{"id":707455,"date":"2024-11-21T07:41:53","date_gmt":"2024-11-21T06:41:53","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=707455"},"modified":"2024-11-21T07:41:53","modified_gmt":"2024-11-21T06:41:53","slug":"su-suy-giam-nhiet-cua-vat-lieu","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/su-suy-giam-nhiet-cua-vat-lieu\/","title":{"rendered":"S\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u"},"content":{"rendered":"

S\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u: C\u00e1ch m\u00e0 c\u00e1c v\u1eadt li\u1ec7u m\u1ea5t nhi\u1ec7t theo th\u1eddi gian, \u1ea3nh h\u01b0\u1edfng c\u1ee7a suy gi\u1ea3m nhi\u1ec7t \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng trong k\u1ef9 thu\u1eadt nhi\u1ec7t.<\/p>\n

\"S\u1ef1<\/p>\n

S\u1ef1 Suy Gi\u1ea3m Nhi\u1ec7t c\u1ee7a V\u1eadt Li\u1ec7u<\/h2>\n

Trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t, m\u1ed9t trong nh\u1eefng kh\u00e1i ni\u1ec7m quan tr\u1ecdng m\u00e0 ch\u00fang ta c\u1ea7n hi\u1ec3u r\u00f5 l\u00e0 s\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u. \u0110\u00e2y l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng khi m\u1ed9t v\u1eadt li\u1ec7u m\u1ea5t \u0111i nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u00f3 qua th\u1eddi gian do s\u1ef1 truy\u1ec1n nhi\u1ec7t trong m\u00f4i tr\u01b0\u1eddng xung quanh. Hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y c\u00f3 th\u1ec3 gi\u00fap ch\u00fang ta \u1ee9ng d\u1ee5ng hi\u1ec7u qu\u1ea3 trong vi\u1ec7c thi\u1ebft k\u1ebf v\u00e0 c\u1ea3i ti\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng c\u00e1ch nhi\u1ec7t, h\u1ec7 th\u1ed1ng s\u01b0\u1edfi v\u00e0 l\u00e0m m\u00e1t.<\/p>\n

C\u01a1 Ch\u1ebf Truy\u1ec1n Nhi\u1ec7t<\/h2>\n

Truy\u1ec1n nhi\u1ec7t c\u00f3 th\u1ec3 x\u1ea3y ra theo ba c\u00e1ch kh\u00e1c nhau:<\/p>\n

<\/p>\n

  • D\u1eabn nhi\u1ec7t (Conduction):<\/strong> \u0110\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua m\u1ed9t v\u1eadt li\u1ec7u r\u1eafn t\u1eeb \u0111i\u1ec3m c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao \u0111\u1ebfn \u0111i\u1ec3m c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/li>\n
  • \u0110\u1ed1i l\u01b0u (Convection):<\/strong> \u0110\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed, khi c\u00e1c ph\u00e2n t\u1eed trong ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed di chuy\u1ec3n v\u00e0 mang theo nhi\u1ec7t l\u01b0\u1ee3ng.<\/li>\n
  • B\u1ee9c x\u1ea1 (Radiation):<\/strong> Qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t th\u00f4ng qua s\u00f3ng \u0111i\u1ec7n t\u1eeb, kh\u00f4ng c\u1ea7n m\u00f4i tr\u01b0\u1eddng v\u1eadt l\u00fd \u0111\u1ec3 truy\u1ec1n t\u1ea3i.<\/li>\n

    <\/u1><\/p>\n

    Ph\u01b0\u01a1ng Tr\u00ecnh Truy\u1ec1n Nhi\u1ec7t<\/h2>\n

    Ph\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n nhi\u1ec7t ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh d\u1eabn nhi\u1ec7t c\u1ee7a Fourier:<\/p>\n

    \\[
    \nq = -k \\nabla T
    \n\\]\n

    Trong \u0111\u00f3:<\/p>\n

    <\/p>\n

  • q:<\/strong> M\u1eadt \u0111\u1ed9 d\u00f2ng nhi\u1ec7t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng W\/m2<\/sup>.<\/li>\n
  • k:<\/strong> H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u, \u0111\u01a1n v\u1ecb l\u00e0 W\/mK.<\/li>\n
  • T:<\/strong> Nhi\u1ec7t \u0111\u1ed9, \u0111o b\u1eb1ng Kelvin (K) ho\u1eb7c \u0111\u1ed9 Celsius (\u00b0C).<\/li>\n
  • \u2207T:<\/strong> Gradient nhi\u1ec7t \u0111\u1ed9, bi\u1ec3u th\u1ecb s\u1ef1 thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 theo kho\u1ea3ng c\u00e1ch.<\/li>\n

    <\/u1><\/p>\n

    \u1ee8ng D\u1ee5ng Th\u1ef1c Ti\u1ec5n<\/h2>\n

    Hi\u1ec3u bi\u1ebft s\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c, ch\u1eb3ng h\u1ea1n:<\/p>\n

    <\/p>\n

  • H\u1ec7 th\u1ed1ng c\u00e1ch nhi\u1ec7t:<\/strong> S\u1eed d\u1ee5ng v\u1eadt li\u1ec7u c\u00f3 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t nh\u1ecf \u0111\u1ec3 gi\u1ea3m thi\u1ec3u m\u1ea5t nhi\u1ec7t qua t\u01b0\u1eddng, s\u00e0n v\u00e0 tr\u1ea7n nh\u00e0.<\/li>\n
  • Thi\u1ebft b\u1ecb \u0111i\u1ec7n l\u1ea1nh:<\/strong> T\u1ed1i \u01b0u h\u00f3a vi\u1ec7c l\u00e0m m\u00e1t b\u1eb1ng c\u00e1ch gi\u1ea3m thi\u1ec3u vi\u1ec7c truy\u1ec1n nhi\u1ec7t t\u1eeb b\u00ean ngo\u00e0i v\u00e0o b\u00ean trong t\u1ee7 l\u1ea1nh ho\u1eb7c \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed.<\/li>\n
  • Ng\u00e0nh c\u00f4ng nghi\u1ec7p s\u1ea3n xu\u1ea5t:<\/strong> B\u1ea3o qu\u1ea3n nhi\u1ec7t \u0111\u1ed9 trong c\u00e1c qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t nh\u01b0 nung ch\u1ea3y kim lo\u1ea1i, ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m.<\/li>\n

    <\/u1><\/p>\n

    L\u1ee3i \u00cdch c\u1ee7a Vi\u1ec7c Hi\u1ec3u R\u00f5 S\u1ef1 Suy Gi\u1ea3m Nhi\u1ec7t<\/h2>\n

    Vi\u1ec7c hi\u1ec3u r\u00f5 v\u00e0 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c s\u1ef1 suy gi\u1ea3m nhi\u1ec7t mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch l\u1edbn:<\/p>\n

    <\/p>\n

  • Ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng:<\/strong> Gi\u1ea3m thi\u1ec3u m\u1ea5t m\u00e1t nhi\u1ec7t n\u0103ng gi\u00fap ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c n\u0103ng l\u01b0\u1ee3ng ti\u00eau th\u1ee5.<\/li>\n
  • B\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng:<\/strong> Gi\u1ea3m l\u01b0\u1ee3ng kh\u00ed th\u1ea3i CO2<\/sub> t\u1eeb vi\u1ec7c s\u1eed d\u1ee5ng n\u0103ng l\u01b0\u1ee3ng kh\u00f4ng h\u1ee3p l\u00fd.<\/li>\n
  • N\u00e2ng cao hi\u1ec7u su\u1ea5t:<\/strong> H\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 h\u01a1n, gi\u1ea3m thi\u1ec3u chi ph\u00ed v\u1eadn h\u00e0nh v\u00e0 b\u1ea3o tr\u00ec.<\/li>\n

    <\/u1><\/p>\n

    T\u00f3m l\u1ea1i, s\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh trong nhi\u1ec1u \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt. Hi\u1ec3u r\u00f5 nguy\u00ean l\u00fd c\u01a1 b\u1ea3n v\u00e0 c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n nhi\u1ec7t gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf v\u00e0 c\u1ea3i ti\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u qu\u1ea3 h\u01a1n, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng.<\/p>\n","protected":false},"excerpt":{"rendered":"

    S\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u: C\u00e1ch m\u00e0 c\u00e1c v\u1eadt li\u1ec7u m\u1ea5t nhi\u1ec7t theo th\u1eddi gian, \u1ea3nh h\u01b0\u1edfng c\u1ee7a suy gi\u1ea3m nhi\u1ec7t \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng trong k\u1ef9 thu\u1eadt nhi\u1ec7t.<\/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":"\nS\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u<\/title>\n<meta name=\"description\" content=\"S\u1ef1 suy gi\u1ea3m nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u: C\u00e1ch m\u00e0 c\u00e1c v\u1eadt li\u1ec7u m\u1ea5t nhi\u1ec7t theo th\u1eddi gian, \u1ea3nh h\u01b0\u1edfng c\u1ee7a suy gi\u1ea3m nhi\u1ec7t \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng trong k\u1ef9 thu\u1eadt nhi\u1ec7t.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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