{"id":48143,"date":"2019-11-08T07:25:40","date_gmt":"2019-11-08T06:25:40","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-expansao-isentropica-compressao-isentropica-definicao\/"},"modified":"2020-01-27T17:06:49","modified_gmt":"2020-01-27T16:06:49","slug":"o-que-e-expansao-isentropica-compressao-isentropica-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-expansao-isentropica-compressao-isentropica-definicao\/","title":{"rendered":"O que \u00e9 Expans\u00e3o Isentr\u00f3pica &#8211; Compress\u00e3o Isentr\u00f3pica &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Expans\u00e3o Isentr\u00f3pica &#8211; Compress\u00e3o Isentr\u00f3pica. O estudo de processos isentr\u00f3picos \u00e9 de import\u00e2ncia na termodin\u00e2mica de usinas termel\u00e9tricas. Especialmente em turbinas a g\u00e1s. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><span>Expans\u00e3o isentr\u00f3pica &#8211; compress\u00e3o isentr\u00f3pica para gases ideais<\/span><\/h2>\n<p><span>Um\u00a0<\/span><strong><span>processo isentr\u00f3pico<\/span><\/strong><span>\u00a0\u00e9 um\u00a0<\/span><a title=\"Processos termodin\u00e2micos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\"><strong><span>processo termodin\u00e2mico<\/span><\/strong><\/a><span>\u00a0, no qual a\u00a0<\/span><a title=\"O que \u00e9 entropia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/\"><strong><span>entropia<\/span><\/strong>\u00a0<\/a><span>do fluido ou g\u00e1s permanece constante.\u00a0Isso significa que o\u00a0<\/span><strong><span>processo isentr\u00f3pico<\/span><\/strong><span>\u00a0\u00e9 um caso especial de um\u00a0<\/span><strong><span>processo adiab\u00e1tico<\/span><\/strong><span>\u00a0no qual n\u00e3o h\u00e1 transfer\u00eancia de calor ou mat\u00e9ria.\u00a0\u00c9 um\u00a0<\/span><strong><span>processo adiab\u00e1tico revers\u00edvel<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<h2><span>Expans\u00e3o e compress\u00e3o de gases ideais<\/span><\/h2>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"O que \u00e9 o g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/what-is-ideal-gas\/\"><span>O que \u00e9 um g\u00e1s ideal<\/span><\/a><\/p>\n<p><span>Num\u00a0<\/span><a title=\"O que \u00e9 o g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/what-is-ideal-gas\/\"><span>g\u00e1s ideal<\/span><\/a><span>\u00a0, as mol\u00e9culas n\u00e3o t\u00eam volume e n\u00e3o interagem.\u00a0De acordo com a\u00a0<\/span><a title=\"Lei do g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/\"><span>lei ideal dos gases<\/span><\/a><span>\u00a0, a\u00a0<\/span><a title=\"O que \u00e9 press\u00e3o - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\"><span>press\u00e3o<\/span><\/a><span>\u00a0varia linearmente com a\u00a0<\/span><a title=\"O que \u00e9 temperatura - F\u00edsica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-temperatura-fisica-definicao\/\"><span>temperatura<\/span><\/a><span>\u00a0e a quantidade e inversamente com o\u00a0<\/span><a title=\"O que \u00e9 volume - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-volume-physics\/\"><span>volume<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><strong><em><span>pV = nRT<\/span><\/em><\/strong><\/p>\n<p><span>Onde:<\/span><\/p>\n<ul>\n<li><em><span>p<\/span><\/em><span>\u00a0\u00e9 a press\u00e3o absoluta do g\u00e1s<\/span><\/li>\n<li><em><span>n<\/span><\/em><span>\u00a0\u00e9 a quantidade de subst\u00e2ncia<\/span><\/li>\n<li><em><span>T<\/span><\/em><span>\u00a0\u00e9 a temperatura absoluta<\/span><\/li>\n<li><em><span>V<\/span><\/em><span>\u00a0\u00e9 o volume<\/span><\/li>\n<li><em><span>R<\/span><\/em><span>\u00a0\u00a0\u00e9 a constante de g\u00e1s ideal, ou universal, igual ao produto da constante de Boltzmann e da constante de Avogadro,<\/span><\/li>\n<\/ul>\n<p><span>Nesta equa\u00e7\u00e3o, o s\u00edmbolo R \u00e9 uma constante chamada constante\u00a0<\/span><strong><span>universal de g\u00e1s<\/span><\/strong><span>\u00a0que tem o mesmo valor para todos os gases &#8211; ou seja, R = 8,31 J \/ mol K.<\/span><\/p>\n<p><span>O\u00a0<\/span><strong><span>processo isentr\u00f3pico<\/span><\/strong><span>\u00a0(um caso especial de processo adiab\u00e1tico) pode ser expresso com a\u00a0<\/span><strong><span>lei dos gases ideais<\/span><\/strong><span>\u00a0como:<\/span><\/p>\n<p><strong><em><span>pV\u00a0<\/span><sup><span>\u03ba<\/span><\/sup><span>\u00a0= constante<\/span><\/em><\/strong><\/p>\n<p><span>ou<\/span><\/p>\n<p><em><strong><span>p\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0V\u00a0<\/span><sub><span>1\u00a0<\/span><\/sub><sup><span>k<\/span><\/sup><span>\u00a0= p\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0V\u00a0<\/span><sub><span>2\u00a0<\/span><\/sub><sup><span>k<\/span><\/sup><\/strong><\/em><\/p>\n<p><span>em que\u00a0<\/span><strong><span>\u03ba = c\u00a0<\/span><sub><span>p<\/span><\/sub><span>\u00a0\/ c\u00a0<\/span><sub><span>v<\/span><\/sub><\/strong><span>\u00a0\u00e9 a propor\u00e7\u00e3o de\u00a0<a title=\"Capacidade t\u00e9rmica - Capacidade t\u00e9rmica espec\u00edfica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/heat-capacity\/\"><strong>aquecimentos espec\u00edficos<\/strong><\/a>\u00a0(ou\u00a0<strong>capacidades de calor<\/strong>\u00a0) para o g\u00e1s.\u00a0Um para\u00a0<strong>press\u00e3o constante (c\u00a0<\/strong><strong><sub>p<\/sub><\/strong><strong>\u00a0)<\/strong>\u00a0e outro para\u00a0<strong>volume constante (c\u00a0<\/strong><strong><sub>v<\/sub><\/strong><strong>\u00a0)<\/strong>\u00a0.\u00a0Observe que essa raz\u00e3o\u00a0<strong>\u03ba\u00a0\u00a0<\/strong><strong>= c\u00a0<\/strong><strong><sub>p<\/sub><\/strong><strong>\u00a0\/ c\u00a0<\/strong><strong><sub>v<\/sub><\/strong>\u00a0\u00e9 um fator na determina\u00e7\u00e3o da velocidade do som em um g\u00e1s e em outros processos adiab\u00e1ticos.<\/span><\/p>\n<p><strong><span>Outra rela\u00e7\u00e3o p, V, T<\/span><\/strong><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pVT-relation-isentropic-process.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17281 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pVT-relation-isentropic-process.png\" alt=\"rela\u00e7\u00e3o p, V, T - processo isentr\u00f3pico\" width=\"209\" height=\"72\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pVT-relation-isentropic-process.png\" \/><\/a><\/p>\n<p><span>Em um\u00a0<\/span><strong><span>diagrama de pV<\/span><\/strong><span>\u00a0, o processo ocorre ao longo de uma linha (chamada\u00a0<\/span><strong><span>adiabat<\/span><\/strong><span>\u00a0) que possui a equa\u00e7\u00e3o\u00a0<\/span><strong><span>p = constante \/ V\u00a0<\/span><sup><span>\u03ba<\/span><\/sup><\/strong><span>\u00a0.\u00a0<\/span><strong><span>Para um g\u00e1s ideal e um processo politr\u00f3pico, o caso\u00a0<\/span><i><span>n = \u03ba\u00a0<\/span><\/i><\/strong><span><strong>corresponde a um processo isentr\u00f3pico.<\/strong><\/span><i>\u00a0\u00a0<\/i><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<figure id=\"attachment_17280\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-17280\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-Process-characteristics.png\"><img loading=\"lazy\" class=\"size-full wp-image-17280 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-Process-characteristics.png\" alt=\"Processo isentr\u00f3pico - caracter\u00edsticas\" width=\"386\" height=\"609\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-Process-characteristics.png\" \/><\/a><figcaption id=\"caption-attachment-17280\" class=\"wp-caption-text\"><span>Tabela de caracter\u00edsticas principais<\/span><\/figcaption><\/figure>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Primeira Lei da Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-primeira-lei-da-termodinamica-definicao\/\"><span>Primeira lei da termodin\u00e2mica<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\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><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"O que \u00e9 entalpia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-enthalpy\/\"><span>O que \u00e9 entalpia<\/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: Expans\u00e3o Isentr\u00f3pica na Turbina a G\u00e1s<\/span><\/h2>\n<figure id=\"attachment_17284\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17284\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-isentropic-process.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17284 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-isentropic-process-300x251.png\" alt=\"Diagrama PV - processo isentr\u00f3pico\" width=\"300\" height=\"251\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-isentropic-process-300x251.png\" \/><\/a><figcaption id=\"caption-attachment-17284\" class=\"wp-caption-text\"><span>Diagrama PV de uma expans\u00e3o isentr\u00f3pica de h\u00e9lio (3 \u2192 4) em uma turbina a g\u00e1s.<\/span><\/figcaption><\/figure>\n<p><span>Assuma uma\u00a0<\/span><strong><span>expans\u00e3o isentr\u00f3pica<\/span><\/strong><span>\u00a0de h\u00e9lio (\u00a0<\/span><strong><span>3 \u2192 4<\/span><\/strong><span>\u00a0) em uma\u00a0<\/span><strong><span>turbina a g\u00e1s<\/span><\/strong><span>\u00a0.\u00a0Como o h\u00e9lio se comporta quase como um\u00a0<\/span><a title=\"O que \u00e9 o g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/what-is-ideal-gas\/\"><span>g\u00e1s ideal<\/span><\/a><span>\u00a0, use 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>\u00a0para calcular a\u00a0<\/span><strong><span>temperatura<\/span><\/strong><span>\u00a0de\u00a0<strong>sa\u00edda<\/strong>\u00a0do g\u00e1s (\u00a0<\/span><strong><span>T\u00a0<\/span><sub><span>4, \u00e9<\/span><\/sub><\/strong><span>\u00a0).\u00a0Nessas turbinas, o est\u00e1gio de alta press\u00e3o recebe g\u00e1s (ponto 3 na figura; p\u00a0<\/span><sub><span>3<\/span><\/sub><span>\u00a0=\u00a0<\/span><strong><span>6,7 MPa<\/span><\/strong><span>\u00a0;\u00a0<\/span><strong><span>T\u00a0<\/span><sub><span>3<\/span><\/sub><span>\u00a0= 1190 K<\/span><\/strong><span>\u00a0(917 \u00b0 C)) de um trocador de calor e o esgota em outro trocador de calor, onde a press\u00e3o de sa\u00edda \u00e9 p\u00a0<\/span><sub><span>4<\/span><\/sub><span>\u00a0=\u00a0<\/span><strong><span>2,78 MPa<\/span><\/strong><span>\u00a0(ponto 4)\u00a0<\/span><strong><span>.<\/span><\/strong><\/p>\n<p><strong><span>Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><span>A temperatura de sa\u00edda do g\u00e1s, T\u00a0<\/span><sub><span>4, \u00e9<\/span><\/sub><span>\u00a0, pode ser calculada usando a rela\u00e7\u00e3o\u00a0<\/span><strong><span>p, V, T<\/span><\/strong><span>\u00a0para o processo isentr\u00f3pico (processo adiab\u00e1tico revers\u00edvel):<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pVT-relation-isentropic-process.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17281 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pVT-relation-isentropic-process.png\" alt=\"rela\u00e7\u00e3o p, V, T - processo isentr\u00f3pico\" width=\"209\" height=\"72\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pVT-relation-isentropic-process.png\" \/><\/a><\/p>\n<p><span>Nesta equa\u00e7\u00e3o, o fator para o h\u00e9lio \u00e9 igual a\u00a0<\/span><strong><span>\u03ba\u00a0<\/span><\/strong><strong><span>= c\u00a0<\/span><sub><span>p<\/span><\/sub><span>\u00a0\/ c\u00a0<\/span><sub><span>v<\/span><\/sub><span>\u00a0= 1,66<\/span><\/strong><span>\u00a0.\u00a0A partir da equa\u00e7\u00e3o anterior, segue que a temperatura de sa\u00edda do g\u00e1s,\u00a0<\/span><strong><span>T\u00a0<\/span><sub><span>4<\/span><\/sub><\/strong><span>\u00a0, \u00e9:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/isentropic-process-example.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17283 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/isentropic-process-example.png\" alt=\"processo isentr\u00f3pico - exemplo\" width=\"503\" height=\"84\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/isentropic-process-example.png\" \/><\/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: Expans\u00e3o Isentr\u00f3pica na Turbina a G\u00e1s<\/span><\/h2>\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\"><span>O ciclo ideal de Brayton consiste em quatro processos termodin\u00e2micos.\u00a0Dois processos isentr\u00f3picos e dois processos isob\u00e1ricos.<\/span><\/figcaption><\/figure>\n<p><span>Vamos assumir o\u00a0\u00a0<\/span><strong><span>ciclo de Brayton ideal<\/span><\/strong><span>\u00a0\u00a0que descreve o funcionamento de um\u00a0\u00a0<strong>motor de calor com\u00a0<\/strong><\/span><strong><span>press\u00e3o constante<\/span><\/strong>\u00a0<span>\u00a0.\u00a0<strong>Os modernos<\/strong>\u00a0\u00a0motores de\u00a0<strong>turbina a g\u00e1s<\/strong>\u00a0e os motores a\u00a0\u00a0<strong>jato de respira\u00e7\u00e3o<\/strong>\u00a0\u00a0tamb\u00e9m seguem o ciclo de Brayton.<\/span><\/p>\n<p><span>O ciclo ideal de Brayton consiste em quatro processos termodin\u00e2micos.\u00a0Dois processos isentr\u00f3picos e dois processos isob\u00e1ricos.<\/span><\/p>\n<ol>\n<li><strong><span>compress\u00e3o isentr\u00f3pica<\/span><\/strong><span>\u00a0\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\u00a0<\/span><strong><span>W\u00a0<\/span><sub><span>C<\/span><\/sub><span>\u00a0\u00a0= H\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0\u00a0&#8211; H\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0.<\/span><\/strong><\/li>\n<li><strong><span>adi\u00e7\u00e3o de calor isob\u00e1rico<\/span><\/strong><span>\u00a0\u00a0&#8211; o ar comprimido passa por 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, j\u00e1 que a c\u00e2mara est\u00e1 aberta para entrar e sair.\u00a0O calor l\u00edquido adicionado \u00e9 dado por\u00a0\u00a0<\/span><strong><span>Q\u00a0<\/span><sub><span>add<\/span><\/sub><span>\u00a0\u00a0= H\u00a0<\/span><sub><span>3\u00a0<\/span><\/sub><span>\u00a0&#8211; H\u00a0<\/span><sub><span>2<\/span><\/sub><\/strong><\/li>\n<li><strong><span>expans\u00e3o isentr\u00f3pica<\/span><\/strong><span>\u00a0\u00a0&#8211; o ar aquecido e pressurizado se expande na turbina, gasta sua energia.\u00a0O trabalho realizado pela turbina \u00e9 dado por\u00a0\u00a0<\/span><strong><span>W\u00a0<\/span><sub><span>T<\/span><\/sub><span>\u00a0\u00a0= H\u00a0<\/span><sub><span>4<\/span><\/sub><span>\u00a0\u00a0&#8211; H\u00a0<\/span><sub><span>3<\/span><\/sub><\/strong><\/li>\n<li><strong><span>rejei\u00e7\u00e3o de calor isob\u00e1rica<\/span><\/strong><span>\u00a0\u00a0&#8211; o calor residual deve ser rejeitado para fechar o ciclo.\u00a0O calor l\u00edquido rejeitado \u00e9 dado por\u00a0\u00a0<\/span><strong><span>Q\u00a0<\/span><sub><span>re<\/span><\/sub><span>\u00a0\u00a0= H\u00a0<\/span><sub><span>4\u00a0<\/span><\/sub><span>\u00a0&#8211; H\u00a0<\/span><sub><span>1<\/span><\/sub><\/strong><\/li>\n<\/ol>\n<p><span>Como pode ser visto, podemos descrever e calcular (por exemplo,\u00a0<\/span><a title=\"Efici\u00eancia t\u00e9rmica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-eficiencia-termica-definicao\/\"><span>efici\u00eancia t\u00e9rmica<\/span><\/a><span>\u00a0) esses ciclos (da mesma forma para o\u00a0\u00a0<\/span><strong><span>ciclo de Rankine<\/span><\/strong><span>\u00a0) usando\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-enthalpy\/\"><span>entalpias<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Efici\u00eancia t\u00e9rmica do ciclo de Brayton\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/thermal-efficiency\/thermal-efficiency-of-brayton-cycle\/\"><span>Efici\u00eancia t\u00e9rmica do ciclo de Brayton<\/span><\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Expans\u00e3o Isentr\u00f3pica &#8211; Compress\u00e3o Isentr\u00f3pica. O estudo de processos isentr\u00f3picos \u00e9 de import\u00e2ncia na termodin\u00e2mica de usinas termel\u00e9tricas. Especialmente em turbinas a g\u00e1s. Engenharia T\u00e9rmica Expans\u00e3o isentr\u00f3pica &#8211; compress\u00e3o isentr\u00f3pica para gases ideais Um\u00a0processo isentr\u00f3pico\u00a0\u00e9 um\u00a0processo termodin\u00e2mico\u00a0, no qual a\u00a0entropia\u00a0do fluido ou g\u00e1s permanece constante.\u00a0Isso significa que o\u00a0processo isentr\u00f3pico\u00a0\u00e9 um caso especial de um\u00a0processo adiab\u00e1tico\u00a0no &#8230; <a title=\"O que \u00e9 Expans\u00e3o Isentr\u00f3pica &#8211; Compress\u00e3o Isentr\u00f3pica &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-expansao-isentropica-compressao-isentropica-definicao\/\" aria-label=\"More on O que \u00e9 Expans\u00e3o Isentr\u00f3pica &#8211; Compress\u00e3o Isentr\u00f3pica &#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 Expans\u00e3o Isentr\u00f3pica - Compress\u00e3o Isentr\u00f3pica - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Expans\u00e3o Isentr\u00f3pica - Compress\u00e3o Isentr\u00f3pica. 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