{"id":46893,"date":"2019-11-02T12:24:49","date_gmt":"2019-11-02T11:24:49","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/"},"modified":"2020-01-22T09:38:35","modified_gmt":"2020-01-22T08:38:35","slug":"o-que-e-isolamento-de-parede-de-cavidade-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/","title":{"rendered":"O que \u00e9 isolamento de parede de cavidade &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O isolamento da parede da cavidade \u00e9 um m\u00e9todo de isolamento t\u00e9rmico usado para reduzir a perda de calor atrav\u00e9s de uma parede da cavidade, preenchendo o espa\u00e7o a\u00e9reo com isolador t\u00e9rmico.\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>Isolamento de cavidade de parede<\/h2>\n<p><strong>O isolamento da parede da cavidade<\/strong>\u00a0\u00e9 um m\u00e9todo de isolamento t\u00e9rmico usado para reduzir a perda de calor atrav\u00e9s de uma parede da cavidade, preenchendo o espa\u00e7o a\u00e9reo com isolador t\u00e9rmico.\u00a0Esses materiais (por exemplo,\u00a0<a title=\"Espuma de poliuretano\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/polyurethane-foam\/\">poliuretano<\/a>\u00a0) funcionam simplesmente com um grande n\u00famero de\u00a0<strong>bolsas cheias<\/strong>\u00a0de\u00a0<strong>g\u00e1s<\/strong>\u00a0que\u00a0<strong>impedem a convec\u00e7\u00e3o em grande escala<\/strong>\u00a0.\u00a0A altern\u00e2ncia de bolsa de g\u00e1s e material s\u00f3lido faz com que o calor seja transferido atrav\u00e9s de muitas interfaces, causando uma r\u00e1pida diminui\u00e7\u00e3o no coeficiente de transfer\u00eancia de calor.<\/p>\n<p>Durante a constru\u00e7\u00e3o de novos edif\u00edcios, as cavidades s\u00e3o frequentemente preenchidas com pain\u00e9is de l\u00e3 de vidro ou l\u00e3 de rocha, colocados entre as duas folhas (laterais) da parede.\u00a0A espuma de poliuretano (PUR) \u00e9 um pol\u00edmero termoest\u00e1vel de c\u00e9lula fechada.\u00a0O isolamento de espuma de poliuretano est\u00e1 dispon\u00edvel nas f\u00f3rmulas de c\u00e9lulas fechadas e de c\u00e9lulas abertas.\u00a0A espuma de poliuretano pode ser usada como isolamento de paredes de cavidades ou como isolamento de telhado, isolamento de piso, isolamento de tubos, isolamento de instala\u00e7\u00f5es industriais.\u00a0Pain\u00e9is de isolamento feitos de PUR podem ser aplicados a todos os elementos do inv\u00f3lucro do edif\u00edcio.\u00a0Outro aspecto importante \u00e9 que o PUR tamb\u00e9m pode ser injetado nas paredes existentes, usando as aberturas existentes e alguns furos extras.<\/p>\n<p>Para edif\u00edcios existentes que n\u00e3o foram constru\u00eddos com cavidades isoladas, um material fibroso, como isolamento de celulose ou l\u00e3 de vidro, \u00e9 soprado na cavidade atrav\u00e9s de orif\u00edcios adequados at\u00e9 preencher todo o espa\u00e7o da parede.\u00a0<a title=\"Isolamento por sopro e preenchimento solto\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/building-insulation-home-insulation\/attic-insulation-roof-insulation\/blown-in-and-loose-fill-insulation\/\">O isolamento de preenchimento solto<\/a>\u00a0consiste em pequenas part\u00edculas de fibra, espuma ou outros materiais.\u00a0Os tipos mais comuns de materiais usados \u200b\u200bpara isolamento a granel incluem\u00a0<a title=\"Isolamento de Celulose - L\u00e3 de Papel\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/cellulose-insulation-paper-wool\/\">celulose<\/a>\u00a0,\u00a0<a title=\"L\u00e3 de vidro\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/glass-wool\/\">l\u00e3 de vidro<\/a>\u00a0e\u00a0<a title=\"L\u00e3 de Pedra - L\u00e3 de Rocha\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/stone-wool-rock-wool\/\">l\u00e3 de rocha<\/a>\u00a0.<\/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>Isolamento por sopro e preenchimento solto<\/h2>\n<p><strong>Materiais soltos<\/strong>\u00a0podem ser soprados em\u00a0<strong>s\u00f3t\u00e3os<\/strong>\u00a0e\u00a0<strong>cavidades de parede acabadas<\/strong>\u00a0.\u00a0Para edif\u00edcios existentes que n\u00e3o foram constru\u00eddos com cavidades isoladas, um material fibroso, como isolamento de celulose ou l\u00e3 de vidro, \u00e9 soprado na cavidade atrav\u00e9s de orif\u00edcios adequados at\u00e9 preencher todo o espa\u00e7o da parede.\u00a0<strong>O isolamento de preenchimento solto<\/strong>\u00a0consiste em pequenas part\u00edculas de fibra, espuma ou outros materiais.\u00a0Os tipos mais comuns de materiais usados \u200b\u200bpara isolamento a granel incluem celulose, l\u00e3 de vidro e l\u00e3 de rocha.<\/p>\n<ul>\n<li><a title=\"Isolamento de Celulose - L\u00e3 de Papel\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/cellulose-insulation-paper-wool\/\"><strong>O isolamento da celulose<\/strong><\/a>\u00a0\u00e9 feito de produtos de papel reciclado, principalmente jornais e tem um conte\u00fado muito alto de material reciclado.<\/li>\n<li><a title=\"L\u00e3 de vidro\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/glass-wool\/\"><strong>A l\u00e3 de vidro<\/strong><\/a>\u00a0(originalmente tamb\u00e9m conhecida como fibra de vidro) \u00e9 um material isolante feito de fibras de vidro dispostas usando um aglutinante em uma textura semelhante \u00e0 l\u00e3.<\/li>\n<li><strong><a title=\"L\u00e3 de Pedra - L\u00e3 de Rocha\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/stone-wool-rock-wool\/\">A l\u00e3 de pedra<\/a>\u00a0,<\/strong>\u00a0tamb\u00e9m conhecida como<strong>\u00a0l\u00e3 de rocha,<\/strong>\u00a0\u00e9 baseada em minerais naturais presentes em grandes quantidades em toda a terra, por exemplo, rochas vulc\u00e2nicas, tipicamente basalto ou dolomita.<\/li>\n<\/ul>\n<p>Essas pequenas part\u00edculas feitas com esses materiais formam um material para isolamento que pode se adaptar a qualquer espa\u00e7o sem perturbar estruturas ou acabamentos.\u00a0Um dos m\u00e9todos \u00e9 o isolamento de celulose por spray \u00famido.\u00a0Esse tipo de isolamento \u00e9 semelhante ao isolamento de preenchimento a granel, mas \u00e9 aplicado com uma pequena quantidade de \u00e1gua para ajudar a celulose a se ligar ao interior das cavidades das paredes abertas.<\/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<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>Exemplo de Isolamento &#8211; Isolamento de Celulose<\/span><\/h2>\n<p><span>O isolamento da celulose \u00e9 feito de produtos de papel reciclado, principalmente jornais e tem um conte\u00fado muito alto de material reciclado.\u00a0As fibras de celulose obtidas t\u00eam uma estrutura semelhante a l\u00e3 (portanto l\u00e3 de papel).\u00a0Para tornar as fibras de celulose \u00famidas e retardantes de chamas, s\u00e3o adicionados \u00e1cido b\u00f3rico ou sulfato de am\u00f4nio.\u00a0O isolamento de celulose \u00e9 usado nas cavidades da parede e do telhado para isolar, \u00e0 prova de correntes de ar e reduzir o ru\u00eddo livre.\u00a0O isolamento de celulose \u00e9 usado em resid\u00eancias novas e existentes, geralmente como aterramento em instala\u00e7\u00f5es de s\u00f3t\u00e3o aberto e denso em cavidades de edif\u00edcios.\u00a0A celulose e outros materiais de preenchimento solto podem ser levados para s\u00f3t\u00e3os, cavidades de paredes acabadas e \u00e1reas de dif\u00edcil acesso.<\/span><\/p>\n<p><strong><span>Os valores t\u00edpicos de condutividade t\u00e9rmica<\/span><\/strong><span>\u00a0\u00a0para o\u00a0\u00a0<\/span><strong><span>isolamento de celulose<\/span><\/strong><span>\u00a0\u00a0est\u00e3o entre\u00a0\u00a0<\/span><strong><span>0,022 e 0.035W \/ m \u2219 K<\/span><\/strong><span>\u00a0.<\/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>Exemplo &#8211; Perda de calor atrav\u00e9s de uma parede<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-21148 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation-169x300.png\" alt=\"perda de calor atrav\u00e9s da parede - exemplo - c\u00e1lculo\" width=\"169\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation-169x300.png\" \/><\/a><span>Uma das principais fontes de\u00a0<\/span><strong><span>perda<\/span><\/strong><span>\u00a0de\u00a0<strong>calor<\/strong>\u00a0de uma casa \u00e9 atrav\u00e9s das paredes.\u00a0Calcule a taxa de\u00a0<\/span><a title=\"Densidade do fluxo de calor - Fluxo t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-flux-density-thermal-flux\/\"><span>fluxo<\/span><\/a><span>\u00a0de\u00a0<a title=\"Densidade do fluxo de calor - Fluxo t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-flux-density-thermal-flux\/\">calor<\/a>\u00a0atrav\u00e9s de uma parede com 3 mx 10 m de \u00e1rea (A = 30 m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0).\u00a0A parede tem 15 cm de espessura (L\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0) e \u00e9 feita de tijolos com\u00a0<\/span><a title=\"Condutividade t\u00e9rmica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condutividade-termica-definicao\/\"><span>condutividade t\u00e9rmica<\/span><\/a><span>\u00a0de k\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0= 1,0 W \/ mK (isolador t\u00e9rmico ruim).\u00a0Suponha que as\u00a0<\/span><a title=\"O que \u00e9 temperatura - F\u00edsica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-temperatura-fisica-definicao\/\"><span>temperaturas<\/span><\/a><span>\u00a0interna e externa\u00a0sejam 22 \u00b0 C e -8 \u00b0 C, e os\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\/\"><span>coeficientes de transfer\u00eancia de calor por convec\u00e7\u00e3o<\/span><\/a><span>\u00a0nos lados interno e externo sejam h\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0= 10 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K e h\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0= 30 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>K, respectivamente.\u00a0Observe que esses coeficientes de convec\u00e7\u00e3o dependem muito das condi\u00e7\u00f5es ambientais e interiores (vento, umidade etc.).<\/span><\/p>\n<ol>\n<li><span>Calcule o fluxo de calor (\u00a0<\/span><a title=\"Perdas de calor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/\"><strong><span>perda de calor<\/span><\/strong><\/a><span>\u00a0) atrav\u00e9s desta parede n\u00e3o isolada.<\/span><\/li>\n<li><span>Agora assuma o\u00a0<\/span><strong><span>isolamento t\u00e9rmico<\/span><\/strong><span>\u00a0no lado externo desta parede.\u00a0Use\u00a0<\/span><strong><span>um\u00a0<\/span><\/strong><strong><span>\u00a0isolamento de l\u00e3 de\u00a0<\/span><\/strong><span><strong>vidro com<\/strong>\u00a010 cm de espessura (L\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0) com a condutividade t\u00e9rmica de k\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0= 0,023 W \/ mK e calcule o fluxo de\u00a0<\/span><a title=\"Perdas de calor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/\"><strong><span>calor<\/span><\/strong><\/a><span>\u00a0(\u00a0<a title=\"Perdas de calor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/\"><strong>perda de calor<\/strong><\/a>\u00a0) atrav\u00e9s dessa parede composta.<\/span><\/li>\n<\/ol>\n<p><strong><span>Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><span>Como foi escrito, muitos dos processos de transfer\u00eancia de calor envolvem sistemas compostos e at\u00e9 envolvem uma combina\u00e7\u00e3o de\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-conducao-termica-conducao-termica-definicao\/\"><span>condu\u00e7\u00e3o<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-conveccao-transferencia-de-calor-por-conveccao-definicao\/\"><span>convec\u00e7\u00e3o<\/span><\/a><span>\u00a0.\u00a0Com estes sistemas compostos, muitas vezes \u00e9 conveniente trabalhar com um\u00a0<\/span><strong><a title=\"Coeficiente geral de transfer\u00eancia de calor - fator U\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-coeficiente-geral-de-transferencia-de-calor-fator-u-definicao\/\"><span>coeficiente de transfer\u00eancia total de calor<\/span><\/a><span>\u00a0,<\/span><\/strong><span>\u00a0conhecido como um\u00a0<\/span><strong><span>factor-L<\/span><\/strong><span>\u00a0.\u00a0O fator U \u00e9 definido por uma express\u00e3o an\u00e1loga \u00e0\u00a0<\/span><a title=\"Lei de Newton de resfriamento\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-lei-do-resfriamento-de-newton-definicao\/\"><strong><span>lei do resfriamento de Newton<\/span><\/strong><\/a><span>\u00a0:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/u-factor-overall-heat-transfer-coefficient.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20390 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/u-factor-overall-heat-transfer-coefficient.png\" alt=\"fator u - coeficiente geral de transfer\u00eancia de calor\" width=\"314\" height=\"136\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/u-factor-overall-heat-transfer-coefficient.png\" \/><\/a><\/p>\n<p><span>O\u00a0<\/span><strong><span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0est\u00e1 relacionado \u00e0\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-resistencia-termica-resistividade-termica-definicao\/\"><span>resist\u00eancia t\u00e9rmica total<\/span><\/a><span>\u00a0e depende da geometria do problema.<\/span><\/p>\n<ol>\n<li><strong><span>parede nua<\/span><\/strong><\/li>\n<\/ol>\n<p><span>Assumindo a transfer\u00eancia de calor unidimensional atrav\u00e9s da parede plana e desconsiderando a radia\u00e7\u00e3o, o\u00a0<\/span><strong><span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0pode ser calculado como:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-heat-loss-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-21160 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-heat-loss-calculation.png\" alt=\"coeficiente geral de transfer\u00eancia de calor - c\u00e1lculo da perda de calor\" width=\"343\" height=\"200\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-heat-loss-calculation.png\" \/><\/a><\/p>\n<p><span>O\u00a0<\/span><strong><span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0\u00e9 ent\u00e3o:<\/span><\/p>\n<p><span>U = 1 \/ (1\/10 + 0,15 \/ 1 + 1\/30) = 3,53 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K<\/span><\/p>\n<p><span>O fluxo de calor pode ser calculado simplesmente como:<\/span><\/p>\n<p><span>q = 3,53 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K] x 30 [K] = 105,9 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/p>\n<p><span>A perda total de calor atrav\u00e9s desta parede ser\u00e1:<\/span><\/p>\n<p><span>q\u00a0<\/span><sub><span>perda<\/span><\/sub><span>\u00a0= q.\u00a0A = 105,9 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] x 30 [m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] = 3177W<\/span><\/p>\n<ol start=\"2\">\n<li><strong><span>parede comp\u00f3sita com isolamento t\u00e9rmico<\/span><\/strong><\/li>\n<\/ol>\n<p><span>Assumindo a transfer\u00eancia de calor unidimensional atrav\u00e9s da parede composta plana, sem resist\u00eancia ao contato t\u00e9rmico e sem considerar a radia\u00e7\u00e3o, o\u00a0<\/span><strong><span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0pode ser calculado como:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-thermal-insulation-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-21159 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-thermal-insulation-calculation.png\" alt=\"coeficiente geral de transfer\u00eancia de calor - c\u00e1lculo de isolamento t\u00e9rmico\" width=\"423\" height=\"211\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-thermal-insulation-calculation.png\" \/><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/example-glass-wool-insulation.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-21229 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/example-glass-wool-insulation-169x300.png\" alt=\"isolamento de l\u00e3 de vidro\" width=\"169\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/example-glass-wool-insulation-169x300.png\" \/><\/a><span>O\u00a0<\/span><strong><span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0\u00e9 ent\u00e3o:<\/span><\/p>\n<p><span>U = 1 \/ (1\/10 + 0,15 \/ 1 + 0,1 \/ 0,023 + 1\/30) = 0,216 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K<\/span><\/p>\n<p><span>O fluxo de calor pode ser calculado simplesmente como:<\/span><\/p>\n<p><span>q = 0,216 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K] x 30 [K] = 6,48 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/p>\n<p><span>A perda total de calor atrav\u00e9s desta parede ser\u00e1:<\/span><\/p>\n<p><span>q\u00a0<\/span><sub><span>perda<\/span><\/sub><span>\u00a0= q.\u00a0A = 6,48 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] x 30 [m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] = 194 W<\/span><\/p>\n<p><span>Como pode ser visto, uma adi\u00e7\u00e3o de isolador t\u00e9rmico causa uma diminui\u00e7\u00e3o significativa nas perdas de calor.\u00a0Deve ser adicionado, uma adi\u00e7\u00e3o da pr\u00f3xima camada de isolador t\u00e9rmico n\u00e3o causa economias t\u00e3o altas.\u00a0Isso pode ser visto melhor no m\u00e9todo de resist\u00eancia t\u00e9rmica, que pode ser usado para calcular a transfer\u00eancia de calor atrav\u00e9s de\u00a0<\/span><strong><span>paredes compostas<\/span><\/strong><span>\u00a0.\u00a0A taxa de transfer\u00eancia constante de calor entre duas superf\u00edcies \u00e9 igual \u00e0 diferen\u00e7a de temperatura dividida pela\u00a0<\/span><a title=\"Resist\u00eancia t\u00e9rmica - Resistividade t\u00e9rmica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-resistencia-termica-resistividade-termica-definicao\/\"><span>resist\u00eancia t\u00e9rmica<\/span><\/a><span>\u00a0total\u00a0entre essas duas superf\u00edcies.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-resistance-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20128 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-resistance-equation.png\" alt=\"resist\u00eancia t\u00e9rmica - equa\u00e7\u00e3o\" width=\"601\" height=\"73\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-resistance-equation.png\" \/><\/a><\/p>\n<\/div>\n<\/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","protected":false},"excerpt":{"rendered":"<p>O isolamento da parede da cavidade \u00e9 um m\u00e9todo de isolamento t\u00e9rmico usado para reduzir a perda de calor atrav\u00e9s de uma parede da cavidade, preenchendo o espa\u00e7o a\u00e9reo com isolador t\u00e9rmico.\u00a0Engenharia T\u00e9rmica Isolamento de cavidade de parede O isolamento da parede da cavidade\u00a0\u00e9 um m\u00e9todo de isolamento t\u00e9rmico usado para reduzir a perda de &#8230; <a title=\"O que \u00e9 isolamento de parede de cavidade &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/\" aria-label=\"More on O que \u00e9 isolamento de parede de cavidade &#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 isolamento de parede de cavidade - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O isolamento da parede da cavidade \u00e9 um m\u00e9todo de isolamento t\u00e9rmico usado para reduzir a perda de calor atrav\u00e9s de uma parede da cavidade, preenchendo o espa\u00e7o a\u00e9reo com isolador t\u00e9rmico. Engenharia T\u00e9rmica\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que \u00e9 isolamento de parede de cavidade - Defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"O isolamento da parede da cavidade \u00e9 um m\u00e9todo de isolamento t\u00e9rmico usado para reduzir a perda de calor atrav\u00e9s de uma parede da cavidade, preenchendo o espa\u00e7o a\u00e9reo com isolador t\u00e9rmico. Engenharia T\u00e9rmica\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/\" \/>\n<meta property=\"og:site_name\" content=\"Thermal Engineering\" \/>\n<meta property=\"article:published_time\" content=\"2019-11-02T11:24:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-01-22T08:38:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation-169x300.png\" \/>\n<meta name=\"twitter:card\" content=\"summary\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\">\n\t<meta name=\"twitter:data1\" content=\"Nick Connor\">\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\">\n\t<meta name=\"twitter:data2\" content=\"6 minutos\">\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#website\",\"url\":\"https:\/\/www.thermal-engineering.org\/fr\/\",\"name\":\"Thermal Engineering\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/www.thermal-engineering.org\/fr\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/#primaryimage\",\"inLanguage\":\"pt-BR\",\"url\":\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation-169x300.png\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/#webpage\",\"url\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/\",\"name\":\"O que \\u00e9 isolamento de parede de cavidade - Defini\\u00e7\\u00e3o\",\"isPartOf\":{\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/#primaryimage\"},\"datePublished\":\"2019-11-02T11:24:49+00:00\",\"dateModified\":\"2020-01-22T08:38:35+00:00\",\"author\":{\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\"},\"description\":\"O isolamento da parede da cavidade \\u00e9 um m\\u00e9todo de isolamento t\\u00e9rmico usado para reduzir a perda de calor atrav\\u00e9s de uma parede da cavidade, preenchendo o espa\\u00e7o a\\u00e9reo com isolador t\\u00e9rmico. Engenharia T\\u00e9rmica\",\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-isolamento-de-parede-de-cavidade-definicao\/\"]}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\",\"name\":\"Nick Connor\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#personlogo\",\"inLanguage\":\"pt-BR\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/84c0dec310b44b65da29dc9df6925239?s=96&d=mm&r=g\",\"caption\":\"Nick Connor\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/posts\/46893"}],"collection":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/comments?post=46893"}],"version-history":[{"count":0,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/posts\/46893\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/media?parent=46893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/categories?post=46893"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/tags?post=46893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}