{"id":51765,"date":"2020-01-30T14:08:56","date_gmt":"2020-01-30T13:08:56","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-vapor-superaquecido-definicao\/"},"modified":"2020-01-30T14:34:10","modified_gmt":"2020-01-30T13:34:10","slug":"o-que-e-vapor-superaquecido-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-vapor-superaquecido-definicao\/","title":{"rendered":"O que \u00e9 vapor superaquecido &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Vapor superaquecido \u00e9 um vapor a uma temperatura superior ao seu ponto de ebuli\u00e7\u00e3o \u00e0 press\u00e3o absoluta.\u00a0As propriedades do vapor seco s\u00e3o tabuladas em tabelas de vapor.\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>Vapor superaquecido<\/h2>\n<figure id=\"attachment_14172\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-14172\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boiling-point-of-water.png\"><img loading=\"lazy\" class=\"size-medium wp-image-14172 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boiling-point-of-water-300x255.png\" alt=\"Diagrama de fases da \u00e1gua\" width=\"300\" height=\"255\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boiling-point-of-water-300x255.png\" \/><\/a><figcaption id=\"caption-attachment-14172\" class=\"wp-caption-text\">Diagrama de fases da \u00e1gua.<br \/>\nFonte: wikipedia.org CC BY-SA<\/figcaption><\/figure>\n<p>Como pode ser visto no\u00a0<strong>diagrama<\/strong>\u00a0de\u00a0<strong>fases<\/strong>\u00a0da \u00e1gua, nas regi\u00f5es bif\u00e1sicas (por exemplo, na fronteira das fases vapor \/ l\u00edquido), a especifica\u00e7\u00e3o da temperatura sozinha definir\u00e1 a press\u00e3o e a press\u00e3o especificada definir\u00e1 a temperatura.<\/p>\n<ul>\n<li>A curva de vapor de satura\u00e7\u00e3o \u00e9 a curva que separa o estado de duas fases e o\u00a0<strong>estado de vapor superaquecido<\/strong>\u00a0no diagrama Ts.<\/li>\n<li>A curva l\u00edquida saturada \u00e9 a curva que separa o estado l\u00edquido sub-resfriado e o estado de duas fases no diagrama Ts.<\/li>\n<\/ul>\n<p>Se um vapor existe inteiramente como vapor na temperatura de satura\u00e7\u00e3o, \u00e9 chamado\u00a0<strong>vapor\u00a0<\/strong><strong>saturado<\/strong>\u00a0ou\u00a0<strong>vapor\u00a0<\/strong><strong>saturado<\/strong>\u00a0ou\u00a0<strong>vapor seco<\/strong>\u00a0.\u00a0O vapor saturado seco \u00e9 caracterizado pela qualidade do vapor, que \u00e9 igual \u00e0 unidade.\u00a0<strong>Vapor\u00a0<\/strong><strong>superaquecido<\/strong>\u00a0ou\u00a0<strong>vapor\u00a0<\/strong><strong>superaquecido<\/strong>\u00a0\u00e9 um vapor a uma temperatura\u00a0<strong>superior ao seu ponto de ebuli\u00e7\u00e3o<\/strong>\u00a0\u00e0 press\u00e3o absoluta em que a temperatura \u00e9 medida.\u00a0A press\u00e3o e a temperatura do\u00a0<strong>vapor superaquecido<\/strong>\u00a0s\u00e3o propriedades independentes, pois a temperatura pode aumentar enquanto a press\u00e3o permanece constante.\u00a0Na verdade, as subst\u00e2ncias que chamamos de gases s\u00e3o\u00a0<strong>vapores superaquecidos.<\/strong><\/p>\n<figure id=\"attachment_16026\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16026\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-Cycles-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16026 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-Cycles-min-300x277.png\" alt=\"termodin\u00e2mica de engenharia\" width=\"300\" height=\"277\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-Cycles-min-300x277.png\" \/><\/a><figcaption id=\"caption-attachment-16026\" class=\"wp-caption-text\">Ciclo de Rankine &#8211; Termodin\u00e2mica como ci\u00eancia de convers\u00e3o de energia<\/figcaption><\/figure>\n<p>O processo de superaquecimento do vapor de \u00e1gua no diagrama Ts \u00e9 fornecido na figura entre o estado E e a curva de vapor de satura\u00e7\u00e3o.\u00a0Como pode ser visto, as turbinas a vapor \u00famidas usam\u00a0<strong>vapor superaquecido,<\/strong>\u00a0especialmente na entrada dos est\u00e1gios de baixa press\u00e3o.\u00a0Para avaliar a efici\u00eancia t\u00e9rmica do ciclo, a entalpia deve ser obtida 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>\u00a0superaquecido\u00a0.<\/p>\n<p>O processo de superaquecimento \u00e9 a \u00fanica maneira de\u00a0<strong>aumentar a temperatura<\/strong>\u00a0de\u00a0<strong>pico<\/strong>\u00a0do ciclo Rankine (e aumentar a efici\u00eancia) sem aumentar a press\u00e3o da caldeira.\u00a0Isso requer a adi\u00e7\u00e3o de outro tipo de trocador de calor chamado\u00a0<strong>superaquecedor<\/strong>\u00a0, que produz o\u00a0<strong>vapor superaquecido<\/strong>\u00a0.<\/p>\n<p>No superaquecedor, o aquecimento adicional a press\u00e3o fixa resulta em aumentos de temperatura e volume espec\u00edfico.\u00a0O processo de superaquecimento no diagrama Ts \u00e9 fornecido na figura entre o estado\u00a0<strong>E<\/strong>\u00a0e a\u00a0<strong>curva de vapor de satura\u00e7\u00e3o<\/strong>\u00a0.<\/p>\n<p>Normalmente, a maioria das\u00a0<strong>usinas nucleares<\/strong>\u00a0opera\u00a0<strong>turbinas a vapor de condensa\u00e7\u00e3o de v\u00e1rios est\u00e1gios<\/strong>\u00a0.\u00a0Nessas turbinas, o est\u00e1gio de alta press\u00e3o recebe vapor (esse vapor \u00e9 quase o vapor saturado &#8211; x = 0,995 &#8211; ponto C na figura) de um gerador de vapor e o esgota no separador-reaquecedor de umidade (ponto D).\u00a0O vapor deve ser\u00a0<strong>reaquecido ou superaquecido<\/strong>para evitar danos que possam ser causados \u200b\u200b\u00e0s p\u00e1s da turbina a vapor por vapor de baixa qualidade.\u00a0O alto conte\u00fado de got\u00edculas de \u00e1gua pode causar o r\u00e1pido impacto e a eros\u00e3o das p\u00e1s, o que ocorre quando a \u00e1gua condensada \u00e9 jateada sobre as p\u00e1s.\u00a0Para evitar isso, drenos de condensa\u00e7\u00e3o s\u00e3o instalados na tubula\u00e7\u00e3o de vapor que leva \u00e0 turbina.\u00a0O reaquecedor aquece o vapor (ponto D) e, em seguida, o vapor \u00e9 direcionado para o est\u00e1gio de baixa press\u00e3o da turbina a vapor, onde se expande (pontos E a F).\u00a0O vapor esgotado est\u00e1 a uma press\u00e3o bem abaixo da atmosf\u00e9rica e est\u00e1 em um estado parcialmente condensado (ponto F), tipicamente com uma qualidade pr\u00f3xima a 90%.<\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/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<h2>Qualidade de Vapor &#8211; Fra\u00e7\u00e3o de Secura<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superheated-steam-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16096 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superheated-steam-min-300x256.png\" alt=\"superaquecido-vapor-min\" width=\"300\" height=\"256\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superheated-steam-min-300x256.png\" \/><\/a>Como pode ser visto no\u00a0<strong>diagrama de fases da \u00e1gua<\/strong>\u00a0, nas regi\u00f5es bif\u00e1sicas (por exemplo, na fronteira das fases vapor \/ l\u00edquido), a especifica\u00e7\u00e3o da temperatura por si s\u00f3 definir\u00e1 a press\u00e3o e a especifica\u00e7\u00e3o da press\u00e3o definir\u00e1 a temperatura.\u00a0Mas esses par\u00e2metros n\u00e3o definir\u00e3o o volume e a entalpia, pois precisaremos conhecer a\u00a0<strong>propor\u00e7\u00e3o<\/strong>\u00a0relativa\u00a0<strong>das duas fases<\/strong>\u00a0presentes.<\/p>\n<p>A\u00a0<strong>fra\u00e7\u00e3o<\/strong>\u00a0de\u00a0<strong>massa<\/strong>\u00a0do vapor em uma regi\u00e3o de vapor l\u00edquido de duas fases \u00e9 chamada\u00a0<strong>qualidade<\/strong>\u00a0do\u00a0<strong>vapor<\/strong>\u00a0(ou fra\u00e7\u00e3o de secura),\u00a0<em>x<\/em>\u00a0, e \u00e9 dada pela seguinte f\u00f3rmula:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Vapor-quality.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-16088 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Vapor-quality.png\" alt=\"qualidade de vapor\" width=\"189\" height=\"154\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Vapor-quality.png\" \/><\/a><\/p>\n<p>O valor da qualidade varia de\u00a0<strong>zero a unidade<\/strong>\u00a0.\u00a0Embora definida como uma propor\u00e7\u00e3o, a qualidade \u00e9 frequentemente fornecida como uma porcentagem.\u00a0Deste ponto de vista, distinguimos entre tr\u00eas tipos b\u00e1sicos de vapor.\u00a0Deve ser adicionado, em x = 0, estamos falando de\u00a0<strong>estado l\u00edquido saturado<\/strong>\u00a0(monof\u00e1sico).<\/p>\n<ul>\n<li><a title=\"Vapor Molhado\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/wet-steam\/\"><strong>Vapor Molhado<\/strong><\/a><\/li>\n<li><a title=\"Vapor seco\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/dry-steam\/\"><strong>Vapor seco<\/strong><\/a><\/li>\n<li><a title=\"Vapor superaquecido\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/superheated-steam\/\"><strong>Vapor superaquecido<\/strong><\/a><\/li>\n<\/ul>\n<p>Esta classifica\u00e7\u00e3o de vapor tem sua limita\u00e7\u00e3o.\u00a0Considere o comportamento do sistema que \u00e9 aquecido \u00e0 press\u00e3o, que \u00e9\u00a0<strong>maior que a press\u00e3o cr\u00edtica<\/strong>\u00a0.\u00a0Nesse caso, n\u00e3o haveria\u00a0<strong>altera\u00e7\u00e3o na fase<\/strong>\u00a0do l\u00edquido para o vapor.\u00a0Em todos os estados, haveria apenas uma fase.\u00a0A vaporiza\u00e7\u00e3o e a condensa\u00e7\u00e3o podem ocorrer apenas quando a press\u00e3o \u00e9 menor que a press\u00e3o cr\u00edtica.\u00a0Os termos l\u00edquido e vapor tendem a perder seu significado.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-saturacao-ponto-de-ebulicao-definicao\/\">Satura\u00e7\u00e3o<\/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>Propriedades do Steam &#8211; Tabelas Steam<\/h2>\n<p><strong>\u00c1gua e vapor<\/strong>\u00a0s\u00e3o um fluido comum usado para\u00a0<strong>a troca de calor<\/strong>\u00a0no circuito prim\u00e1rio (da superf\u00edcie das barras de combust\u00edvel ao fluxo do l\u00edquido de refrigera\u00e7\u00e3o) e no circuito secund\u00e1rio.\u00a0\u00c9 utilizado devido \u00e0 sua\u00a0<strong>disponibilidade<\/strong>\u00a0e\u00a0<strong>alta capacidade de aquecimento,<\/strong>\u00a0tanto para refrigera\u00e7\u00e3o quanto para aquecimento.\u00a0\u00c9 especialmente eficaz para transportar calor atrav\u00e9s da\u00a0<strong>vaporiza\u00e7\u00e3o<\/strong>\u00a0e\u00a0<strong>condensa\u00e7\u00e3o<\/strong>\u00a0da \u00e1gua devido ao seu\u00a0<strong>calor latente muito grande de vaporiza\u00e7\u00e3o<\/strong>\u00a0.<\/p>\n<p>Uma desvantagem \u00e9 que os reatores moderados a \u00e1gua precisam usar\u00a0<strong>o circuito prim\u00e1rio de alta press\u00e3o<\/strong>\u00a0para manter a \u00e1gua no\u00a0<strong>estado l\u00edquido<\/strong>\u00a0e para obter efici\u00eancia termodin\u00e2mica suficiente.\u00a0\u00c1gua e vapor tamb\u00e9m reagem com metais comumente encontrados em ind\u00fastrias como a\u00e7o e cobre, que s\u00e3o oxidados mais rapidamente por \u00e1gua e vapor n\u00e3o tratados.\u00a0Em quase todas as centrais t\u00e9rmicas (carv\u00e3o, g\u00e1s, nuclear), a \u00e1gua \u00e9 usada como fluido de trabalho (usado em um circuito fechado entre caldeira, turbina a vapor e condensador) e o l\u00edquido de arrefecimento (usado para trocar o calor residual por um corpo de \u00e1gua) ou carregue-o por evapora\u00e7\u00e3o em uma torre de resfriamento).<\/p>\n<figure id=\"attachment_16050\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16050\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Steam-Tables.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16050 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Steam-Tables-266x300.png\" alt=\"Propriedades da \u00e1gua - mesas a vapor\" width=\"266\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Steam-Tables-266x300.png\" \/><\/a><figcaption id=\"caption-attachment-16050\" class=\"wp-caption-text\">Tabelas a vapor &#8211; par\u00e2metros comuns em sistemas de energia<\/figcaption><\/figure>\n<p><strong>\u00c1gua e vapor <\/strong>s\u00e3o um meio comum, porque suas propriedades s\u00e3o muito\u00a0<strong>conhecidas<\/strong>\u00a0.\u00a0Suas propriedades est\u00e3o tabuladas nas chamadas &#8221;\u00a0<strong>Tabelas Steam\u00a0<\/strong>&#8220;.\u00a0Nessas tabelas, as propriedades b\u00e1sicas e principais, como press\u00e3o, temperatura, entalpia, densidade e calor espec\u00edfico, s\u00e3o tabuladas ao longo da curva de satura\u00e7\u00e3o vapor-l\u00edquido em fun\u00e7\u00e3o da temperatura e da press\u00e3o.\u00a0As propriedades tamb\u00e9m s\u00e3o tabuladas para estados monof\u00e1sicos (<strong>\u00a0\u00e1gua compactada\u00a0<\/strong>ou\u00a0<strong>vapor superaquecido\u00a0<\/strong>) em uma grade de temperaturas e press\u00f5es que se estendem a 2000 \u00baC e 1000 MPa.<\/p>\n<p>Outros dados\u00a0<a href=\"http:\/\/webbook.nist.gov\/chemistry\/fluid\/\">oficiais<\/a>\u00a0abrangentes podem ser encontrados na\u00a0p\u00e1gina\u00a0do\u00a0<a href=\"http:\/\/webbook.nist.gov\/chemistry\/fluid\/\">NIST Webbook<\/a>\u00a0sobre propriedades termof\u00edsicas de fluidos.<\/p>\n<p>Veja tamb\u00e9m:\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 Steam<\/a><\/p>\n<p>Refer\u00eancia especial: Allan H. Harvey.\u00a0Propriedades termodin\u00e2micas da \u00e1gua, NISTIR 5078. Recuperado em https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078.htm<\/p>\n<p>&nbsp;<\/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<h2>Mesas de vapor<\/h2>\n<p>Links especiais:<br \/>\n<a href=\"https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078-Tab1.pdf\">\u00a0www.nist.gov &#8211; Mesas de vapor &#8211; Satura\u00e7\u00e3o (temperatura)<\/a><br \/>\n<a href=\"https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078-Tab2.pdf\">\u00a0www.nist.gov &#8211; Mesas de vapor &#8211; Satura\u00e7\u00e3o (press\u00e3o)<\/a><br \/>\n<a href=\"https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078-Tab3.pdf\">\u00a0www.nist.gov &#8211; Mesas de vapor &#8211; \u00c1gua comprimida &#8211; Vapor superaquecido<\/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\"><\/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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Vapor superaquecido \u00e9 um vapor a uma temperatura superior ao seu ponto de ebuli\u00e7\u00e3o \u00e0 press\u00e3o absoluta.\u00a0As propriedades do vapor seco s\u00e3o tabuladas em tabelas de vapor.\u00a0Engenharia T\u00e9rmica Vapor superaquecido Diagrama de fases da \u00e1gua. Fonte: wikipedia.org CC BY-SA Como pode ser visto no\u00a0diagrama\u00a0de\u00a0fases\u00a0da \u00e1gua, nas regi\u00f5es bif\u00e1sicas (por exemplo, na fronteira das fases vapor &#8230; <a title=\"O que \u00e9 vapor superaquecido &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-vapor-superaquecido-definicao\/\" aria-label=\"More on O que \u00e9 vapor superaquecido &#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 vapor superaquecido - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Vapor superaquecido \u00e9 um vapor a uma temperatura superior ao seu ponto de ebuli\u00e7\u00e3o \u00e0 press\u00e3o absoluta. 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