{"id":703230,"date":"2024-11-08T17:25:39","date_gmt":"2024-11-08T16:25:39","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=703230"},"modified":"2024-11-08T17:25:39","modified_gmt":"2024-11-08T16:25:39","slug":"cach-nhiet-chiu-nhiet-do-cao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/cach-nhiet-chiu-nhiet-do-cao\/","title":{"rendered":"C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao"},"content":{"rendered":"<p class=\"sidekick\">C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao: Gi\u1ea3i th\u00edch c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n gi\u00fap b\u1ea3o v\u1ec7 c\u00f4ng tr\u00ecnh kh\u1ecfi t\u00e1c \u0111\u1ed9ng nhi\u1ec7t \u0111\u1ed9 c\u1ef1c \u0111oan.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/cach_nhiet_chiu_nhiet_do_cao.png\" alt=\"C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>C\u00e1ch Nhi\u1ec7t Ch\u1ecbu Nhi\u1ec7t \u0110\u1ed9 Cao<\/h2>\n<p>C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao l\u00e0 m\u1ed9t nh\u00e1nh quan tr\u1ecdng trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t. Hi\u1ec3u r\u00f5 v\u1ec1 c\u00e1ch nhi\u1ec7t c\u00f3 th\u1ec3 gi\u00fap b\u1ea3o v\u1ec7 c\u00e1c v\u1eadt li\u1ec7u, gi\u1ea3m ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng, v\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n trong nhi\u1ec1u \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p.<\/p>\n<h2>C\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao<\/h2>\n<ul>\n<li><b>G\u1ea1ch ch\u1ecbu l\u1eeda:<\/b> \u0110\u00e2y l\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00e1c h\u1ee3p ch\u1ea5t ch\u1ecbu nhi\u1ec7t cao nh\u01b0 alumina, silica ho\u1eb7c magnesia. Ch\u00fang c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 cao l\u00ean \u0111\u1ebfn 1700\u00b0C v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u00f2 s\u01b0\u1edfi, l\u00f2 nung v\u00e0 c\u00e1c m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 r\u1ea5t cao kh\u00e1c.<\/li>\n<li><b>V\u1eadt li\u1ec7u g\u1ed1m s\u1ee9:<\/b> G\u1ed1m s\u1ee9 l\u00e0 v\u1eadt li\u1ec7u cao c\u1ea5p v\u1edbi kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 \u0111\u1ed9 b\u1ec1n cao. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf, c\u00f4ng nghi\u1ec7p h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec7n t\u1eed cao c\u1ea5p.<\/li>\n<li><b>S\u1ee3i th\u1ee7y tinh:<\/b> S\u1ee3i th\u1ee7y tinh \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb s\u1ee3i m\u1ecfng c\u1ee7a th\u1ee7y tinh v\u00e0 c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 l\u00ean \u0111\u1ebfn 1000\u00b0C. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn nhi\u1ec7t v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn c\u00e1ch nhi\u1ec7t c\u1ee7a \u0111\u1ed9ng c\u01a1.<\/li>\n<\/ul>\n<h2>Nguy\u00ean l\u00fd c\u00e1ch nhi\u1ec7t<\/h2>\n<p>C\u00e1ch nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd gi\u1ea3m truy\u1ec1n nhi\u1ec7t qua ba h\u00ecnh th\u1ee9c c\u01a1 b\u1ea3n:<\/p>\n<ol>\n<li><b>D\u1eabn nhi\u1ec7t (Conduction):<\/b> Qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua v\u1eadt li\u1ec7u r\u1eafn t\u1eeb v\u1ecb tr\u00ed c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao sang v\u1ecb tr\u00ed c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. C\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ec3 t\u00ednh d\u1eabn nhi\u1ec7t l\u00e0:<\/li>\n<p>\n\\[ Q = k * A * \\frac{\\Delta T}{d} \\]\n<\/p>\n<li><b>\u0110\u1ed1i l\u01b0u (Convection):<\/b> Truy\u1ec1n nhi\u1ec7t qua ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed. V\u00ed d\u1ee5, n\u01b0\u1edbc n\u00f3ng l\u01b0u th\u00f4ng trong h\u1ec7 th\u1ed1ng s\u01b0\u1edfi nhi\u1ec7t d\u01b0\u1edbi s\u00e0n nh\u00e0. \u0110\u1ed1i l\u01b0u c\u00f3 th\u1ec3 l\u00e0 t\u1ef1 nhi\u00ean ho\u1eb7c c\u01b0\u1ee1ng b\u1ee9c.<\/li>\n<li><b>B\u1ee9c x\u1ea1 (Radiation):<\/b> Truy\u1ec1n nhi\u1ec7t qua s\u00f3ng \u0111i\u1ec7n t\u1eeb. M\u1eb7t tr\u1eddi s\u01b0\u1edfi \u1ea5m Tr\u00e1i \u0110\u1ea5t ch\u00ednh l\u00e0 m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 b\u1ee9c x\u1ea1 nhi\u1ec7t.<\/li>\n<\/ol>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a c\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao<\/h2>\n<p>C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng trong \u0111\u1eddi s\u1ed1ng v\u00e0 c\u00f4ng nghi\u1ec7p, bao g\u1ed3m:<\/p>\n<ul>\n<li><b>Ng\u00e0nh c\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t:<\/b> S\u1eed d\u1ee5ng trong c\u00e1c l\u00f2 ph\u1ea3n \u1ee9ng v\u00e0 h\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn \u0111\u1ec3 gi\u1ea3m ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng.<\/li>\n<li><b>Ng\u00e0nh x\u00e2y d\u1ef1ng:<\/b> C\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 k\u1ebft c\u1ea5u x\u00e2y d\u1ef1ng kh\u1ecfi h\u01b0 h\u1ea1i do nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 \u0111\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh b\u00ean trong c\u00e1c t\u00f2a nh\u00e0.<\/li>\n<li><b>C\u00f4ng nghi\u1ec7p \u00f4 t\u00f4:<\/b> C\u00e1ch nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c b\u1ed9 ph\u1eadn \u0111\u1ed9ng c\u01a1 v\u00e0 h\u1ec7 th\u1ed1ng x\u1ea3 kh\u1ecfi nhi\u1ec7t \u0111\u1ed9 cao.<\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p v\u00e0 \u1ee9ng d\u1ee5ng \u0111\u1eddi s\u1ed1ng. S\u1eed d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u00fang c\u00e1ch c\u00f3 th\u1ec3 gi\u00fap b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng, v\u00e0 t\u0103ng c\u01b0\u1eddng an to\u00e0n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao: Gi\u1ea3i th\u00edch c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n gi\u00fap b\u1ea3o v\u1ec7 c\u00f4ng tr\u00ecnh kh\u1ecfi t\u00e1c \u0111\u1ed9ng nhi\u1ec7t \u0111\u1ed9 c\u1ef1c \u0111oan.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e1ch nhi\u1ec7t ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 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