{"id":692044,"date":"2024-09-20T09:55:54","date_gmt":"2024-09-20T08:55:54","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=692044"},"modified":"2024-09-20T09:55:54","modified_gmt":"2024-09-20T08:55:54","slug":"phan-tich-nhiet-cua-cac-vat-lieu-xay-dung","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/phan-tich-nhiet-cua-cac-vat-lieu-xay-dung\/","title":{"rendered":"Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng"},"content":{"rendered":"<p class=\"sidekick\">Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng: Kh\u00e1m ph\u00e1 c\u00e1ch c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 b\u00ea t\u00f4ng, g\u1ea1ch v\u00e0 th\u00e9p ch\u1ecbu nhi\u1ec7t, gi\u00fap t\u1ed1i \u01b0u hi\u1ec7u qu\u1ea3 n\u0103ng l\u01b0\u1ee3ng trong x\u00e2y d\u1ef1ng.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/phan_tich_nhiet_cua_cac_vat_lieu_xay_dung.png\" alt=\"Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Ph\u00e2n T\u00edch Nhi\u1ec7t c\u1ee7a C\u00e1c V\u1eadt Li\u1ec7u X\u00e2y D\u1ef1ng<\/h2>\n<p>Ph\u00e2n t\u00edch nhi\u1ec7t l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong ng\u00e0nh k\u1ef9 thu\u1eadt x\u00e2y d\u1ef1ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi l\u1ef1a ch\u1ecdn v\u00e0 s\u1eed d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng. Nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n, hi\u1ec7u su\u1ea5t v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a c\u00e1c c\u00f4ng tr\u00ecnh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng.<\/p>\n<h2>T\u00ednh D\u1eabn Nhi\u1ec7t (Thermal Conductivity)<\/h2>\n<p>T\u00ednh d\u1eabn nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u l\u00e0 kh\u1ea3 n\u0103ng d\u1eabn truy\u1ec1n nhi\u1ec7t c\u1ee7a n\u00f3. Th\u00f4ng s\u1ed1 n\u00e0y \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb Watt tr\u00ean m\u00e9t Kelvin (W\/m\u00b7K). C\u00e1c v\u1eadt li\u1ec7u c\u00f3 t\u00ednh d\u1eabn nhi\u1ec7t cao nh\u01b0 kim lo\u1ea1i s\u1ebd truy\u1ec1n nhi\u1ec7t nhanh ch\u00f3ng, trong khi c\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t nh\u01b0 b\u00f4ng th\u1ee7y tinh hay polystyrene s\u1ebd truy\u1ec1n nhi\u1ec7t ch\u1eadm h\u01a1n.<\/p>\n<ul>\n<li>Kim lo\u1ea1i: \u0111\u1ed3ng, th\u00e9p, nh\u00f4m<\/li>\n<li>V\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t: b\u00f4ng th\u1ee7y tinh, polystyrene, polyurethane<\/li>\n<\/ul>\n<h2>\u0110\u1ed9 Khu\u1ebfch T\u00e1n Nhi\u1ec7t (Thermal Diffusivity)<\/h2>\n<p>\u0110\u1ed9 khu\u1ebfch t\u00e1n nhi\u1ec7t l\u00e0 th\u01b0\u1edbc \u0111o t\u1ed1c \u0111\u1ed9 m\u00e0 nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i b\u00ean trong v\u1eadt li\u1ec7u. \u0110\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng \u0111\u01a1n v\u1ecb m\u00e9t vu\u00f4ng tr\u00ean gi\u00e2y (m<sup>2<\/sup>\/s), n\u00f3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi:<\/p>\n<p>\\( \\alpha = \\frac{k}{\\rho c_p} \\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\\( \\alpha \\): \u0110\u1ed9 khu\u1ebfch t\u00e1n nhi\u1ec7t<\/li>\n<li>\\( k \\): T\u00ednh d\u1eabn nhi\u1ec7t<\/li>\n<li>\\( \\rho \\): Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang<\/li>\n<li>\\( c_p \\): Nhi\u1ec7t dung ri\u00eang<\/li>\n<\/ul>\n<h2>Kh\u1ea3 N\u0103ng C\u00e1ch Nhi\u1ec7t (R-Value)<\/h2>\n<p>R-Value l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u. C\u00e1c gi\u00e1 tr\u1ecb R cao h\u01a1n cho th\u1ea5y kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t t\u1ed1t h\u01a1n. C\u00e1ch t\u00ednh to\u00e1n R-Value \u0111\u01a1n gi\u1ea3n l\u00e0:<\/p>\n<p>\\( R = \\frac{d}{k} \\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\\( R \\): Kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t (m<sup>2<\/sup>\u00b7K\/W)<\/li>\n<li>\\{d)}: \u0110\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u (m)<\/li>\n<li>\\( k \\): T\u00ednh d\u1eabn nhi\u1ec7t (W\/m\u00b7K)<\/li>\n<\/ul>\n<h2>\u1ee8ng D\u1ee5ng Th\u1ef1c T\u1ebf<\/h2>\n<p>Trong x\u00e2y d\u1ef1ng, vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u c\u0103n c\u1ee9 tr\u00ean kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu nhi\u1ec7t l\u00e0 v\u00f4 c\u00f9ng quan tr\u1ecdng. V\u00ed d\u1ee5, vi\u1ec7c s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t trong t\u01b0\u1eddng v\u00e0 m\u00e1i nh\u00e0 c\u00f3 th\u1ec3 gi\u00fap ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u00ean trong, gi\u1ea3m ti\u00eau hao n\u0103ng l\u01b0\u1ee3ng cho h\u1ec7 th\u1ed1ng s\u01b0\u1edfi v\u00e0 l\u00e0m m\u00e1t. C\u00e1c v\u1eadt li\u1ec7u nh\u01b0 g\u1ea1ch, b\u00ea t\u00f4ng, v\u00e0 g\u1ed7 c\u0169ng \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn d\u1ef1a tr\u00ean t\u00ednh n\u0103ng c\u00e1ch nhi\u1ec7t v\u00e0 \u0111\u1ed9 b\u1ec1n nhi\u1ec7t c\u1ee7a ch\u00fang.<\/p>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng kh\u00f4ng ch\u1ec9 gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u00f4ng tr\u00ecnh m\u00e0 c\u00f2n g\u00f3p ph\u1ea7n ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c th\u00f4ng s\u1ed1 nh\u01b0 t\u00ednh d\u1eabn nhi\u1ec7t, \u0111\u1ed9 khu\u1ebfch t\u00e1n nhi\u1ec7t v\u00e0 kh\u1ea3 n\u0103ng c\u00e1ch nhi\u1ec7t l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 ch\u1ecdn l\u1ef1a v\u00e0 s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng: Kh\u00e1m ph\u00e1 c\u00e1ch c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 b\u00ea t\u00f4ng, g\u1ea1ch v\u00e0 th\u00e9p ch\u1ecbu nhi\u1ec7t, gi\u00fap t\u1ed1i \u01b0u hi\u1ec7u qu\u1ea3 n\u0103ng l\u01b0\u1ee3ng trong x\u00e2y d\u1ef1ng.<\/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 - 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