{"id":699112,"date":"2024-11-01T10:16:24","date_gmt":"2024-11-01T09:16:24","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699112"},"modified":"2024-11-01T10:16:24","modified_gmt":"2024-11-01T09:16:24","slug":"nhiet-dong-hoc-trong-thiet-ke-vat-lieu-cach-nhiet","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/nhiet-dong-hoc-trong-thiet-ke-vat-lieu-cach-nhiet\/","title":{"rendered":"Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t: Gi\u1ea3i th\u00edch c\u00e1ch nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t, gi\u1ea3m ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/nhiet_dong_hoc_trong_thiet_ke_vat_lieu_cach_nhiet.png\" alt=\"Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t<\/h2>\n<p>Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc l\u00e0 m\u1ed9t nh\u00e1nh c\u1ee7a v\u1eadt l\u00fd h\u1ecdc nghi\u00ean c\u1ee9u v\u1ec1 nhi\u1ec7t v\u00e0 c\u00e1ch m\u00e0 nhi\u1ec7t t\u01b0\u01a1ng t\u00e1c v\u1edbi v\u1eadt ch\u1ea5t. Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t, nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u00f3 vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t, gi\u00fap ng\u0103n ch\u1eb7n s\u1ef1 truy\u1ec1n nhi\u1ec7t t\u1eeb m\u1ed9t khu v\u1ef1c n\u00e0y sang khu v\u1ef1c kh\u00e1c. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 x\u00e2y d\u1ef1ng, thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed v\u00e0 h\u00e0ng kh\u00f4ng.<\/p>\n<h2>V\u00ed d\u1ee5 v\u1ec1 \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t<\/h2>\n<p><u1><\/p>\n<li><b>X\u00e2y d\u1ef1ng:<\/b> V\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t trong x\u00e2y d\u1ef1ng gi\u00fap duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 trong c\u00e1c t\u00f2a nh\u00e0, gi\u1ea3m thi\u1ec3u n\u0103ng l\u01b0\u1ee3ng ti\u00eau th\u1ee5 cho vi\u1ec7c l\u00e0m m\u00e1t ho\u1eb7c s\u01b0\u1edfi \u1ea5m.<\/li>\n<li><b>Thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed:<\/b> C\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed nh\u01b0 CPU v\u00e0 GPU c\u1ea7n v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u1ec3 qu\u1ea3n l\u00fd v\u00e0 \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<li><b>H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5:<\/b> T\u00e0u v\u0169 tr\u1ee5 c\u1ea7n s\u1eed d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u1ec3 b\u1ea3o v\u1ec7 kh\u1ecfi nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao khi t\u00e1i nh\u1eadp v\u00e0o kh\u00ed quy\u1ec3n Tr\u00e1i \u0111\u1ea5t.<\/li>\n<p><\/u1><\/p>\n<h2>C\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t, ch\u00fang ta c\u1ea7n n\u1eafm v\u1eefng m\u1ed9t s\u1ed1 kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n sau:<\/p>\n<p><u1><\/p>\n<li><b>Nhi\u1ec7t dung ri\u00eang (c):<\/b> L\u01b0\u1ee3ng nhi\u1ec7t c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m t\u0103ng 1 \u0111\u1ed9 C nhi\u1ec7t \u0111\u1ed9 c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb kh\u1ed1i l\u01b0\u1ee3ng ch\u1ea5t.<\/li>\n<li><b>\u0110\u1ecbnh lu\u1eadt Fourier:<\/b> M\u00f4 t\u1ea3 s\u1ef1 d\u1eabn nhi\u1ec7t l\u00e0 t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi gradient nhi\u1ec7t \u0111\u1ed9 v\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t, v\u00e0 t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi \u0111\u01b0\u1eddng d\u1eabn nhi\u1ec7t.\n<ul>\n<li>Ph\u01b0\u01a1ng tr\u00ecnh: <i>q = -k \\frac{dT}{dx}<\/i>,<br \/>\n        n\u01a1i q l\u00e0 d\u00f2ng nhi\u1ec7t, k l\u00e0 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t, v\u00e0 \\frac{dT}{dx} l\u00e0 gradient nhi\u1ec7t \u0111\u1ed9.<\/li>\n<\/ul>\n<\/li>\n<li><b>\u0110\u1ecbnh lu\u1eadt Stefan-Boltzmann:<\/b> M\u00f4 t\u1ea3 s\u1ef1 ph\u00e1t x\u1ea1 nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt th\u1ec3 ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t c\u1ee7a n\u00f3.\n<ul>\n<li>Ph\u01b0\u01a1ng tr\u00ecnh: <i>P = \\sigma \\epsilon A T^{4}<\/i>,<br \/>\n        n\u01a1i P l\u00e0 c\u00f4ng su\u1ea5t ph\u00e1t x\u1ea1, \u03c3 l\u00e0 h\u1eb1ng s\u1ed1 Stefan-Boltzmann, \u03b5 l\u00e0 \u0111\u1ed9 ph\u00e1t x\u1ea1 c\u1ee7a v\u1eadt li\u1ec7u, A l\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t v\u00e0 T l\u00e0 nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t.<\/li>\n<\/ul>\n<\/li>\n<p><\/u1><\/p>\n<h2>Quy tr\u00ecnh thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t<\/h2>\n<p><o1><\/p>\n<li><b>Ch\u1ecdn v\u1eadt li\u1ec7u c\u01a1 b\u1ea3n:<\/b> C\u00e1c \u0111\u1eb7c t\u00ednh nh\u01b0 nhi\u1ec7t dung ri\u00eang, \u0111\u1ed9 d\u1eabn nhi\u1ec7t v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t \u0111\u01b0\u1ee3c c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng.<\/li>\n<li><b>Quan t\u00e2m t\u1edbi t\u00ednh ch\u1ea5t m\u00f4i tr\u01b0\u1eddng:<\/b> V\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t c\u1ea7n \u0111\u00e1p \u1ee9ng t\u1ed1t trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng kh\u00e1c nhau nh\u01b0 nhi\u1ec7t \u0111\u1ed9, \u0111\u1ed9 \u1ea9m, ho\u00e1 ch\u1ea5t.<\/li>\n<li><b>Thi\u1ebft k\u1ebf c\u1ea5u tr\u00fac:<\/b> C\u1ea5u tr\u00fac c\u1ee7a v\u1eadt li\u1ec7u, v\u00ed d\u1ee5 nh\u01b0 t\u1ed5 ong ho\u1eb7c l\u1edbp \u0111a l\u1edbp, \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u00e1ch nhi\u1ec7t.<\/li>\n<li><b>Ki\u1ec3m tra v\u00e0 \u0111\u00e1nh gi\u00e1:<\/b> Sau khi thi\u1ebft k\u1ebf, m\u1eabu v\u1eadt li\u1ec7u c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t c\u00e1ch nhi\u1ec7t.<\/li>\n<p><\/o1><\/p>\n<p>T\u00f3m l\u1ea1i, vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean l\u00fd nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc v\u00e0o thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t kh\u00f4ng ch\u1ec9 gi\u00fap gia t\u0103ng hi\u1ec7u su\u1ea5t s\u1eed d\u1ee5ng n\u0103ng l\u01b0\u1ee3ng m\u00e0 c\u00f2n c\u00f3 \u00fd ngh\u0129a quan tr\u1ecdng \u0111\u1ed1i v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n b\u1ec1n v\u1eefng c\u1ee7a ng\u00e0nh c\u00f4ng nghi\u1ec7p x\u00e2y d\u1ef1ng, \u0111i\u1ec7n t\u1eed, v\u00e0 h\u00e0ng kh\u00f4ng. Hi\u1ec3u r\u00f5 v\u00e0 v\u1eadn d\u1ee5ng t\u1ed1t c\u00e1c nguy\u00ean l\u00fd n\u00e0y ch\u00ednh l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c nh\u1eefng b\u01b0\u1edbc ti\u1ebfn v\u01b0\u1ee3t b\u1eadc trong vi\u1ec7c ch\u1ebf t\u1ea1o c\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t hi\u1ec7u qu\u1ea3 cao.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc trong thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t: Gi\u1ea3i th\u00edch c\u00e1ch nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t, gi\u1ea3m ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng.<\/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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