{"id":51806,"date":"2020-01-31T12:50:15","date_gmt":"2020-01-31T11:50:15","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-o-steam-propriedades-do-steam-definicao\/"},"modified":"2021-06-03T14:29:56","modified_gmt":"2021-06-03T13:29:56","slug":"o-que-e-o-steam-propriedades-do-steam-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-steam-propriedades-do-steam-definicao\/","title":{"rendered":"Propriedades do vapor &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Propriedades do vapor. O vapor \u00e9 um g\u00e1s invis\u00edvel que consiste em \u00e1gua vaporizada. As propriedades do vapor s\u00e3o tabuladas nas chamadas &#8220;Tabelas de vapor&#8221;. Engenharia 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>O que \u00e9 vapor<\/h2>\n<p><strong>O vapor<\/strong>\u00a0\u00e9 um\u00a0<strong>g\u00e1s invis\u00edvel que<\/strong>\u00a0consiste em \u00e1gua vaporizada, formada quando a \u00e1gua ferve.\u00a0Quando o vapor \u00e9 vis\u00edvel, ele cont\u00e9m a n\u00e9voa vis\u00edvel das gotas de \u00e1gua.\u00a0Esse vapor \u00e9 chamado de &#8221;\u00a0<strong>vapor \u00famido<\/strong>\u00a0&#8220;, mas &#8221;\u00a0<strong>vapor seco<\/strong>\u00a0&#8221; \u00e9 sempre invis\u00edvel.\u00a0Em press\u00f5es mais baixas, como na atmosfera superior ou no condensador de usinas termel\u00e9tricas, o vapor pode existir a uma temperatura mais baixa do que os 100 \u00b0 C nominais na temperatura e press\u00e3o padr\u00e3o.<\/p>\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><strong>Como a \u00e1gua e o vapor<\/strong>\u00a0s\u00e3o meios comuns usados \u200b\u200bpara\u00a0<strong>troca de calor<\/strong>\u00a0e\u00a0<strong>convers\u00e3o de energia, o<\/strong>\u00a0vapor \u00e9 gerado em larga escala por sistemas de energia, como, por exemplo, em usinas termel\u00e9tricas.\u00a0Como \u00e9 t\u00edpico em todas as usinas t\u00e9rmicas convencionais, o calor \u00e9 usado para gerar vapor que aciona uma turbina a vapor conectada a um gerador que produz eletricidade.\u00a0Observe que as modernas turbinas a vapor s\u00e3o usadas para gerar mais de 80% da eletricidade do mundo.<\/p>\n<p>O vapor \u00e9 geralmente classificado de acordo com a fra\u00e7\u00e3o de vapor \/ (l\u00edquido + vapor).\u00a0Essa fra\u00e7\u00e3o \u00e9 um par\u00e2metro muito importante do vapor e \u00e9 conhecida como qualidade do vapor.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a title=\"Propriedades da \u00c1gua\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-of-water\/\">Propriedades da \u00e1gua<\/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<h2>Qualidade de Vapor &#8211; Fra\u00e7\u00e3o de Secura<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16093 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min-300x256.png\" alt=\"molhado-vapor-vapor-l\u00edquido-mistura-min\" width=\"300\" height=\"256\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-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.\u00a0Na press\u00e3o, que \u00e9\u00a0\u00a0<strong>maior que a press\u00e3o cr\u00edtica, a\u00a0<\/strong>\u00a0\u00a0\u00e1gua est\u00e1 em um estado especial, conhecido como\u00a0<a title=\"Fluido Supercr\u00edtico - \u00c1gua Supercr\u00edtica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/supercritical-fluid-supercritical-water\/\"><strong>estado de fluido supercr\u00edtico<\/strong><\/a>\u00a0.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/what-is-saturation-boiling-point-definition\/\">Satura\u00e7\u00e3o<\/a><\/p>\n<p>Veja tamb\u00e9m:\u00a0<a title=\"Fluido Supercr\u00edtico - \u00c1gua Supercr\u00edtica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/supercritical-fluid-supercritical-water\/\">Fluido supercr\u00edtico<\/a><\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/what-is-throttling-process-isenthalpic-process-definition\/\">Limita\u00e7\u00e3o do vapor<\/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 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>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\u00a0<\/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<\/strong>\u00a0&#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<\/strong>\u00a0ou\u00a0<strong>vapor superaquecido<\/strong>\u00a0) 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 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>&#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","protected":false},"excerpt":{"rendered":"<p>Propriedades do vapor. O vapor \u00e9 um g\u00e1s invis\u00edvel que consiste em \u00e1gua vaporizada. As propriedades do vapor s\u00e3o tabuladas nas chamadas &#8220;Tabelas de vapor&#8221;. Engenharia T\u00e9rmica O que \u00e9 vapor O vapor\u00a0\u00e9 um\u00a0g\u00e1s invis\u00edvel que\u00a0consiste em \u00e1gua vaporizada, formada quando a \u00e1gua ferve.\u00a0Quando o vapor \u00e9 vis\u00edvel, ele cont\u00e9m a n\u00e9voa vis\u00edvel das gotas &#8230; <a title=\"Propriedades do vapor &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-steam-propriedades-do-steam-definicao\/\" aria-label=\"More on Propriedades do vapor &#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>Propriedades do vapor - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Propriedades do vapor. 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O vapor \\u00e9 um g\\u00e1s invis\\u00edvel que consiste em \\u00e1gua vaporizada. As propriedades do vapor s\\u00e3o tabuladas nas chamadas \\\"Tabelas de vapor\\\". 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