{"id":673371,"date":"2024-08-03T07:54:28","date_gmt":"2024-08-03T06:54:28","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=673371"},"modified":"2024-08-03T07:54:28","modified_gmt":"2024-08-03T06:54:28","slug":"cach-do-dan-nhiet-anh-huong-den-dong-nhiet","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/cach-do-dan-nhiet-anh-huong-den-dong-nhiet\/","title":{"rendered":"C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t: Gi\u1ea3i th\u00edch c\u00e1ch m\u00e0 \u0111\u1ed9 d\u1eabn nhi\u1ec7t t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t qua c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c nhau.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/cach_do_dan_nhiet_anh_huong_den_dong_nhiet.png\" alt=\"C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t<\/h2>\n<p>Trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t, \u0111\u1ed9 d\u1eabn nhi\u1ec7t (k\u00fd hi\u1ec7u l\u00e0 \\( k \\) ho\u1eb7c \\( \\lambda \\)) l\u00e0 m\u1ed9t trong nh\u1eefng tham s\u1ed1 quan tr\u1ecdng nh\u1ea5t. \u0110\u00f3 l\u00e0 m\u1ed9t th\u01b0\u1edbc \u0111o kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u \u0111\u1ec3 d\u1eabn nhi\u1ec7t. Hi\u1ec3u c\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t c\u00f3 th\u1ec3 gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u qu\u1ea3 h\u01a1n trong vi\u1ec7c ki\u1ec3m so\u00e1t v\u00e0 qu\u1ea3n l\u00fd nhi\u1ec7t.<\/p>\n<h2>\u0110\u1ed9 d\u1eabn nhi\u1ec7t l\u00e0 g\u00ec?<\/h2>\n<p>\u0110\u1ed9 d\u1eabn nhi\u1ec7t l\u00e0 m\u1ed9t h\u1ec7 s\u1ed1 \u0111\u1eb7c tr\u01b0ng cho kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u. N\u00f3 \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb W\/m\u00b7K (Watt tr\u00ean m\u00e9t-Kelvin). C\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n cho lu\u1eadt Fourier v\u1ec1 d\u1eabn nhi\u1ec7t l\u00e0:<\/p>\n<p>\\( q = -k \\cdot A \\cdot \\frac{dT}{dx} \\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\\( q \\): d\u00f2ng nhi\u1ec7t (W)<\/li>\n<li>\\( k \\): \u0111\u1ed9 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u (W\/m\u00b7K)<\/li>\n<li>\\( A \\): di\u1ec7n t\u00edch m\u00e0 qua \u0111\u00f3 nhi\u1ec7t truy\u1ec1n (m<sup>2<\/sup>)<\/li>\n<li>\\( \\frac{dT}{dx} \\): gradient nhi\u1ec7t \u0111\u1ed9 (K\/m)<\/li>\n<\/ul>\n<h2>\u1ea2nh h\u01b0\u1edfng c\u1ee7a \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u0111\u1ebfn d\u00f2ng nhi\u1ec7t<\/h2>\n<p>\u0110\u1ed9 d\u1eabn nhi\u1ec7t c\u00e0ng cao, v\u1eadt li\u1ec7u c\u00e0ng c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t t\u1ed1t v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c minh h\u1ecda qua m\u1ed9t s\u1ed1 v\u00ed d\u1ee5:<\/p>\n<ol>\n<li>V\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao: \u0110\u1ed3ng, nh\u00f4m v\u00e0 c\u00e1c kim lo\u1ea1i kh\u00e1c th\u01b0\u1eddng c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao. \u0110i\u1ec1u n\u00e0y l\u00e0m cho ch\u00fang l\u00fd t\u01b0\u1edfng cho vi\u1ec7c s\u1eed d\u1ee5ng trong c\u00e1c b\u1ed9 t\u1ea3n nhi\u1ec7t v\u00e0 c\u00e1c thi\u1ebft b\u1ecb l\u00e0m m\u00e1t.<\/li>\n<li>V\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p: G\u1ed7, nh\u1ef1a v\u00e0 kh\u00f4ng kh\u00ed c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u0111\u1ec3 gi\u1eef nhi\u1ec7t kh\u00f4ng b\u1ecb m\u1ea5t \u0111i.<\/li>\n<\/ol>\n<h2>\u1ee8ng d\u1ee5ng trong th\u1ef1c t\u1ebf<\/h2>\n<p>Vi\u1ec7c hi\u1ec3u r\u00f5 v\u1ec1 \u0111\u1ed9 d\u1eabn nhi\u1ec7t kh\u00f4ng ch\u1ec9 gi\u00fap trong vi\u1ec7c thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t m\u00e0 c\u00f2n trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nh\u01b0 x\u00e2y d\u1ef1ng, \u0111i\u1ec7n t\u1eed v\u00e0 s\u1ea3n xu\u1ea5t \u00f4 t\u00f4. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf:<\/p>\n<ul>\n<li><b>X\u00e2y d\u1ef1ng:<\/b> V\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p nh\u01b0 b\u00f4ng kho\u00e1ng v\u00e0 s\u1ee3i th\u1ee7y tinh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u00e1ch nhi\u1ec7t cho c\u00e1c t\u00f2a nh\u00e0, gi\u00fap ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 b\u00ean trong \u1ed5n \u0111\u1ecbnh.<\/li>\n<li><b>\u0110i\u1ec7n t\u1eed:<\/b> C\u00e1c v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao nh\u01b0 h\u1ee3p kim \u0111\u1ed3ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c b\u1ed9 t\u1ea3n nhi\u1ec7t \u0111\u1ec3 gi\u1eef cho linh ki\u1ec7n \u0111i\u1ec7n t\u1eed kh\u00f4ng b\u1ecb qu\u00e1 n\u00f3ng.<\/li>\n<li><b>S\u1ea3n xu\u1ea5t \u00f4 t\u00f4:<\/b> C\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t \u0111\u1ed9ng c\u01a1 s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p c\u00e1c v\u1eadt li\u1ec7u d\u1eabn nhi\u1ec7t cao v\u00e0 th\u1ea5p \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u.<\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n nh\u01b0ng r\u1ea5t quan tr\u1ecdng trong k\u1ef9 thu\u1eadt nhi\u1ec7t. B\u1eb1ng c\u00e1ch l\u1ef1a ch\u1ecdn \u0111\u00fang v\u1eadt li\u1ec7u v\u1edbi \u0111\u1ed9 d\u1eabn nhi\u1ec7t ph\u00f9 h\u1ee3p, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a nhi\u1ec1u h\u1ec7 th\u1ed1ng v\u00e0 thi\u1ebft b\u1ecb, t\u1eeb c\u00e1c t\u00f2a nh\u00e0 cho \u0111\u1ebfn c\u00e1c s\u1ea3n ph\u1ea9m \u0111i\u1ec7n t\u1eed v\u00e0 ph\u01b0\u01a1ng ti\u1ec7n di chuy\u1ec3n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t: Gi\u1ea3i th\u00edch c\u00e1ch m\u00e0 \u0111\u1ed9 d\u1eabn nhi\u1ec7t t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t qua c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c nhau.<\/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 \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t<\/title>\n<meta name=\"description\" content=\"C\u00e1ch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u00f2ng nhi\u1ec7t: Gi\u1ea3i th\u00edch c\u00e1ch m\u00e0 \u0111\u1ed9 d\u1eabn nhi\u1ec7t t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t qua c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c nhau.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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