{"id":684187,"date":"2024-09-28T10:40:46","date_gmt":"2024-09-28T09:40:46","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=684187"},"modified":"2024-09-28T10:40:46","modified_gmt":"2024-09-28T09:40:46","slug":"kha-nang-cach-nhiet-cua-vat-lieu-cach-nhiet","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/kha-nang-cach-nhiet-cua-vat-lieu-cach-nhiet\/","title":{"rendered":"Kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">Kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t: T\u00ecm hi\u1ec3u c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u t\u1ed1t nh\u1ea5t, v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf trong x\u00e2y d\u1ef1ng v\u00e0 \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/kha_nang_cach_nhiet_cua_vat_lieu_cach_nhiet.png\" alt=\"Kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Kh\u1ea3 N\u0103ng C\u00e1ch Nhi\u1ec7t C\u1ee7a V\u1eadt Li\u1ec7u C\u00e1ch Nhi\u1ec7t<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t, kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t l\u00e0 m\u1ed9t \u0111\u1eb7c t\u00ednh quan tr\u1ecdng c\u1ee7a v\u1eadt li\u1ec7u. Nh\u1eefng v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 gi\u1ea3m thi\u1ec3u s\u1ef1 truy\u1ec1n nhi\u1ec7t gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng c\u00f3 nhi\u1ec7t \u0111\u1ed9 kh\u00e1c nhau. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea3o v\u1ec7 c\u00e1c h\u1ec7 th\u1ed1ng v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 th\u00f4ng tin c\u01a1 b\u1ea3n v\u1ec1 kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn n\u00f3.<\/p>\n<h2>H\u1ec7 S\u1ed1 D\u1eabn Nhi\u1ec7t (Thermal Conductivity)<\/h2>\n<p>H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t, k\u00fd hi\u1ec7u l\u00e0 <em>k<\/em>, l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 quan tr\u1ecdng \u0111\u1ec3 \u0111o l\u01b0\u1eddng kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u. H\u1ec7 s\u1ed1 n\u00e0y th\u1ec3 hi\u1ec7n l\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n qua m\u1ed9t \u0111\u01a1n v\u1ecb d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u khi c\u00f3 m\u1ed9t \u0111\u01a1n v\u1ecb nhi\u1ec7t \u0111\u1ed9 ch\u00eanh l\u1ec7ch gi\u1eefa hai m\u1eb7t.<\/p>\n<ul>\n<li>H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t th\u1ea5p: v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t t\u1ed1t (v\u00ed d\u1ee5: s\u1ee3i th\u1ee7y tinh, b\u1ecdt polyurethane).<\/li>\n<li>H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t cao: v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t k\u00e9m (v\u00ed d\u1ee5: kim lo\u1ea1i, \u0111\u00e1).<\/li>\n<\/ul>\n<p>\u0110\u01a1n v\u1ecb c\u1ee7a h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng W\/m\u00b7K (Watt tr\u00ean m\u00e9t tr\u00ean Kelvin).<\/p>\n<h2>H\u1ec7 S\u1ed1 C\u1ea3n Nhi\u1ec7t (R-value)<\/h2>\n<p>H\u1ec7 s\u1ed1 c\u1ea3n nhi\u1ec7t, k\u00fd hi\u1ec7u l\u00e0 <em>R<\/em>, l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 kh\u00e1c \u0111\u1ec3 th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u. R-value c\u00e0ng cao th\u00ec kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e0ng t\u1ed1t.<\/p>\n<ul>\n<li>R-value \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c: <em>R = d\/k<\/em>, trong \u0111\u00f3 <em>d<\/em> l\u00e0 \u0111\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u v\u00e0 <em>k<\/em> l\u00e0 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t.<\/li>\n<li>\u0110\u01a1n v\u1ecb c\u1ee7a R-value l\u00e0 m<sup>2<\/sup>\u00b7K\/W.<\/li>\n<\/ul>\n<h2>C\u00e1c Y\u1ebfu T\u1ed1 \u1ea2nh H\u01b0\u1edfng \u0110\u1ebfn Kh\u1ea3 N\u0103ng C\u00e1ch Nhi\u1ec7t<\/h2>\n<p>C\u00f3 nhi\u1ec1u y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u:<\/p>\n<ol>\n<li><strong>\u0110\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u:<\/strong> \u0110\u1ed9 d\u00e0y c\u00e0ng l\u1edbn th\u00ec kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u00e0ng t\u1ed1t.<\/li>\n<li><strong>T\u00ednh ch\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u:<\/strong> V\u00ed d\u1ee5, c\u00e1c v\u1eadt li\u1ec7u c\u00f3 c\u1ea5u tr\u00fac vi m\u00f4 nh\u01b0 b\u1ecdt kh\u00ed th\u01b0\u1eddng c\u00f3 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t th\u1ea5p h\u01a1n.<\/li>\n<li><strong>\u0110\u1ed9 \u1ea9m:<\/strong> \u0110\u1ed9 \u1ea9m cao c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n<li><strong>Nhi\u1ec7t \u0111\u1ed9:<\/strong> M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u c\u00f3 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t thay \u0111\u1ed5i khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i.<\/li>\n<\/ol>\n<h2>\u1ee8ng D\u1ee5ng Th\u1ef1c T\u1ebf<\/h2>\n<p>V\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p v\u00e0 x\u00e2y d\u1ef1ng:<\/p>\n<ul>\n<li><strong>Ng\u00e0nh x\u00e2y d\u1ef1ng:<\/strong> D\u00f9ng \u0111\u1ec3 c\u00e1ch nhi\u1ec7t m\u00e1i, t\u01b0\u1eddng v\u00e0 s\u00e0n nh\u00e0 \u0111\u1ec3 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng.<\/li>\n<li><strong>Ng\u00e0nh c\u00f4ng nghi\u1ec7p l\u1ea1nh:<\/strong> D\u00f9ng trong h\u1ec7 th\u1ed1ng l\u1ea1nh v\u00e0 t\u1ee7 l\u1ea1nh \u0111\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/li>\n<li><strong>Ng\u00e0nh giao th\u00f4ng v\u1eadn t\u1ea3i:<\/strong> D\u00f9ng trong c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n v\u1eadn t\u1ea3i \u0111\u1ec3 c\u00e1ch nhi\u1ec7t gi\u1eefa l\u00f2ng v\u00e0 v\u1ecf ngo\u00e0i.<\/li>\n<\/ul>\n<p>Nh\u01b0 v\u1eady, kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c b\u1ea3o v\u1ec7 c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c ch\u1ec9 s\u1ed1 v\u00e0 y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng s\u1ebd gi\u00fap l\u1ef1a ch\u1ecdn lo\u1ea1i v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p cho t\u1eebng \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t: T\u00ecm hi\u1ec3u c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u t\u1ed1t nh\u1ea5t, v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf trong x\u00e2y d\u1ef1ng v\u00e0 \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y.<\/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>Kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t 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