{"id":51773,"date":"2020-01-30T14:14:36","date_gmt":"2020-01-30T13:14:36","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-liquido-saturado-e-sub-resfriado-definicao\/"},"modified":"2020-01-30T14:28:10","modified_gmt":"2020-01-30T13:28:10","slug":"o-que-e-liquido-saturado-e-sub-resfriado-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-liquido-saturado-e-sub-resfriado-definicao\/","title":{"rendered":"O que \u00e9 l\u00edquido saturado e sub-resfriado &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A \u00e1gua \u00e0 temperatura e press\u00e3o de satura\u00e7\u00e3o com x = 0 \u00e9 um l\u00edquido saturado.\u00a0Em temperaturas mais baixas, \u00e9 chamado de l\u00edquido sub-resfriado ou l\u00edquido comprimido.\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>L\u00edquido saturado e sub-resfriado<\/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 diagrama de fases da \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 estado de vapor superaquecido no diagrama Ts.<\/li>\n<li>A\u00a0<strong>curva l\u00edquida saturada<\/strong>\u00a0\u00e9 a curva que separa o\u00a0<strong>estado l\u00edquido sub<\/strong>\u00a0&#8211;\u00a0<strong>resfriado<\/strong>\u00a0e o\u00a0<strong>estado de<\/strong>\u00a0duas fases no diagrama Ts.<\/li>\n<\/ul>\n<p>Se uma \u00e1gua existe como l\u00edquido na\u00a0<strong>temperatura<\/strong>\u00a0e press\u00e3o de\u00a0<strong>satura\u00e7\u00e3o<\/strong>\u00a0com qualidade de\u00a0<strong>x = 0<\/strong>\u00a0, isso \u00e9 chamado de\u00a0<strong>estado l\u00edquido saturado<\/strong>\u00a0(monof\u00e1sico).\u00a0Se a temperatura do l\u00edquido for mais baixa que a temperatura de satura\u00e7\u00e3o da press\u00e3o existente, isso ser\u00e1 chamado de\u00a0<strong>l\u00edquido sub<\/strong>\u00a0&#8211;\u00a0<strong>resfriado<\/strong>\u00a0ou\u00a0<strong>l\u00edquido comprimido<\/strong>\u00a0.\u00a0O termo\u00a0<strong>sub-resfriamento<\/strong>\u00a0refere-se a um l\u00edquido existente a uma temperatura\u00a0<strong>abaixo do<\/strong>\u00a0seu ponto de ebuli\u00e7\u00e3o normal.\u00a0Por exemplo, a \u00e1gua normalmente ferve a 100 \u00b0 C (\u00e0 press\u00e3o atmosf\u00e9rica);\u00a0\u00e0 temperatura ambiente de 20 \u00b0 C, a \u00e1gua \u00e9 denominada &#8220;sub-resfriada&#8221;.\u00a0Analogamente, o sub-resfriamento \u00e9 definido tamb\u00e9m na engenharia nuclear, mas para outro prop\u00f3sito.<\/p>\n<p>Por exemplo, a temperatura no pressurizador pode ser mantida em 350 \u00b0 C (662 \u00b0 F), o que fornece uma margem de sub-resfriamento (a diferen\u00e7a entre a temperatura do pressurizador e a temperatura mais alta no n\u00facleo do reator) de 30 \u00b0 C.\u00a0A margem de sub-resfriamento \u00e9 um par\u00e2metro de seguran\u00e7a muito importante dos PWRs, pois a ebuli\u00e7\u00e3o no n\u00facleo do reator deve ser exclu\u00edda.<\/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><span>Qualidade de Vapor &#8211; Fra\u00e7\u00e3o de Secura<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/subcooled-liquid-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16095 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/subcooled-liquid-min-300x256.png\" alt=\"sub-resfriado-l\u00edquido-min\" width=\"300\" height=\"256\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/subcooled-liquid-min-300x256.png\" \/><\/a><span>Como pode ser visto no\u00a0<\/span><strong><span>diagrama de fases da \u00e1gua<\/span><\/strong><span>\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<\/span><strong><span>propor\u00e7\u00e3o<\/span><\/strong><span>\u00a0relativa\u00a0<strong>das duas fases<\/strong>\u00a0presentes.<\/span><\/p>\n<p><span>A\u00a0<\/span><strong><span>fra\u00e7\u00e3o<\/span><\/strong><span>\u00a0de\u00a0<strong>massa<\/strong>\u00a0do vapor em uma regi\u00e3o de vapor l\u00edquido de duas fases \u00e9 chamada\u00a0<\/span><strong><span>qualidade<\/span><\/strong><span>\u00a0do\u00a0<strong>vapor<\/strong>\u00a0(ou fra\u00e7\u00e3o de secura),\u00a0<\/span><em><span>x<\/span><\/em><span>\u00a0, e \u00e9 dada pela seguinte f\u00f3rmula:<\/span><\/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><span>O valor da qualidade varia de\u00a0<\/span><strong><span>zero a unidade<\/span><\/strong><span>\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<\/span><strong><span>estado l\u00edquido saturado<\/span><\/strong><span>\u00a0(monof\u00e1sico).<\/span><\/p>\n<ul>\n<li><strong><span>Vapor Molhado<\/span><\/strong><\/li>\n<li><strong><span>Vapor seco<\/span><\/strong><\/li>\n<li><strong><span>Vapor superaquecido<\/span><\/strong><\/li>\n<\/ul>\n<p><span>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<\/span><strong><span>maior que a press\u00e3o cr\u00edtica<\/span><\/strong><span>\u00a0.\u00a0Nesse caso, n\u00e3o haveria\u00a0<\/span><strong><span>altera\u00e7\u00e3o na fase<\/span><\/strong><span>\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.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-saturacao-ponto-de-ebulicao-definicao\/\"><span>Satura\u00e7\u00e3o<\/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>Propriedades do Steam &#8211; Tabelas Steam<\/span><\/h2>\n<p><strong><span>\u00c1gua e vapor<\/span><\/strong><span>\u00a0s\u00e3o um fluido comum usado para\u00a0<\/span><strong><span>a troca de calor<\/span><\/strong><span>\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<\/span><strong><span>disponibilidade<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>alta capacidade de aquecimento,<\/span><\/strong><span>\u00a0tanto para refrigera\u00e7\u00e3o quanto para aquecimento.\u00a0\u00c9 especialmente eficaz para transportar calor atrav\u00e9s da\u00a0<\/span><strong><span>vaporiza\u00e7\u00e3o<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0da \u00e1gua devido ao seu\u00a0<\/span><strong><span>calor latente muito grande de vaporiza\u00e7\u00e3o<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Uma desvantagem \u00e9 que os reatores moderados a \u00e1gua precisam usar\u00a0<\/span><strong><span>o circuito prim\u00e1rio de alta press\u00e3o<\/span><\/strong><span>\u00a0para manter a \u00e1gua no\u00a0<\/span><strong><span>estado l\u00edquido<\/span><\/strong><span>\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).<\/span><\/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\"><span>Tabelas a vapor &#8211; par\u00e2metros comuns em sistemas de energia<\/span><\/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>&nbsp;<\/p>\n<p><span>Outros dados\u00a0<\/span><a href=\"http:\/\/webbook.nist.gov\/chemistry\/fluid\/\"><span>oficiais<\/span><\/a><span>\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.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><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 Steam<\/span><\/a><\/p>\n<p><span>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<\/span><\/p>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\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><span>Mesas de vapor<\/span><\/h2>\n<p><span>Links especiais:<\/span><br \/>\n<a href=\"https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078-Tab1.pdf\"><span>\u00a0www.nist.gov &#8211; Mesas de vapor &#8211; Satura\u00e7\u00e3o (temperatura)<\/span><\/a><br \/>\n<a href=\"https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078-Tab2.pdf\"><span>\u00a0www.nist.gov &#8211; Mesas de vapor &#8211; Satura\u00e7\u00e3o (press\u00e3o)<\/span><\/a><br \/>\n<a href=\"https:\/\/www.nist.gov\/sites\/default\/files\/documents\/srd\/NISTIR5078-Tab3.pdf\"><span>\u00a0www.nist.gov &#8211; Mesas de vapor &#8211; \u00c1gua comprimida &#8211; Vapor superaquecido<\/span><\/a><\/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<div class=\"su-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\">\n<div class=\"su-spoiler-content su-clearfix\">\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A \u00e1gua \u00e0 temperatura e press\u00e3o de satura\u00e7\u00e3o com x = 0 \u00e9 um l\u00edquido saturado.\u00a0Em temperaturas mais baixas, \u00e9 chamado de l\u00edquido sub-resfriado ou l\u00edquido comprimido.\u00a0Engenharia T\u00e9rmica L\u00edquido saturado e sub-resfriado Diagrama de fases da \u00e1gua. Fonte: wikipedia.org CC BY-SA Como pode ser visto no diagrama de fases da \u00e1gua, nas regi\u00f5es bif\u00e1sicas (por &#8230; <a title=\"O que \u00e9 l\u00edquido saturado e sub-resfriado &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-liquido-saturado-e-sub-resfriado-definicao\/\" aria-label=\"More on O que \u00e9 l\u00edquido saturado e sub-resfriado &#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 l\u00edquido saturado e sub-resfriado - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A \u00e1gua \u00e0 temperatura e press\u00e3o de satura\u00e7\u00e3o com x = 0 \u00e9 um l\u00edquido saturado. 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