{"id":702176,"date":"2024-09-11T10:13:35","date_gmt":"2024-09-11T09:13:35","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=702176"},"modified":"2024-09-11T10:13:35","modified_gmt":"2024-09-11T09:13:35","slug":"toi-uu-hoa-truyen-nhiet-trong-cac-quy-trinh-cong-nghiep","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/toi-uu-hoa-truyen-nhiet-trong-cac-quy-trinh-cong-nghiep\/","title":{"rendered":"T\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p"},"content":{"rendered":"<p class=\"sidekick\">T\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 gi\u1ea3m chi ph\u00ed s\u1ea3n xu\u1ea5t th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng ph\u00e1p k\u1ef9 thu\u1eadt ti\u00ean ti\u1ebfn.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/toi_uu_hoa_truyen_nhiet_trong_cac_quy_trinh_cong_nghiep.png\" alt=\"T\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>T\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p, \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 n\u0103ng l\u01b0\u1ee3ng ti\u00eau th\u1ee5. T\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t kh\u00f4ng ch\u1ec9 gi\u00fap ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng m\u00e0 c\u00f2n gi\u1ea3m thi\u1ec3u chi ph\u00ed s\u1ea3n xu\u1ea5t v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng.<\/p>\n<h2>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n nhi\u1ec7t<\/h2>\n<p>C\u00f3 ba ph\u01b0\u01a1ng ph\u00e1p ch\u00ednh \u0111\u1ec3 truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p:<\/p>\n<p><u1><\/p>\n<li><b>D\u1eabn nhi\u1ec7t (Conduction):<\/b> Truy\u1ec1n nhi\u1ec7t qua v\u1eadt li\u1ec7u r\u1eafn. \u0110\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng \u0111\u1ecbnh lu\u1eadt Fourier:<\/li>\n<p>\n        \\[<br \/>\n        q = -k \\frac{\\Delta T}{\\Delta x}<br \/>\n        \\]\n        <br \/>\n        Trong \u0111\u00f3: \\(q\\) l\u00e0 d\u00f2ng nhi\u1ec7t, \\(k\\) l\u00e0 \u0111\u1ed9 d\u1eabn nhi\u1ec7t, \\(\\Delta T\\) l\u00e0 s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 v\u00e0 \\(\\Delta x\\) l\u00e0 \u0111\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u.\n    <\/p>\n<li><b>\u0110\u1ed1i l\u01b0u (Convection):<\/b> Truy\u1ec1n nhi\u1ec7t qua c\u00e1c ch\u1ea5t l\u1ecfng v\u00e0 kh\u00ed th\u00f4ng qua d\u00f2ng ch\u1ea3y. \u0110\u01b0\u1ee3c m\u00f4 t\u1ea3 b\u1edfi \u0111\u1ecbnh lu\u1eadt Newton v\u1ec1 l\u00e0m m\u00e1t:<\/li>\n<p>\n        \\[<br \/>\n        q = hA(T_s &#8211; T_\\infty)<br \/>\n        \\]\n        <br \/>\n        Trong \u0111\u00f3: \\(q\\) l\u00e0 d\u00f2ng nhi\u1ec7t, \\(h\\) l\u00e0 h\u1ec7 s\u1ed1 \u0111\u1ed1i l\u01b0u, \\(A\\) l\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t, \\(T_s\\) l\u00e0 nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t v\u00e0 \\(T_\\infty\\) l\u00e0 nhi\u1ec7t \u0111\u1ed9 ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed xung quanh.\n    <\/p>\n<li><b>B\u1ee9c x\u1ea1 (Radiation):<\/b> Truy\u1ec1n nhi\u1ec7t qua kh\u00f4ng gian m\u00e0 kh\u00f4ng c\u1ea7n m\u00f4i ch\u1ea5t. \u0110\u01b0\u1ee3c m\u00f4 t\u1ea3 b\u1edfi \u0111\u1ecbnh lu\u1eadt Stefan-Boltzmann:<\/li>\n<p>\n        \\[<br \/>\n        q = \\epsilon \\sigma A (T_s^4 &#8211; T_\\infty^4)<br \/>\n        \\]\n        <br \/>\n        Trong \u0111\u00f3: \\(\\epsilon\\) l\u00e0 \u0111\u1ed9 ph\u00e1t x\u1ea1, \\(\\sigma\\) l\u00e0 h\u1eb1ng s\u1ed1 Stefan-Boltzmann, \\(A\\) l\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t, \\(T_s\\) v\u00e0 \\(T_\\infty\\) gi\u1ed1ng nh\u01b0 c\u00e1c bi\u1ebfn s\u1ed1 trong \u0111\u1ed1i l\u01b0u.\n    <\/p>\n<p><\/u1><\/p>\n<h2>Chi\u1ebfn l\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t<\/h2>\n<p><u1><\/p>\n<li><b>S\u1eed d\u1ee5ng v\u1eadt li\u1ec7u c\u00f3 \u0111\u1eb7c t\u00ednh d\u1eabn nhi\u1ec7t cao:<\/b> V\u1eadt li\u1ec7u nh\u01b0 \u0111\u1ed3ng v\u00e0 nh\u00f4m c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao, gi\u00fap t\u0103ng c\u01b0\u1eddng hi\u1ec7u qu\u1ea3 truy\u1ec1n nhi\u1ec7t.<\/li>\n<li><b>Thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i nhi\u1ec7t hi\u1ec7u qu\u1ea3:<\/b> S\u1eed d\u1ee5ng b\u1ed9 \u0111\u1ed5i nhi\u1ec7t d\u1ea1ng v\u00e2y, \u1ed1ng xo\u1eafn ho\u1eb7c t\u1ea5m \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a di\u1ec7n t\u00edch ti\u1ebfp x\u00fac.<\/li>\n<li><b>\u00c1p d\u1ee5ng c\u00e1ch nhi\u1ec7t:<\/b> C\u00e1ch nhi\u1ec7t gi\u00fap gi\u1ea3m thi\u1ec3u m\u1ea5t nhi\u1ec7t kh\u00f4ng mong mu\u1ed1n, gi\u1eef nhi\u1ec7t \u0111\u1ed9 trong h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh h\u01a1n.<\/li>\n<li><b>Qu\u1ea3n l\u00fd l\u01b0u l\u01b0\u1ee3ng d\u00f2ng ch\u1ea3y:<\/b> T\u0103ng c\u01b0\u1eddng t\u1ed1c \u0111\u1ed9 ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed c\u00f3 th\u1ec3 t\u0103ng hi\u1ec7u qu\u1ea3 truy\u1ec1n nhi\u1ec7t do t\u0103ng c\u01b0\u1eddng c\u01a1 ch\u1ebf \u0111\u1ed1i l\u01b0u.<\/li>\n<p><\/u1><\/p>\n<h2>\u1ee8ng d\u1ee5ng th\u1ef1c ti\u1ec5n<\/h2>\n<p>C\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p nh\u01b0 ch\u01b0ng c\u1ea5t, s\u1ea5y kh\u00f4, l\u00e0m l\u1ea1nh, v\u00e0 trao \u0111\u1ed5i nhi\u1ec7t trong nh\u00e0 m\u00e1y \u0111i\u1ec7n \u0111\u1ec1u c\u1ea7n t\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t cao nh\u1ea5t. V\u00ed d\u1ee5, trong nh\u00e0 m\u00e1y \u0111i\u1ec7n, qu\u00e1 tr\u00ecnh t\u1ea1o h\u01a1i n\u01b0\u1edbc t\u1eeb n\u01b0\u1edbc qua b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t ph\u1ea3i \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 gi\u1ea3m th\u1ea5t tho\u00e1t n\u0103ng l\u01b0\u1ee3ng v\u00e0 t\u0103ng hi\u1ec7u qu\u1ea3 s\u1eed d\u1ee5ng nhi\u00ean li\u1ec7u.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p l\u00e0 c\u1ef1c k\u1ef3 quan tr\u1ecdng \u0111\u1ec3 n\u00e2ng cao hi\u1ec7u su\u1ea5t v\u00e0 gi\u1ea3m chi ph\u00ed. B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 chi\u1ebfn l\u01b0\u1ee3c \u0111\u00e3 n\u00eau, c\u00e1c doanh nghi\u1ec7p c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 trong hi\u1ec7u su\u1ea5t s\u1ea3n xu\u1ea5t v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u1ed1i \u01b0u h\u00f3a truy\u1ec1n nhi\u1ec7t trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 gi\u1ea3m chi ph\u00ed s\u1ea3n xu\u1ea5t th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng ph\u00e1p k\u1ef9 thu\u1eadt ti\u00ean ti\u1ebfn.<\/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 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