{"id":47004,"date":"2019-11-02T22:28:37","date_gmt":"2019-11-02T21:28:37","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/exemplo-calculo-de-isolamento-de-la-de-vidro-definicao\/"},"modified":"2019-11-02T22:28:37","modified_gmt":"2019-11-02T21:28:37","slug":"exemplo-calculo-de-isolamento-de-la-de-vidro-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/exemplo-calculo-de-isolamento-de-la-de-vidro-definicao\/","title":{"rendered":"Exemplo – C\u00e1lculo de isolamento de l\u00e3 de vidro – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Exemplo – C\u00e1lculo de isolamento de l\u00e3 de vidro.\u00a0Calcule o fluxo de calor (perda de calor) atrav\u00e9s da parede isolada.\u00a0Use isolamento de l\u00e3 de vidro com 10 cm de espessura.\u00a0Compare com uma parede nua.\u00a0Engenharia T\u00e9rmica<\/span><\/div>\n<\/div>\n
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Exemplo – Isolamento de L\u00e3 de Vidro<\/span><\/h2>\n

\"perda<\/a>Uma das principais fontes de\u00a0<\/span>perda<\/span><\/strong>\u00a0de\u00a0calor<\/strong>\u00a0de uma casa \u00e9 atrav\u00e9s das paredes.\u00a0Calcule a taxa de\u00a0<\/span>fluxo<\/span><\/a>\u00a0de\u00a0calor<\/a>\u00a0atrav\u00e9s de uma parede com 3 mx 10 m de \u00e1rea (A = 30 m\u00a0<\/span>2<\/span><\/sup>\u00a0).\u00a0A parede tem 15 cm de espessura (L\u00a0<\/span>1<\/span><\/sub>\u00a0) e \u00e9 feita de tijolos com\u00a0<\/span>condutividade t\u00e9rmica<\/span><\/a>\u00a0de k\u00a0<\/span>1<\/span><\/sub>\u00a0= 1,0 W \/ mK (isolador t\u00e9rmico ruim).\u00a0Suponha que as\u00a0<\/span>temperaturas<\/span><\/a>\u00a0interna e externa\u00a0sejam 22 \u00b0 C e -8 \u00b0 C, e os\u00a0<\/span>coeficientes de transfer\u00eancia de calor por convec\u00e7\u00e3o<\/span><\/a>\u00a0nos lados interno e externo sejam h\u00a0<\/span>1<\/span><\/sub>\u00a0= 10 W \/ m\u00a0<\/span>2<\/span><\/sup>\u00a0K e h\u00a0<\/span>2<\/span><\/sub>\u00a0= 30 W \/ m\u00a0<\/span>2<\/span><\/sup>K, respectivamente.\u00a0Observe que esses coeficientes de convec\u00e7\u00e3o dependem muito especialmente das condi\u00e7\u00f5es ambientais e interiores (vento, umidade etc.).<\/span><\/p>\n

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  1. Calcule o fluxo de calor (\u00a0<\/span>perda de calor<\/span><\/strong><\/a>\u00a0) atrav\u00e9s desta parede n\u00e3o isolada.<\/span><\/li>\n
  2. Agora assuma o\u00a0<\/span>isolamento t\u00e9rmico<\/span><\/strong>\u00a0no lado externo desta parede.\u00a0Use\u00a0<\/span>um\u00a0<\/span><\/strong>\u00a0isolamento de l\u00e3 de\u00a0<\/span><\/strong>vidro com<\/strong>\u00a010 cm de espessura (L\u00a0<\/span>2<\/span><\/sub>\u00a0) com a condutividade t\u00e9rmica de k\u00a0<\/span>2<\/span><\/sub>\u00a0= 0,023 W \/ mK e calcule o fluxo de\u00a0<\/span>calor<\/span><\/strong><\/a>\u00a0(\u00a0perda de calor<\/strong><\/a>\u00a0) atrav\u00e9s dessa parede composta.<\/span><\/li>\n<\/ol>\n

    Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n

    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>condu\u00e7\u00e3o<\/span><\/a>\u00a0e\u00a0<\/span>convec\u00e7\u00e3o<\/span><\/a>\u00a0.\u00a0Com estes sistemas compostos, muitas vezes \u00e9 conveniente trabalhar com um\u00a0<\/span>coeficiente de transfer\u00eancia total de calor<\/span><\/a>\u00a0,<\/span><\/strong>\u00a0conhecido como um\u00a0<\/span>factor-L<\/span><\/strong>\u00a0.\u00a0O fator U \u00e9 definido por uma express\u00e3o an\u00e1loga \u00e0\u00a0<\/span>lei do resfriamento de Newton<\/span><\/strong><\/a>\u00a0:<\/span><\/p>\n

    \"fator<\/a><\/p>\n

    O\u00a0<\/span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong>\u00a0est\u00e1 relacionado \u00e0\u00a0<\/span>resist\u00eancia t\u00e9rmica total<\/span><\/a>\u00a0e depende da geometria do problema.<\/span><\/p>\n

      \n
    1. parede nua<\/span><\/strong><\/li>\n<\/ol>\n

      Assumindo a transfer\u00eancia de calor unidimensional atrav\u00e9s da parede plana e desconsiderando a radia\u00e7\u00e3o, o\u00a0<\/span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong>\u00a0pode ser calculado como:<\/span><\/p>\n

      \"coeficiente<\/a><\/p>\n

      O\u00a0<\/span>coeficiente geral de transfer\u00eancia de calor<\/span><\/strong>\u00a0\u00e9 ent\u00e3o:<\/span><\/p>\n

      U = 1 \/ (1\/1<\/span><\/p>\n<\/div>\n<\/div>\n

      ……………………………………………………………………………………………………………………………….<\/p>\n

      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":"

      Exemplo – C\u00e1lculo de isolamento de l\u00e3 de vidro.\u00a0Calcule o fluxo de calor (perda de calor) atrav\u00e9s da parede isolada.\u00a0Use isolamento de l\u00e3 de vidro com 10 cm de espessura.\u00a0Compare com uma parede nua.\u00a0Engenharia T\u00e9rmica Exemplo – Isolamento de L\u00e3 de Vidro Uma das principais fontes de\u00a0perda\u00a0de\u00a0calor\u00a0de uma casa \u00e9 atrav\u00e9s das paredes.\u00a0Calcule a taxa … 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":"\nExemplo - C\u00e1lculo de isolamento de l\u00e3 de vidro - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Exemplo - C\u00e1lculo de isolamento de l\u00e3 de vidro. Calcule o fluxo de calor (perda de calor) atrav\u00e9s da parede isolada. Use isolamento de l\u00e3 de vidro com 10 cm de espessura. 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