461 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Otto-Cycle-PV-Diagram-300x245.png\" alt=\"Otto Cycle - Diagrama PV\" width=\"300\" height=\"245\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Otto-Cycle-PV-Diagram-300x245.png\" \/><\/a><figcaption id=\"caption-attachment-17461\" class=\"wp-caption-text\"><span>diagrama pV do ciclo Otto.\u00a0A \u00e1rea delimitada pelo caminho completo do ciclo representa o trabalho total que pode ser realizado durante um ciclo.<\/span><\/figcaption><\/figure>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo Otto - Otto Engine\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-otto-otto-engine-definicao\/\"><span>Ciclo Otto<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo de Atkinson - Atkinson Engine\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-atkinson-atkinson-engine-definicao\/\"><span>Ciclo de Atkinson<\/span><\/a><\/p>\n<p><span>O ciclo do mecanismo Otto \u00e9 chamado de\u00a0<\/span><a title=\"Ciclo Otto - Otto Engine\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-otto-otto-engine-definicao\/\"><strong><span>ciclo Otto<\/span><\/strong><\/a><span>\u00a0.\u00a0\u00c9 um dos\u00a0<\/span><strong><span>ciclos termodin\u00e2micos<\/span><\/strong><span>\u00a0mais comuns\u00a0encontrados em\u00a0<\/span><strong><span>motores de autom\u00f3veis e<\/span><\/strong><span>\u00a0descreve o funcionamento de um motor de pist\u00e3o de igni\u00e7\u00e3o comandada t\u00edpico.\u00a0Ao contr\u00e1rio do ciclo de Carnot, o ciclo Otto n\u00e3o executa processos isot\u00e9rmicos, porque estes devem ser realizados muito lentamente.\u00a0Em um ciclo Otto ideal, o sistema que executa o ciclo passa por uma s\u00e9rie de quatro processos revers\u00edveis internamente: dois processos isentr\u00f3picos (adiab\u00e1ticos revers\u00edveis) alternados com dois processos isoc\u00f3ricos.<\/span><\/p>\n<p><span>Como\u00a0<\/span><strong><span>o princ\u00edpio de Carnot<\/span><\/strong><span>\u00a0afirma que nenhum motor pode ser mais eficiente do que um motor revers\u00edvel (\u00a0<\/span><strong><span>um motor de calor Carnot<\/span><\/strong><span>\u00a0) operando entre os mesmos reservat\u00f3rios de alta e baixa temperatura, o motor Otto deve ter uma efici\u00eancia mais baixa que a efici\u00eancia de Carnot.\u00a0Um\u00a0<\/span><strong><span>motor automotivo a gasolina<\/span><\/strong><span>\u00a0t\u00edpico\u00a0opera com cerca de\u00a0<\/span><strong><span>25% a 30%<\/span><\/strong><span>\u00a0de efici\u00eancia t\u00e9rmica.\u00a0Cerca de 70-75% \u00e9 rejeitado como calor residual sem ser convertido em trabalho \u00fatil, ou seja, trabalho entregue \u00e0s rodas.<\/span><\/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>Ciclo Diesel<\/span><\/h2>\n<figure id=\"attachment_17644\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17644\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Diesel-cycle-pV-Diagram.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17644 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Diesel-cycle-pV-Diagram-300x280.png\" alt=\"Ciclo diesel - diagrama de pV\" width=\"300\" height=\"280\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Diesel-cycle-pV-Diagram-300x280.png\" \/><\/a><figcaption id=\"caption-attachment-17644\" class=\"wp-caption-text\"><span>Ciclo diesel &#8211; diagrama de pV<\/span><\/figcaption><\/figure>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo Diesel - Motor Diesel\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-diesel-motor-diesel-definicao\/\"><span>Ciclo Diesel<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo Duplo - Ciclo de Press\u00e3o Limitado\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-cycles\/dual-cycle-limited-pressure-cycle\/\"><span>Ciclo duplo<\/span><\/a><\/p>\n<p><a title=\"Ciclo Diesel - Motor Diesel\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-diesel-motor-diesel-definicao\/\"><strong><span>O ciclo diesel<\/span><\/strong><\/a><span>\u00a0\u00e9 um dos<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-cycles\/\"><strong><span>\u00a0ciclos termodin\u00e2micos<\/span><\/strong><\/a><span>\u00a0mais comunsencontrados em<\/span><strong><span>\u00a0motores de autom\u00f3veis e<\/span><\/strong><span>\u00a0descreve o funcionamento de um motor de pist\u00e3o de igni\u00e7\u00e3o por compress\u00e3o t\u00edpico.\u00a0O motor Diesel \u00e9 semelhante em opera\u00e7\u00e3o ao motor a gasolina.\u00a0A diferen\u00e7a mais importante \u00e9 que:<\/span><\/p>\n<ul>\n<li><span>N\u00e3o h\u00e1 combust\u00edvel no cilindro no in\u00edcio do curso de compress\u00e3o; portanto, uma autoigni\u00e7\u00e3o n\u00e3o ocorre nos motores a diesel.<\/span><\/li>\n<li><span>O motor diesel usa igni\u00e7\u00e3o por compress\u00e3o em vez de igni\u00e7\u00e3o por fa\u00edsca.<\/span><\/li>\n<li><span>Devido \u00e0 alta temperatura desenvolvida durante a compress\u00e3o adiab\u00e1tica, o combust\u00edvel inflama espontaneamente \u00e0 medida que \u00e9 injetado.\u00a0Portanto, n\u00e3o s\u00e3o necess\u00e1rias velas de igni\u00e7\u00e3o.<\/span><\/li>\n<li><span>Antes do in\u00edcio do curso de for\u00e7a, os injetores come\u00e7am a injetar combust\u00edvel diretamente na c\u00e2mara de combust\u00e3o e, portanto, a primeira parte do curso de for\u00e7a ocorre aproximadamente \u00e0 press\u00e3o constante.<\/span><\/li>\n<li><span>Taxas de compress\u00e3o mais altas podem ser alcan\u00e7adas em\u00a0<\/span><strong><span>motores a diesel do<\/span><\/strong><span>\u00a0que em motores Otto<\/span><\/li>\n<\/ul>\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>Ciclo de Brayton<\/span><\/h2>\n<figure id=\"attachment_17684\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17684\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/closed-Brayton-cycle-pV-Diagram-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17684 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/closed-Brayton-cycle-pV-Diagram-min-247x300.png\" alt=\"ciclo de Brayton fechado - pV Diagram\" width=\"247\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/closed-Brayton-cycle-pV-Diagram-min-247x300.png\" \/><\/a><figcaption id=\"caption-attachment-17684\" class=\"wp-caption-text\"><span>ciclo de Brayton fechado<\/span><\/figcaption><\/figure>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo de Brayton - Motor de turbina a g\u00e1s\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-brayton-motor-de-turbina-a-gas-definicao\/\"><span>Ciclo de Brayton<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo Ericsson - Teoria e Efici\u00eancia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-cycles\/ericsson-cycle-theory-and-efficiency\/\"><span>Ciclo Ericsson<\/span><\/a><\/p>\n<p><span>Em 1872, um engenheiro americano,\u00a0<\/span><strong><span>George Bailey Brayton,<\/span><\/strong><span>\u00a0avan\u00e7ou no estudo de\u00a0<\/span><a title=\"Motores t\u00e9rmicos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-heat-engine-definicao\/\"><span>motores t\u00e9rmicos,<\/span><\/a><span>\u00a0patenteando um motor de combust\u00e3o interna de press\u00e3o constante, inicialmente usando g\u00e1s vaporizado, mas posteriormente usando combust\u00edveis l\u00edquidos, como o querosene.\u00a0Este motor t\u00e9rmico \u00e9 conhecido como &#8221;\u00a0<\/span><em><strong><span>Motor Brayton&#8217;s Ready<\/span><\/strong><span>\u00a0&#8220;<\/span><\/em><span>\u00a0.\u00a0Isso significa que o\u00a0<\/span><strong><span>motor Brayton original<\/span><\/strong><span>\u00a0usava um\u00a0<\/span><strong><span>compressor de\u00a0<\/span><\/strong><strong><span>pist\u00e3o<\/span><\/strong><span>\u00a0e um\u00a0<strong>expansor de pist\u00e3o em<\/strong>\u00a0vez de uma turbina a g\u00e1s e um compressor de g\u00e1s.<\/span><\/p>\n<p><span>Hoje, os\u00a0<\/span><strong><span>modernos motores de turbina a g\u00e1s<\/span><\/strong><span>\u00a0e os\u00a0<strong>motores a\u00a0<\/strong><\/span><strong><span>jato de respira\u00e7\u00e3o<\/span><\/strong><span>\u00a0tamb\u00e9m s\u00e3o motores de calor com press\u00e3o constante; portanto, descrevemos sua termodin\u00e2mica pelo\u00a0<\/span><a title=\"Ciclo de Brayton - Motor de turbina a g\u00e1s\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-brayton-motor-de-turbina-a-gas-definicao\/\"><strong><span>ciclo de Brayton<\/span><\/strong><\/a><span>\u00a0.\u00a0Em geral, o\u00a0<\/span><strong><span>ciclo de Brayton<\/span><\/strong><span>\u00a0descreve o funcionamento de um\u00a0<\/span><strong><span>motor t\u00e9rmico de press\u00e3o constante<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>\u00c9 um dos\u00a0<\/span><a title=\"Ciclos termodin\u00e2micos\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-cycles\/\"><strong><span>ciclos termodin\u00e2micos<\/span><\/strong><\/a><span>\u00a0mais comuns\u00a0que podem ser encontrados em usinas de turbinas a g\u00e1s ou em avi\u00f5es.\u00a0Ao contr\u00e1rio do\u00a0<\/span><a title=\"Ciclo de Carnot - Motor t\u00e9rmico de Carnot\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-carnot-carnot-heat-engine-definicao\/\"><span>ciclo de Carnot<\/span><\/a><span>\u00a0, o\u00a0<\/span><strong><span>ciclo de Brayton<\/span><\/strong><span>\u00a0n\u00e3o executa\u00a0<\/span><a title=\"Processo isot\u00e9rmico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isotermico-definicao\/\"><span>processos isot\u00e9rmicos<\/span><\/a><span>\u00a0, porque estes devem ser realizados muito lentamente.\u00a0Em um\u00a0<\/span><strong><span>ciclo de Brayton ideal<\/span><\/strong><span>\u00a0, o sistema que executa o ciclo passa por uma s\u00e9rie de quatro processos: dois processos isentr\u00f3picos (adiab\u00e1ticos revers\u00edveis) alternados com dois processos isob\u00e1ricos.<\/span><\/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>Ciclo Rankine<\/span><\/h2>\n<figure id=\"attachment_17766\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17766\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-Cycle-Ts-Diagram-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17766 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-Cycle-Ts-Diagram-min-300x300.png\" alt=\"Ciclo de Rankine - Diagrama Ts\" width=\"300\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-Cycle-Ts-Diagram-min-300x300.png\" \/><\/a><figcaption id=\"caption-attachment-17766\" class=\"wp-caption-text\"><span>Ciclo de Rankine &#8211; Diagrama Ts<\/span><\/figcaption><\/figure>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Ciclo Rankine - Ciclo da turbina a vapor\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-rankine-ciclo-da-turbina-a-vapor-definicao\/\"><span>Ciclo Rankine<\/span><\/a><\/p>\n<p><span>Em 1859, um engenheiro escoc\u00eas,\u00a0<\/span><strong><span>William John Macquorn Rankine,<\/span><\/strong><span>\u00a0avan\u00e7ou no estudo de motores t\u00e9rmicos publicando o &#8221;\u00a0<\/span><em><span>Manual do motor a vapor e outros motores principais<\/span><\/em><span>\u00a0&#8220;.\u00a0Rankine desenvolveu uma teoria completa do\u00a0<\/span><strong><span>motor<\/span><\/strong><span>\u00a0a\u00a0<strong>vapor<\/strong>\u00a0e, de fato, de todos os motores t\u00e9rmicos.\u00a0Juntamente com\u00a0<\/span><strong><span>Rudolf Clausius<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>William Thomson<\/span><\/strong><span>\u00a0(Lord Kelvin), ele contribuiu para a termodin\u00e2mica, concentrando-se particularmente na primeira das tr\u00eas leis termodin\u00e2micas. O\u00a0<\/span><a title=\"Ciclo Rankine - Ciclo da turbina a vapor\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-rankine-ciclo-da-turbina-a-vapor-definicao\/\"><strong><span>ciclo Rankine<\/span><\/strong><\/a><span>\u00a0recebeu seu nome e descreve o desempenho dos\u00a0<\/span><strong><span>sistemas de turbinas a vapor<\/span><\/strong><span>\u00a0, embora o O princ\u00edpio tamb\u00e9m se aplica a motores alternativos, como locomotivas a vapor.\u00a0Em geral, o\u00a0<\/span><strong><span>ciclo de Rankine<\/span><\/strong><span>\u00e9 um ciclo termodin\u00e2mico idealizado de um motor de calor com press\u00e3o constante que converte parte do calor em trabalho mec\u00e2nico.\u00a0Nesse ciclo, o calor \u00e9 fornecido externamente a um circuito fechado, que geralmente usa \u00e1gua (na fase l\u00edquida e de vapor) como fluido de trabalho.\u00a0Em contraste com o\u00a0<\/span><a title=\"Ciclo de Brayton - Motor de turbina a g\u00e1s\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-de-brayton-motor-de-turbina-a-gas-definicao\/\"><span>ciclo de Brayton<\/span><\/a><span>\u00a0, o fluido de trabalho no\u00a0<\/span><strong><span>ciclo Rankine<\/span><\/strong><span>\u00a0\u00a0passa pela\u00a0<\/span><strong><span>mudan\u00e7a de fase<\/span><\/strong><span>\u00a0\u00a0de uma fase l\u00edquida para vapor e vice-versa.<\/span><\/p>\n<p><span>Embora muitas subst\u00e2ncias possam ser usadas como fluido de trabalho no ciclo Rankine (inorg\u00e2nico ou mesmo org\u00e2nico), a\u00a0<\/span><a title=\"Propriedades da \u00c1gua\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-of-water\/\"><strong><span>\u00e1gua<\/span><\/strong><\/a><span>\u00a0\u00e9 geralmente o fluido de escolha devido \u00e0s suas propriedades favor\u00e1veis, como sua qu\u00edmica n\u00e3o t\u00f3xica e n\u00e3o reativa, abund\u00e2ncia e baixo custo, bem como suas propriedades termodin\u00e2micas.\u00a0Por exemplo, a\u00a0<\/span><strong><span>\u00e1gua<\/span><\/strong><span>\u00a0tem o\u00a0<\/span><strong><span>calor espec\u00edfico mais alto<\/span><\/strong><span>\u00a0de qualquer subst\u00e2ncia comum &#8211; 4,19 kJ \/ kg K. Al\u00e9m disso, possui um\u00a0<\/span><a title=\"Calor latente de vaporiza\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/latent-heat-of-vaporization\/\"><strong><span>calor de vaporiza\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0muito alto\u00a0, o que a torna um\u00a0<\/span><strong><span>fluido de arrefecimento eficaz<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>m\u00e9dio<\/span><\/strong><span>\u00a0em usinas termel\u00e9tricas e outras ind\u00fastrias de energia.\u00a0No caso do ciclo Rankine, a\u00a0<\/span><a title=\"Lei do g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/\"><span>Lei do G\u00e1s Ideal<\/span><\/a><span>quase n\u00e3o pode ser usado (o vapor n\u00e3o segue pV = nRT), portanto, todos os par\u00e2metros importantes de \u00e1gua e vapor s\u00e3o tabulados nas chamadas &#8221;\u00a0<\/span><strong><a title=\"Tabelas de Vapor - Propriedades Espec\u00edficas da \u00c1gua e Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/steam-tables\/\"><span>Tabelas de vapor<\/span><\/a><\/strong><span>\u00a0&#8220;.<\/span><\/p>\n<p><span>Uma das principais\u00a0<\/span><strong><span>vantagens<\/span><\/strong><span>\u00a0do\u00a0<\/span><strong><span>ciclo Rankine<\/span><\/strong><span>\u00a0\u00e9 que o\u00a0processo de\u00a0<\/span><strong><span>compress\u00e3o<\/span><\/strong><span>\u00a0na bomba ocorre\u00a0<\/span><strong><span>em um l\u00edquido<\/span><\/strong><span>\u00a0.\u00a0Ao condensar o vapor de trabalho em um l\u00edquido (dentro de um condensador), a press\u00e3o na sa\u00edda da turbina \u00e9 reduzida e a energia requerida pela bomba de alimenta\u00e7\u00e3o consome apenas 1% a 3% da pot\u00eancia de sa\u00edda da turbina, e esses fatores contribuem para uma efici\u00eancia mais alta. o ciclo.<\/span><\/p>\n<p><span>Hoje, o\u00a0<\/span><strong><span>ciclo Rankine<\/span><\/strong><span>\u00a0\u00e9 o ciclo operacional fundamental de\u00a0<\/span><strong><span>todas as usinas termel\u00e9tricas<\/span><\/strong><span>\u00a0onde um fluido operacional \u00e9 continuamente evaporado e condensado.\u00a0\u00c9 um dos\u00a0<\/span><strong><span>ciclos termodin\u00e2micos<\/span><\/strong><span>\u00a0mais comuns\u00a0<strong>,<\/strong>\u00a0porque na maioria dos lugares do mundo a turbina \u00e9 movida a vapor.<\/span><\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ul>\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","protected":false},"excerpt":{"rendered":"<p>O ciclo termodin\u00e2mico t\u00edpico consiste em uma s\u00e9rie de processos termodin\u00e2micos que transferem calor e trabalho.\u00a0Existem muitos tipos de ciclos termodin\u00e2micos.\u00a0Engenharia T\u00e9rmica Ciclos termodin\u00e2micos Em geral, a\u00a0termodin\u00e2mica\u00a0\u00e9 a ci\u00eancia que lida com produ\u00e7\u00e3o, armazenamento, transfer\u00eancia e convers\u00e3o de energia.\u00a0Nosso objetivo aqui ser\u00e1 introduzir a\u00a0termodin\u00e2mica como ci\u00eancia da convers\u00e3o de energia\u00a0.\u00a0Atualmente, o combust\u00edvel f\u00f3ssil ainda \u00e9 &#8230; <a title=\"O que s\u00e3o ciclos termodin\u00e2micos &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-sao-ciclos-termodinamicos-definicao\/\" aria-label=\"More on O que s\u00e3o ciclos termodin\u00e2micos &#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 s\u00e3o ciclos termodin\u00e2micos - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O ciclo termodin\u00e2mico t\u00edpico consiste em uma s\u00e9rie de processos termodin\u00e2micos que transferem calor e trabalho. 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Existem muitos tipos de ciclos termodin\\u00e2micos. 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