{"id":47236,"date":"2019-11-03T17:48:50","date_gmt":"2019-11-03T16:48:50","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-condensacao-transferencia-de-calor-definicao\/"},"modified":"2020-01-22T17:03:19","modified_gmt":"2020-01-22T16:03:19","slug":"o-que-e-condensacao-transferencia-de-calor-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condensacao-transferencia-de-calor-definicao\/","title":{"rendered":"O que \u00e9 Condensa\u00e7\u00e3o &#8211; Transfer\u00eancia de Calor &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Condensa\u00e7\u00e3o \u00e9 a mudan\u00e7a do estado f\u00edsico da mat\u00e9ria da fase gasosa para a fase l\u00edquida e \u00e9 o inverso da vaporiza\u00e7\u00e3o.\u00a0Condensa\u00e7\u00e3o &#8211; Transfer\u00eancia de Calor<\/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>Condensa\u00e7\u00e3o<\/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>Da mesma forma que no cap\u00edtulo anterior, neste cap\u00edtulo, discutiremos a transfer\u00eancia de calor com a mudan\u00e7a de fase, mas, neste caso, discutiremos a\u00a0<strong>condensa\u00e7\u00e3o<\/strong>\u00a0da fase gasosa (mudan\u00e7a de fase de vapor para l\u00edquido).<\/p>\n<p>Em geral, a\u00a0<strong>condensa\u00e7\u00e3o<\/strong>\u00a0\u00e9 a mudan\u00e7a do estado f\u00edsico da mat\u00e9ria da fase gasosa para a fase l\u00edquida e \u00e9 o\u00a0<strong>inverso da vaporiza\u00e7\u00e3o<\/strong>\u00a0.\u00a0Os processos de fluxo associados \u00e0\u00a0<strong>condensa\u00e7\u00e3o<\/strong> em uma superf\u00edcie s\u00f3lida s\u00e3o quase uma imagem espelhada dos envolvidos na fervura. A condensa\u00e7\u00e3o ocorre quando a temperatura de um vapor \u00e9 reduzida abaixo da temperatura de satura\u00e7\u00e3o ou quando a press\u00e3o de um vapor \u00e9 aumentada acima dos par\u00e2metros de satura\u00e7\u00e3o (consulte o diagrama de fases da \u00e1gua).<\/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\"><span>Para a\u00a0<\/span><strong><span>condensa\u00e7\u00e3o, os<\/span><\/strong><span>\u00a0efeitos de calor latente associados \u00e0 mudan\u00e7a de fase s\u00e3o significativos, da mesma forma que na fervura, mas ao contr\u00e1rio.\u00a0Observe que a\u00a0<\/span><strong><span>entalpia da condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0(ou\u00a0<\/span><strong><span>calor da condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0) \u00e9 por defini\u00e7\u00e3o igual \u00e0 entalpia da vaporiza\u00e7\u00e3o com o sinal oposto.\u00a0Calor latente \u00e9 a quantidade de calor adicionada ou removida de uma subst\u00e2ncia para produzir uma mudan\u00e7a de fase.\u00a0Durante a vaporiza\u00e7\u00e3o, essa energia decomp\u00f5e as for\u00e7as de atra\u00e7\u00e3o intermoleculares e tamb\u00e9m deve fornecer a energia necess\u00e1ria para expandir o g\u00e1s (o\u00a0<\/span><strong><span>trabalho p\u0394V<\/span><\/strong><span>\u00a0).\u00a0Quando o calor latente \u00e9 adicionado ou removido, nenhuma mudan\u00e7a de temperatura ocorre.\u00a0A entalpia da vaporiza\u00e7\u00e3o \u00e9 uma fun\u00e7\u00e3o da press\u00e3o na qual essa transforma\u00e7\u00e3o ocorre.<\/span><\/p>\n<figure id=\"attachment_16677\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16677\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Specific-Enthalpy-Water-and-Steam-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16677 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Specific-Enthalpy-Water-and-Steam-min-242x300.png\" alt=\"Calor latente de vaporiza\u00e7\u00e3o - \u00e1gua a 0,1 MPa, 3 MPa, 16 MPa\" width=\"242\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Specific-Enthalpy-Water-and-Steam-min-242x300.png\" \/><\/a><figcaption id=\"caption-attachment-16677\" class=\"wp-caption-text\"><span>O calor da vaporiza\u00e7\u00e3o diminui com o aumento da press\u00e3o, enquanto o ponto de ebuli\u00e7\u00e3o aumenta.\u00a0Ele desaparece completamente em um determinado ponto chamado ponto cr\u00edtico.<\/span><\/figcaption><\/figure>\n<p><span>Calor latente de condensa\u00e7\u00e3o &#8211; \u00e1gua a 0,1 MPa (press\u00e3o atmosf\u00e9rica)<\/span><\/p>\n<p><strong><span>h\u00a0<\/span><\/strong><strong><sub><span>lg<\/span><\/sub><\/strong><strong><span>\u00a0= &#8211; 2257 kJ \/ kg<\/span><\/strong><\/p>\n<p><span>Calor latente de condensa\u00e7\u00e3o &#8211; \u00e1gua a 3 MPa<\/span><\/p>\n<p><strong><span>h\u00a0<\/span><\/strong><strong><sub><span>lg<\/span><\/sub><\/strong><strong><span>\u00a0= &#8211; 1795 kJ \/ kg<\/span><\/strong><\/p>\n<p><span>Calor latente de condensa\u00e7\u00e3o &#8211; \u00e1gua a 16 MPa (press\u00e3o dentro de um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/pressurizer\/\"><span>pressurizador<\/span><\/a><span>\u00a0)<\/span><\/p>\n<p><strong><span>h\u00a0<\/span><\/strong><strong><sub><span>lg<\/span><\/sub><\/strong><strong><span>\u00a0= &#8211; 931 kJ \/ kg<\/span><\/strong><\/p>\n<p><span>O\u00a0<\/span><strong><span>calor da condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0diminui com o aumento da press\u00e3o, enquanto o\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-saturacao-ponto-de-ebulicao-definicao\/\"><span>ponto de ebuli\u00e7\u00e3o<\/span><\/a><span>\u00a0aumenta.\u00a0Ele desaparece completamente em um determinado ponto chamado\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-of-water\/critical-point-of-water\/\"><span>ponto cr\u00edtico<\/span><\/a><span>\u00a0.\u00a0Acima do ponto cr\u00edtico, as fases l\u00edquida e de vapor s\u00e3o indistingu\u00edveis, e a subst\u00e2ncia \u00e9 chamada de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/supercritical-fluid-supercritical-water\/\"><span>fluido supercr\u00edtico<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><span>A mudan\u00e7a do estado l\u00edquido para o vapor devido \u00e0 ebuli\u00e7\u00e3o \u00e9 sustentada pela transfer\u00eancia de calor da superf\u00edcie s\u00f3lida;\u00a0por outro lado, a\u00a0<\/span><strong><span>condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0de um vapor no estado l\u00edquido resulta na transfer\u00eancia de calor para a superf\u00edcie s\u00f3lida.\u00a0A ebuli\u00e7\u00e3o e a condensa\u00e7\u00e3o diferem de outras formas de convec\u00e7\u00e3o, pois dependem do calor latente de vaporiza\u00e7\u00e3o, que \u00e9 muito alto para press\u00f5es comuns; portanto, grandes quantidades de calor podem ser transferidas durante a ebuli\u00e7\u00e3o e a condensa\u00e7\u00e3o, essencialmente\u00a0<\/span><strong><span>a temperatura constante<\/span><\/strong><span>\u00a0.\u00a0<\/span><a title=\"Coeficiente de transfer\u00eancia de calor por convec\u00e7\u00e3o\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-coeficiente-de-transferencia-de-calor-por-conveccao-definicao\/\"><strong><span>Os coeficientes de transfer\u00eancia de calor<\/span><\/strong><\/a><span>\u00a0, h, associados \u00e0 ebuli\u00e7\u00e3o e condensa\u00e7\u00e3o s\u00e3o tipicamente muito mais altos do que os encontrados em outras formas de processos de convec\u00e7\u00e3o que envolvem uma \u00fanica fase.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Modos de Condensa\u00e7\u00e3o &#8211; Tipos de Condensa\u00e7\u00e3o<\/span><\/h2>\n<p><span>Do ponto de vista pr\u00e1tico da engenharia, a\u00a0<\/span><strong><span>condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0pode ser categorizada de acordo com\u00a0<\/span><strong><span>v\u00e1rios crit\u00e9rios<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Em geral, s\u00e3o observadas tr\u00eas formas distintas de condensa\u00e7\u00e3o:<\/span><\/p>\n<ul>\n<li><strong><span>Condensa\u00e7\u00e3o de filme<\/span><\/strong><span>\u00a0.\u00a0Na\u00a0<\/span><strong><span>condensa\u00e7\u00e3o do filme<\/span><\/strong><span>\u00a0, o condensado molha a superf\u00edcie e forma um filme l\u00edquido na superf\u00edcie que desliza sob a influ\u00eancia da gravidade.\u00a0A condensa\u00e7\u00e3o do filme resulta em baixas taxas de transfer\u00eancia de calor, pois o filme de condensado impede a transfer\u00eancia de calor.\u00a0A espessura do filme formado depende de muitos par\u00e2metros, incluindo orienta\u00e7\u00e3o da superf\u00edcie, viscosidade, taxa de condensa\u00e7\u00e3o etc. O filme aumenta\u00a0<\/span><a title=\"Resist\u00eancia t\u00e9rmica - analogia \u00e0 resist\u00eancia el\u00e9trica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/thermal-conduction\/thermal-resistance-thermal-resistivity\/thermal-resistance-analogy-to-electric-resistance\/\"><span>a resist\u00eancia t\u00e9rmica<\/span><\/a><span>\u00a0ao fluxo de calor entre a superf\u00edcie e o vapor.\u00a0A taxa de transfer\u00eancia de calor \u00e9 reduzida devido a essa resist\u00eancia.<\/span><\/li>\n<li><strong><span>Condensa\u00e7\u00e3o gota a gota<\/span><\/strong><span>\u00a0.\u00a0Na condensa\u00e7\u00e3o gota a gota, o vapor condensado forma got\u00edculas na superf\u00edcie em vez de um filme cont\u00ednuo.\u00a0A condensa\u00e7\u00e3o gota a gota pode ocorrer quando a superf\u00edcie n\u00e3o est\u00e1\u00a0<\/span><strong><span>molhando<\/span><\/strong><span>\u00a0ou essas got\u00edculas s\u00e3o retiradas da superf\u00edcie por fluxo externo ou por gravidade.\u00a0O vapor est\u00e1 em contato direto com a superf\u00edcie na maior parte da \u00e1rea e as taxas de transfer\u00eancia de calor s\u00e3o muito maiores (mais de 3 a 10 vezes mais), pois h\u00e1 muito pouca resist\u00eancia ao fluxo de calor entre o vapor e a superf\u00edcie.\u00a0As got\u00edculas se desenvolvem nos locais de nuclea\u00e7\u00e3o (pontos de imperfei\u00e7\u00f5es da superf\u00edcie, como cavidades, arranh\u00f5es e cavidades) e crescem em tamanho \u00e0 medida que mais vapor se condensa na superf\u00edcie exposta.\u00a0Para\u00a0<\/span><a title=\"Condensador Principal - Condensador a Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/\"><strong><span>condensadores de vapor<\/span><\/strong><\/a><span>, \u00e9 pr\u00e1tica comum usar revestimentos de superf\u00edcie (silicons, teflons ou ceras) que inibem a umecta\u00e7\u00e3o e, portanto, estimulam a condensa\u00e7\u00e3o gota a gota.\u00a0Mas os revestimentos perdem gradualmente sua efic\u00e1cia devido \u00e0 remo\u00e7\u00e3o, oxida\u00e7\u00e3o etc.\u00a0Como na maioria das aplica\u00e7\u00f5es de engenharia, muitas vezes \u00e9 dif\u00edcil manter essa condi\u00e7\u00e3o, o uso do valor dos coeficientes de transfer\u00eancia de calor assumindo que a condensa\u00e7\u00e3o gota a gota para fins de projeto n\u00e3o \u00e9 aconselh\u00e1vel.<\/span><\/li>\n<li><strong><span>Condensa\u00e7\u00e3o por contato direto.\u00a0<\/span><\/strong><span>A condensa\u00e7\u00e3o de contato direto, DCC, ocorre quando o vapor entra em contato com um l\u00edquido frio.\u00a0Como nos condensadores de jato, a \u00e1gua de resfriamento \u00e9 pulverizada no vapor de exaust\u00e3o e h\u00e1\u00a0<\/span><strong><span>contato direto<\/span><\/strong><span>\u00a0entre o vapor de exaust\u00e3o e a \u00e1gua de resfriamento.\u00a0O processo de condensa\u00e7\u00e3o \u00e9\u00a0<\/span><strong><span>muito r\u00e1pido<\/span><\/strong><span>\u00a0e eficiente, mas aqui a \u00e1gua de resfriamento e o vapor condensado s\u00e3o\u00a0<\/span><strong><span>misturados<\/span><\/strong><span>.\u00a0As vantagens da condensa\u00e7\u00e3o de contato direto sobre os processos convencionais usando superf\u00edcies de transfer\u00eancia met\u00e1licas s\u00e3o devidas \u00e0 relativa simplicidade do projeto, menos problemas de corros\u00e3o e descama\u00e7\u00e3o, custos de manuten\u00e7\u00e3o mais baixos, \u00e1reas de transfer\u00eancia espec\u00edficas mais altas e taxas de transfer\u00eancia mais altas.\u00a0Apesar dessas vantagens, os condensadores de jato n\u00e3o s\u00e3o comuns em usinas termel\u00e9tricas, principalmente devido \u00e0\u00a0<\/span><strong><span>perda de condensado<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20933 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min-185x300.png\" alt=\"condensa\u00e7\u00e3o de filme\" width=\"185\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min-185x300.png\" \/><\/a><span>___________<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20932 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min-162x300.png\" alt=\"condensa\u00e7\u00e3o gota a gota\" width=\"162\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min-162x300.png\" \/><\/a><\/p>\n<p><span>___________<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20934\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min-150x300.png\" alt=\"condensa\u00e7\u00e3o de contato direto\" width=\"150\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min-150x300.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>Condensa\u00e7\u00e3o em Usinas &#8211; Condensador Principal<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Condenser-LP-Heaters-Deaerator-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-17843 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Condenser-LP-Heaters-Deaerator-min-300x146.png\" alt=\"Condensador - Aquecedores de LP - Desaerador\" width=\"300\" height=\"146\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Condenser-LP-Heaters-Deaerator-min-300x146.png\" \/><\/a><span>O sistema\u00a0\u00a0<\/span><a title=\"Condensador Principal - Condensador a Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/\"><strong><span>principal do condensador de vapor<\/span><\/strong><\/a><span>\u00a0\u00a0(MC) foi projetado para\u00a0\u00a0<\/span><strong><span>condensar<\/span><\/strong><span>\u00a0\u00a0e\u00a0\u00a0<\/span><strong><span>desaerar<\/span><\/strong><span>\u00a0\u00a0o vapor de exaust\u00e3o da turbina principal e fornecer um dissipador de calor para o sistema de desvio da turbina.\u00a0O vapor exaurido das turbinas LP \u00e9 condensado passando por tubos que cont\u00eam \u00e1gua do sistema de resfriamento.\u00a0Existe uma unidade condensadora principal sob\u00a0\u00a0<\/span><strong><span>cada\u00a0\u00a0<\/span><a title=\"Turbina LP - Turbina a vapor de baixa press\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/what-is-steam-turbine-description-and-characteristics\/lp-turbine-low-pressure-steam-turbine\/\"><span>turbina LP<\/span><\/a><\/strong><span>\u00a0, geralmente abaixo da turbina com seu eixo perpendicular ao eixo da turbina.\u00a0Como as usinas nucleares geralmente cont\u00eam tamb\u00e9m um condensador auxiliar (por exemplo, para condensar o vapor de bombas de \u00e1gua de alimenta\u00e7\u00e3o movidas a vapor), os engenheiros usam o termo &#8221;\u00a0<\/span><strong><span>condensador principal<\/span><\/strong><span>\u00a0&#8220;.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><strong><a title=\"Condensador Principal - Condensador a Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/\"><span>Condensador principal<\/span><\/a><\/strong><\/p>\n<p><span>O condensador deve manter um v\u00e1cuo baixo suficiente para aumentar a efici\u00eancia da usina.\u00a0As bombas de v\u00e1cuo mant\u00eam um v\u00e1cuo suficiente no condensador, extraindo ar e gases n\u00e3o condensados.\u00a0A menor press\u00e3o vi\u00e1vel do condensador \u00e9 a\u00a0\u00a0\u00a0press\u00e3o de\u00a0<\/span><a title=\"Satura\u00e7\u00e3o - Ponto de Ebuli\u00e7\u00e3o\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-saturacao-ponto-de-ebulicao-definicao\/\"><span>satura\u00e7\u00e3o<\/span><\/a><span>\u00a0correspondente \u00e0 temperatura ambiente (por exemplo, press\u00e3o absoluta de\u00a0\u00a0<\/span><strong><span>0,008 MPa,\u00a0<\/span><\/strong><span>\u00a0que corresponde a\u00a0<\/span><strong><span>\u00a041,5 \u00b0 C<\/span><\/strong><span>\u00a0).\u00a0Observe que sempre h\u00e1 uma diferen\u00e7a de temperatura entre (em torno de\u00a0\u00a0<\/span><strong><span>\u0394T = 14 \u00b0 C<\/span><\/strong><span>) a temperatura do condensador e a temperatura ambiente, que se originam do tamanho finito e da efici\u00eancia dos condensadores.\u00a0Como nem o condensador \u00e9 um trocador de calor 100% eficiente, sempre h\u00e1 uma diferen\u00e7a de temperatura entre a temperatura de satura\u00e7\u00e3o (lado secund\u00e1rio) e a temperatura do l\u00edquido de arrefecimento no sistema de refrigera\u00e7\u00e3o.\u00a0Al\u00e9m disso, h\u00e1 uma inefici\u00eancia de projeto, que diminui a efici\u00eancia geral da turbina.\u00a0Idealmente, o vapor descarregado no condensador n\u00e3o teria\u00a0\u00a0<\/span><strong><span>sub-resfriamento<\/span><\/strong><span>\u00a0.\u00a0Mas os condensadores reais s\u00e3o projetados para sub-resfriar o l\u00edquido em alguns graus Celsius, a fim de evitar a\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/centrifugal-pumps\/cavitation\/suction-cavitation\/\"><strong><span>cavita\u00e7\u00e3o de suc\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0\u00a0nas bombas de condensado.<\/span><\/p>\n<p><span>Os\u00a0\u00a0<\/span><strong><span>condensadores de vapor<\/span><\/strong><span>\u00a0\u00a0s\u00e3o amplamente classificados em dois tipos:<\/span><\/p>\n<ul>\n<li><a title=\"Condensador de superf\u00edcie e Condensador a jato\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/surface-condenser-and-jet-condenser\/\"><strong><span>Condensadores de superf\u00edcie<\/span><\/strong><\/a><span>\u00a0\u00a0(ou condensadores do tipo sem mistura).\u00a0Nos condensadores de superf\u00edcie, n\u00e3o h\u00e1 contato direto entre o vapor de exaust\u00e3o e a \u00e1gua de resfriamento.<\/span><\/li>\n<li><a title=\"Condensador de superf\u00edcie e Condensador a jato\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/surface-condenser-and-jet-condenser\/\"><strong><span>Condensadores a jato<\/span><\/strong><\/a><span>\u00a0\u00a0(ou condensadores do tipo mistura).\u00a0Nos condensadores a jato, h\u00e1 contato direto entre o vapor de exaust\u00e3o e a \u00e1gua de resfriamento.<\/span><\/li>\n<\/ul>\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><span>Condensa\u00e7\u00e3o no pressurizador<\/span><\/h2>\n<figure id=\"attachment_16538\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16538\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Extensive-vs.-Intensive-properties-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16538 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Extensive-vs.-Intensive-properties-min-238x300.png\" alt=\"Propriedades termodin\u00e2micas extensas vs. intensivas\" width=\"238\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Extensive-vs.-Intensive-properties-min-238x300.png\" \/><\/a><figcaption id=\"caption-attachment-16538\" class=\"wp-caption-text\"><span>Propriedades extensivas e intensivas do meio no pressurizador.<\/span><\/figcaption><\/figure>\n<p><span>Um\u00a0\u00a0<\/span><a title=\"Pressurizador\" href=\"https:\/\/www.nuclear-power.com\/pressurizer\/\"><strong><span>pressurizador<\/span><\/strong><\/a><span>\u00a0\u00a0\u00e9 um componente de um\u00a0\u00a0<\/span><a title=\"PWR - Reator de \u00e1gua pressurizada\" href=\"https:\/\/www.nuclear-power.com\/pwr-pressurized-water-reactor\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span>reator de \u00e1gua pressurizada<\/span><\/a><span>\u00a0.\u00a0<\/span><strong><span>A press\u00e3o no circuito prim\u00e1rio\u00a0<\/span><\/strong><span>\u00a0dos PWRs \u00e9 mantida por um\u00a0\u00a0<\/span><strong><span>pressurizador<\/span><\/strong><span>\u00a0, um vaso separado que \u00e9 conectado ao circuito prim\u00e1rio (perna quente) e parcialmente preenchido com \u00e1gua que \u00e9 aquecida at\u00e9 a\u00a0\u00a0<\/span><strong><span>temperatura de satura\u00e7\u00e3o<\/span><\/strong><span>\u00a0\u00a0(ponto de ebuli\u00e7\u00e3o) para a press\u00e3o desejada por\u00a0<strong>energia el\u00e9trica<\/strong>\u00a0submersa.\u00a0\u00a0<\/span><strong><span>aquecedores<\/span><\/strong><span>.\u00a0A temperatura no pressurizador pode ser mantida a 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.\u00a0O projeto b\u00e1sico do\u00a0\u00a0<\/span><strong><span>reator de \u00e1gua pressurizada\u00a0<\/span><\/strong><span>\u00a0inclui tal requisito que o l\u00edquido de refrigera\u00e7\u00e3o (\u00e1gua) no sistema de refrigera\u00e7\u00e3o do reator n\u00e3o deve ferver.\u00a0Para conseguir isso, o l\u00edquido de refrigera\u00e7\u00e3o no sistema de refrigera\u00e7\u00e3o do reator \u00e9 mantido a uma press\u00e3o suficientemente alta para que a ebuli\u00e7\u00e3o n\u00e3o ocorra nas temperaturas do l\u00edquido de refrigera\u00e7\u00e3o experimentadas enquanto a planta est\u00e1 em opera\u00e7\u00e3o ou em um transiente analisado.<\/span><\/p>\n<h2><span id=\"Functions\"><span>Fun\u00e7\u00f5es<\/span><\/span><\/h2>\n<p><strong><span>A press\u00e3o<\/span><\/strong><span>\u00a0\u00a0no pressurizador \u00e9 controlada variando a temperatura do l\u00edquido de refrigera\u00e7\u00e3o no pressurizador.\u00a0Para esses fins, dois sistemas est\u00e3o instalados.\u00a0<\/span><strong><span>Sistema de pulveriza\u00e7\u00e3o de \u00e1gua<\/span><\/strong><span>\u00a0\u00a0e\u00a0\u00a0<\/span><strong><span>sistema de aquecimento el\u00e9trico<\/span><\/strong><span>\u00a0.\u00a0O volume do pressurizador (dezenas de metros c\u00fabicos) \u00e9 preenchido com \u00e1gua nos par\u00e2metros de satura\u00e7\u00e3o e vapor.\u00a0O sistema de pulveriza\u00e7\u00e3o de \u00e1gua (\u00e1gua relativamente fria &#8211; da perna fria) pode diminuir a press\u00e3o no recipiente,\u00a0\u00a0<\/span><strong><span>condensando o vapor\u00a0<\/span><\/strong><span>\u00a0nas gotas de \u00e1gua pulverizadas no recipiente.\u00a0Como o vapor entra em contato com um l\u00edquido frio, neste caso, estamos falando de\u00a0<\/span><strong><span>condensa\u00e7\u00e3o de contato direto<\/span><\/strong><span>\u00a0.\u00a0Por outro lado, os aquecedores el\u00e9tricos submersos s\u00e3o projetados para aumentar a press\u00e3o por\u00a0\u00a0<\/span><strong><span>evapora\u00e7\u00e3o da \u00e1gua<\/span><\/strong><span>\u00a0no navio.\u00a0A press\u00e3o da \u00e1gua em um sistema fechado rastreia a temperatura da \u00e1gua diretamente;\u00a0conforme a temperatura aumenta, a press\u00e3o aumenta.<\/span><\/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>Condensa\u00e7\u00e3o no edif\u00edcio de conten\u00e7\u00e3o<\/span><\/h2>\n<p><span>No caso de acidentes de base do projeto, como o LBLOCA, o aumento de press\u00e3o \u00e9 geralmente significativo e sistemas de conten\u00e7\u00e3o ativos (sistemas\u00a0<\/span><strong><span>de supress\u00e3o de press\u00e3o<\/span><\/strong><span>\u00a0) devem estar dispon\u00edveis para manter a integridade (para manter a press\u00e3o e a temperatura). sob certos limites) do\u00a0<\/span><a title=\"Constru\u00e7\u00e3o de conten\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/containment-building\/\"><strong><span>edif\u00edcio de conten\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<p><strong><span>Os sistemas de supress\u00e3o de press\u00e3o<\/span><\/strong><span>\u00a0\u00a0s\u00e3o cr\u00edticos para a seguran\u00e7a e afetam bastante o tamanho da conten\u00e7\u00e3o.\u00a0Supress\u00e3o refere-se \u00e0\u00a0\u00a0<\/span><strong><span>condensa\u00e7\u00e3o do vapor<\/span><\/strong><span>\u00a0ap\u00f3s uma grande quebra libert\u00e1-lo do sistema de resfriamento.\u00a0Existem muitos projetos de sistemas de supress\u00e3o em todo o mundo.<\/span><\/p>\n<p><strong><span>A maioria das\u00a0\u00a0\u00a0conten\u00e7\u00f5es de\u00a0<\/span><a title=\"PWR - Reator de \u00e1gua pressurizada\" href=\"https:\/\/www.nuclear-power.com\/pwr-pressurized-water-reactor\/\"><span>reatores de \u00e1gua pressurizada (PWRs)<\/span><\/a><span>\u00a0usa sistemas de supress\u00e3o de press\u00e3o em dois est\u00e1gios:<\/span><\/strong><\/p>\n<ul>\n<li><strong><span>Sistema de refrigera\u00e7\u00e3o do ventilador<\/span><\/strong><span>\u00a0.\u00a0Este sistema circula o ar atrav\u00e9s de trocadores de calor e filtros para fornecer o resfriamento da atmosfera de conten\u00e7\u00e3o.\u00a0Como esse sistema n\u00e3o \u00e9 suficiente para a supress\u00e3o durante graves perdas de acidentes com l\u00edquido de arrefecimento, o sistema de pulveriza\u00e7\u00e3o de conten\u00e7\u00e3o deve estar dispon\u00edvel como sistema ativo secund\u00e1rio de supress\u00e3o de press\u00e3o.<\/span><\/li>\n<li><strong><span>Sistema de pulveriza\u00e7\u00e3o de conten\u00e7\u00e3o<\/span><\/strong><span>\u00a0.\u00a0Este sistema geralmente consiste em tr\u00eas elementos:<\/span>\n<ul>\n<li><span>Bomba do sistema de pulveriza\u00e7\u00e3o<\/span><\/li>\n<li><span>Tanque do sistema de pulveriza\u00e7\u00e3o<\/span><\/li>\n<li><span>An\u00e9is e bocais do sistema de pulveriza\u00e7\u00e3o<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span>Quando o aumento de press\u00e3o dentro do confinamento \u00e9 indicado, o sistema de pulveriza\u00e7\u00e3o de conten\u00e7\u00e3o \u00e9 iniciado automaticamente e as bombas (geralmente com redund\u00e2ncia de 3 \u00d7 100%) aspiram o tanque (o tanque de armazenamento de \u00e1gua para reabastecimento tamb\u00e9m pode ser usado) e bombeiam a \u00e1gua para os bicos de pulveriza\u00e7\u00e3o localizado na parte superior do confinamento.\u00a0As gotas de \u00e1gua, sendo mais frias que o vapor, remover\u00e3o o calor do vapor, o que far\u00e1 com que o vapor se condense.\u00a0Isso causar\u00e1 uma redu\u00e7\u00e3o na press\u00e3o do edif\u00edcio e tamb\u00e9m reduzir\u00e1 a temperatura da atmosfera de conten\u00e7\u00e3o.\u00a0O sistema de pulveriza\u00e7\u00e3o geralmente cont\u00e9m aditivos qu\u00edmicos extras dissolvidos no tanque para melhorar a remo\u00e7\u00e3o de radionucl\u00eddeos espec\u00edficos da atmosfera de conten\u00e7\u00e3o.\u00a0Especialmente o radioiodo, que \u00e9 de particular import\u00e2ncia,<\/span><\/p>\n<p><span>A maioria das\u00a0\u00a0\u00a0conten\u00e7\u00f5es de\u00a0<\/span><a title=\"BWR - Reator de \u00e1gua fervente\" href=\"https:\/\/www.nuclear-power.com\/bwr-boiling-water-reactor\/\"><span>reatores de \u00e1gua fervente (\u00a0<\/span><\/a><a title=\"BWR - Reator de \u00e1gua fervente\" href=\"https:\/\/www.nuclear-power.com\/bwr-boiling-water-reactor\/\"><span>BWR)<\/span><\/a><span>\u00a0usa piscinas de supress\u00e3o de press\u00e3o para manter a integridade do edif\u00edcio de conten\u00e7\u00e3o.\u00a0Os principais desenhos de conten\u00e7\u00e3o s\u00e3o o Mark I, Mark II e o Mark III.\u00a0As conten\u00e7\u00f5es Mark I e Mark II consistem em duas partes principais:<\/span><\/p>\n<ul>\n<li><strong><span>Drywell<\/span><\/strong><span>\u00a0.\u00a0Um po\u00e7o seco abriga o sistema de refrigera\u00e7\u00e3o do reator.<\/span><\/li>\n<li><strong><span>Wetwell<\/span><\/strong><span>\u00a0.\u00a0Um po\u00e7o \u00famido \u00e9 uma c\u00e2mara de supress\u00e3o, que armazena uma grande quantidade de \u00e1gua e, portanto, \u00e9 comumente chamada de piscina de supress\u00e3o.<\/span><\/li>\n<\/ul>\n<p><span>Os sistemas de pulveriza\u00e7\u00e3o de \u00e1gua s\u00e3o geralmente instalados no po\u00e7o seco e no po\u00e7o \u00famido.\u00a0O projeto Mark III consiste em uma conten\u00e7\u00e3o prim\u00e1ria e um po\u00e7o seco.<\/span><\/p>\n<p><span>Os edif\u00edcios de conten\u00e7\u00e3o e os sistemas de supress\u00e3o de press\u00e3o de conten\u00e7\u00e3o variam muito, dependendo do projeto de certos reatores.\u00a0Em alguns casos, tecnologias realmente \u00fanicas podem ser instaladas.\u00a0Por exemplo, o pr\u00e9dio de conten\u00e7\u00e3o da Loviisa NPP usa dois condensadores de gelo como sistema de supress\u00e3o de press\u00e3o.<\/span><\/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-accordion\">\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","protected":false},"excerpt":{"rendered":"<p>Condensa\u00e7\u00e3o \u00e9 a mudan\u00e7a do estado f\u00edsico da mat\u00e9ria da fase gasosa para a fase l\u00edquida e \u00e9 o inverso da vaporiza\u00e7\u00e3o.\u00a0Condensa\u00e7\u00e3o &#8211; Transfer\u00eancia de Calor Condensa\u00e7\u00e3o Diagrama de fases da \u00e1gua. Fonte: wikipedia.org CC BY-SA Da mesma forma que no cap\u00edtulo anterior, neste cap\u00edtulo, discutiremos a transfer\u00eancia de calor com a mudan\u00e7a de fase, &#8230; <a title=\"O que \u00e9 Condensa\u00e7\u00e3o &#8211; Transfer\u00eancia de Calor &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condensacao-transferencia-de-calor-definicao\/\" aria-label=\"More on O que \u00e9 Condensa\u00e7\u00e3o &#8211; Transfer\u00eancia de Calor &#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 Condensa\u00e7\u00e3o - Transfer\u00eancia de Calor - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Condensa\u00e7\u00e3o \u00e9 a mudan\u00e7a do estado f\u00edsico da mat\u00e9ria da fase gasosa para a fase l\u00edquida e \u00e9 o inverso da vaporiza\u00e7\u00e3o. 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