{"id":47887,"date":"2019-11-07T04:08:26","date_gmt":"2019-11-07T03:08:26","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-exemplo-de-ciclo-de-rankine-problema-com-solucao-definicao\/"},"modified":"2020-01-25T09:57:33","modified_gmt":"2020-01-25T08:57:33","slug":"o-que-e-exemplo-de-ciclo-de-rankine-problema-com-solucao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-exemplo-de-ciclo-de-rankine-problema-com-solucao-definicao\/","title":{"rendered":"O que \u00e9 exemplo de ciclo de Rankine &#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 Ciclo de Rankine &#8211; Problema com Solu\u00e7\u00e3o.\u00a0Vamos assumir o ciclo de Rankine.\u00a0Calcule principais analistas, como a qualidade do vapor, as diferen\u00e7as de entalpia e a efici\u00eancia t\u00e9rmica.\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 de ciclo Rankine &#8211; problema com solu\u00e7\u00e3o<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-Cycle-scheme.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-17771 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-Cycle-scheme.png\" alt=\"Ciclo Rankine\" width=\"300\" height=\"450\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-Cycle-scheme.png\" \/><\/a>Vamos assumir o\u00a0<strong>ciclo Rankine<\/strong>\u00a0, que \u00e9 um dos\u00a0<strong>ciclos termodin\u00e2micos<\/strong>\u00a0mais comuns\u00a0em usinas termel\u00e9tricas.\u00a0Nesse caso, assuma um ciclo simples, sem reaquecimento e sem a turbina a vapor de condensa\u00e7\u00e3o funcionando com\u00a0<a title=\"Vapor seco\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/dry-steam\/\">vapor saturado<\/a>\u00a0\u00a0(vapor seco).\u00a0Nesse caso, a turbina opera em estado estacion\u00e1rio com condi\u00e7\u00f5es de entrada de 6 MPa, t = 275,6 \u00b0 C, x = 1 (ponto 3).\u00a0O vapor sai deste est\u00e1gio da turbina a uma press\u00e3o de 0,008 MPa, 41,5 \u00b0 C e x = ???\u00a0(ponto 4)<\/p>\n<p>Calcular:<\/p>\n<ol>\n<li>a qualidade do vapor do vapor de sa\u00edda<\/li>\n<li>a diferen\u00e7a de entalpia entre estes dois estados (3 \u2192 4), a qual corresponde ao trabalho realizado pelo vapor, W\u00a0<sub>t<\/sub>\u00a0.<\/li>\n<li>a diferen\u00e7a de entalpia entre estes dois estados (1 \u2192 2), que corresponde ao trabalho feito por bombas, W\u00a0<sub>P<\/sub>\u00a0.<\/li>\n<li>a diferen\u00e7a de entalpia entre esses dois estados (2 \u2192 3), que corresponde ao calor l\u00edquido adicionado no gerador de vapor<\/li>\n<li>a efici\u00eancia termodin\u00e2mica deste ciclo e compare esse valor com a efici\u00eancia de Carnot<\/li>\n<\/ol>\n<p>1)<\/p>\n<p>Como n\u00e3o sabemos a qualidade exata do vapor de sa\u00edda, precisamos determinar esse par\u00e2metro.\u00a0O estado 4 \u00e9 fixado pela press\u00e3o\u00a0<strong>p\u00a0<sub>4<\/sub>\u00a0= 0,008 MPa<\/strong>\u00a0e o fato de que a\u00a0<a title=\"Entropia espec\u00edfica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/specific-entropy\/\">entropia espec\u00edfica<\/a>\u00a0\u00e9 constante para a expans\u00e3o isentr\u00f3pica (s\u00a0<sub>3<\/sub>\u00a0= s\u00a0<sub>4<\/sub>\u00a0= 5,89\u00a0<em>kJ \/ kgK para 6 MPa<\/em>\u00a0).\u00a0A entropia espec\u00edfica de \u00e1gua l\u00edquida saturada (x = 0) e vapor seco (x = 1) pode ser escolhida nas\u00a0<a title=\"Tabelas de Vapor - Propriedades Espec\u00edficas da \u00c1gua e Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/steam-tables\/\">tabelas de vapor<\/a>\u00a0.\u00a0No caso de vapor \u00famido, a entropia real pode ser calculada com a qualidade do vapor,\u00a0<em>x,<\/em>\u00a0e as entropias espec\u00edficas de \u00e1gua l\u00edquida saturada e vapor seco:<\/p>\n<p><em>s\u00a0<\/em><em><sub>4<\/sub><\/em><em>\u00a0= s\u00a0<\/em><em><sub>v<\/sub><\/em><em>\u00a0x + (1 &#8211; x) s\u00a0<\/em><em><sub>l<\/sub><\/em><\/p>\n<p><em><span>Onde<\/span><\/em><\/p>\n<p><em><span>s\u00a0<\/span><\/em><em><sub><span>4<\/span><\/sub><\/em><em><span>\u00a0= entropia de vapor \u00famido (J \/ kg K) =<\/span><\/em><span>\u00a05,89\u00a0<\/span><em><span>kJ \/ kgK<\/span><\/em><\/p>\n<p><em><span>s\u00a0<\/span><\/em><em><sub><span>v<\/span><\/sub><\/em><em><span>\u00a0= entropia do vapor &#8220;seco&#8221; (J \/ kg K) = 8,227 kJ \/ kgK (para 0,008 MPa)<\/span><\/em><\/p>\n<p><em><span>s\u00a0<\/span><\/em><em><sub><span>l<\/span><\/sub><\/em><em><span>\u00a0= entropia de \u00e1gua l\u00edquida saturada (J \/ kg K) = 0,592 kJ \/ kgK (para 0,008 MPa)<\/span><\/em><\/p>\n<p><span>A partir desta equa\u00e7\u00e3o, a qualidade do vapor \u00e9:<\/span><\/p>\n<p><span>x\u00a0<\/span><sub><span>4<\/span><\/sub><span>\u00a0= (\u00a0<\/span><em><span>s\u00a0<\/span><\/em><em><sub><span>4<\/span><\/sub><\/em><em><span>\u00a0&#8211; s\u00a0<\/span><\/em><em><sub><span>l<\/span><\/sub><\/em><span>\u00a0) \/ (\u00a0<\/span><em><span>s\u00a0<\/span><\/em><em><sub><span>v<\/span><\/sub><\/em><em><span>\u00a0&#8211; s\u00a0<\/span><\/em><em><sub><span>l<\/span><\/sub><\/em><span>\u00a0) = (5,89 &#8211; 0,592) \/ (8,227 &#8211; 0,592) = 0,694 = 69,4%<\/span><\/p>\n<p><span>2)<\/span><\/p>\n<p><span>A entalpia para o estado 3 pode ser coletada diretamente das tabelas de vapor, enquanto a entalpia para o estado 4 deve ser calculada usando a qualidade do vapor:<\/span><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>3, v<\/span><\/sub><\/em><em><span>\u00a0=<\/span><\/em><span>\u00a02785 kJ \/ kg<\/span><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>4, molhado<\/span><\/sub><\/em><em><span>\u00a0= h\u00a0<\/span><\/em><em><sub><span>4, v<\/span><\/sub><\/em><em><span>\u00a0x + (1 &#8211; x) h\u00a0<\/span><\/em><em><sub><span>4, l<\/span><\/sub><\/em><span>\u00a0\u00a0= 2576.\u00a00,694 + (1 &#8211; 0,694).\u00a0174 = 1787 + 53,2 = 1840 kJ \/ kg<\/span><\/p>\n<p><span>Ent\u00e3o o trabalho realizado pelo vapor, W\u00a0<\/span><sub><span>T,<\/span><\/sub><span>\u00a0\u00e9<\/span><\/p>\n<p><strong><span>W\u00a0<\/span><\/strong><strong><sub><span>T<\/span><\/sub><\/strong><span>\u00a0= \u0394h =\u00a0<\/span><strong><span>945 kJ \/ kg<\/span><\/strong><\/p>\n<p><strong><span>3)<\/span><\/strong><\/p>\n<p><span>A entalpia para o estado 1 pode ser obtida diretamente das tabelas de vapor:<\/span><\/p>\n<p><em><span>h\u00a0<\/span><\/em><em><sub><span>1, l<\/span><\/sub><\/em><em><span>\u00a0=<\/span><\/em><span>\u00a0174 kJ \/ kg<\/span><\/p>\n<p><span>O estado 2 \u00e9 fixado pela press\u00e3o p\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0= 6,0 MPa e pelo fato de a entropia espec\u00edfica ser constante para a compress\u00e3o isentr\u00f3pica (s\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0= s\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0= 0,592\u00a0<\/span><em><span>kJ \/ kgK para 0,008 MPa<\/span><\/em><span>\u00a0).\u00a0Para esta entropia s\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0=\u00a0<\/span><strong><span>0,592\u00a0<\/span><em><span>kJ \/ kgK<\/span><\/em><\/strong><span>\u00a0ep\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0= 6,0 MPa, encontramos\u00a0<\/span><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2, sub-resfriado<\/span><\/sub><\/em><\/strong><span>\u00a0em tabelas de vapor para \u00e1gua comprimida (usando interpola\u00e7\u00e3o entre dois estados).<\/span><\/p>\n<p><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2, sub-resfriado<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0=<\/span><\/em><\/strong><strong><span>\u00a0179,7 kJ \/ kg<\/span><\/strong><\/p>\n<p><span>Ent\u00e3o, o trabalho realizado pelas bombas, W\u00a0<\/span><sub><span>P,<\/span><\/sub><span>\u00a0\u00e9<\/span><\/p>\n<p><strong><span>W\u00a0<\/span><\/strong><strong><sub><span>P<\/span><\/sub><\/strong><span>\u00a0= \u0394h =\u00a0<\/span><strong><span>5,7 kJ \/ kg<\/span><\/strong><\/p>\n<p><span>4)<\/span><\/p>\n<p><span>A diferen\u00e7a de entalpia entre (2 \u2192 3), que corresponde ao calor l\u00edquido adicionado no gerador de vapor, \u00e9 simplesmente:<\/span><\/p>\n<p><strong><em><span>Q\u00a0<\/span><\/em><\/strong><strong><em><sub><span>add<\/span><\/sub><\/em><\/strong><em><span>\u00a0= h\u00a0<\/span><\/em><em><sub><span>3, v<\/span><\/sub><\/em><em><span>\u00a0\u00a0&#8211; h\u00a0<\/span><\/em><em><sub><span>2, sub-resfriado<\/span><\/sub><\/em><em><span>\u00a0= 2785 &#8211; 179,7 = \u00a0\u00a0<\/span><strong><span>2605,3 kJ \/ kg<\/span><\/strong><\/em><\/p>\n<p><span>Observe que, n\u00e3o h\u00e1 regenera\u00e7\u00e3o de calor neste ciclo.\u00a0Por outro lado, a maior parte do calor adicionado \u00e9 para a entalpia da vaporiza\u00e7\u00e3o (isto \u00e9, para a mudan\u00e7a de fase).<\/span><\/p>\n<p><span>5)<\/span><\/p>\n<p><span>Nesse caso, geradores de vapor, turbinas a vapor, condensadores e bombas de \u00e1gua de alimenta\u00e7\u00e3o constituem um motor t\u00e9rmico, sujeito \u00e0s limita\u00e7\u00f5es de efici\u00eancia impostas pela\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-segunda-lei-da-termodinamica-definicao\/\"><strong>segunda lei da termodin\u00e2mica<\/strong><\/a>\u00a0.\u00a0No caso ideal (sem atrito, processos revers\u00edveis, design perfeito), este motor t\u00e9rmico teria uma\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/second-law-of-thermodynamics\/carnot-efficiency-efficiency-of-carnot-heat-engine\/\">efici\u00eancia<\/a>\u00a0de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/second-law-of-thermodynamics\/carnot-efficiency-efficiency-of-carnot-heat-engine\/\">Carnot<\/a>\u00a0de<\/span><\/p>\n<p><strong><em><span>\u03b7\u00a0<\/span><\/em><\/strong><strong><em><sub><span>Carnot<\/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 &#8211; 315\/549 =<\/span><strong><span>\u00a042,6%<\/span><\/strong><\/p>\n<p><span>onde a temperatura do reservat\u00f3rio quente \u00e9 de 275,6 \u00b0 C (548,7 K), a temperatura do reservat\u00f3rio frio \u00e9 de 41,5 \u00b0 C (314,7 K).<\/span><\/p>\n<p><span>A efici\u00eancia termodin\u00e2mica deste ciclo pode ser calculada pela seguinte f\u00f3rmula:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-cycle-example-thermal-efficiency.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17792 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-cycle-example-thermal-efficiency.png\" alt=\"Ciclo de Rankine - exemplo - efici\u00eancia t\u00e9rmica\" width=\"159\" height=\"76\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Rankine-cycle-example-thermal-efficiency.png\" \/><\/a><\/p>\n<p><span>assim<\/span><br \/>\n<strong><em><span>\u03b7\u00a0<\/span><\/em><\/strong><strong><em><sub><span>th<\/span><\/sub><\/em><\/strong><span>\u00a0= (945 &#8211; 5,7) \/ 2605,3 = 0,361 =\u00a0<\/span><strong><span>36,1%<\/span><\/strong><\/p>\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 Ciclo de Rankine &#8211; Problema com Solu\u00e7\u00e3o.\u00a0Vamos assumir o ciclo de Rankine.\u00a0Calcule principais analistas, como a qualidade do vapor, as diferen\u00e7as de entalpia e a efici\u00eancia t\u00e9rmica.\u00a0Engenharia T\u00e9rmica Exemplo de ciclo Rankine &#8211; problema com solu\u00e7\u00e3o Vamos assumir o\u00a0ciclo Rankine\u00a0, que \u00e9 um dos\u00a0ciclos termodin\u00e2micos\u00a0mais comuns\u00a0em usinas termel\u00e9tricas.\u00a0Nesse caso, assuma um ciclo simples, &#8230; <a title=\"O que \u00e9 exemplo de ciclo de Rankine &#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-ciclo-de-rankine-problema-com-solucao-definicao\/\" aria-label=\"More on O que \u00e9 exemplo de ciclo de Rankine &#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 ciclo de Rankine - problema com solu\u00e7\u00e3o - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Exemplo de Ciclo de Rankine - Problema com Solu\u00e7\u00e3o. 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Vamos assumir o ciclo de Rankine. Calcule principais analistas, como a qualidade do vapor, as diferen\\u00e7as de entalpia e a efici\\u00eancia t\\u00e9rmica. 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