{"id":699521,"date":"2024-08-20T09:54:44","date_gmt":"2024-08-20T08:54:44","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699521"},"modified":"2024-08-20T09:54:44","modified_gmt":"2024-08-20T08:54:44","slug":"truyen-nhiet-trong-qua-trinh-len-men","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/truyen-nhiet-trong-qua-trinh-len-men\/","title":{"rendered":"Truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men"},"content":{"rendered":"<p class=\"sidekick\">Truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men gi\u00fap ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9, t\u1ed1i \u01b0u qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t, \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 hi\u1ec7u su\u1ea5t l\u00ean men trong c\u00f4ng nghi\u1ec7p th\u1ef1c ph\u1ea9m.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/truyen_nhiet_trong_qua_trinh_len_men.png\" alt=\"Truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Truy\u1ec1n Nhi\u1ec7t Trong Qu\u00e1 Tr\u00ecnh L\u00ean Men<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u qu\u1ea3 v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a qu\u00e1 tr\u00ecnh l\u00ean men. Qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u00f2i h\u1ecfi ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 ph\u00e1t tri\u1ec3n v\u00e0 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u01b0u c\u1ee7a vi sinh v\u1eadt. \u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men, ch\u00fang ta c\u1ea7n t\u00ecm hi\u1ec3u c\u00e1c c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t ch\u00ednh v\u00e0 vai tr\u00f2 c\u1ee7a ch\u00fang trong qu\u00e1 tr\u00ecnh n\u00e0y.<\/p>\n<h2>C\u01a1 Ch\u1ebf Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<ul>\n<li><strong>Truy\u1ec1n d\u1eabn nhi\u1ec7t (Conduction):<\/strong> \u0110\u00e2y l\u00e0 s\u1ef1 truy\u1ec1n nhi\u1ec7t qua v\u1eadt li\u1ec7u r\u1eafn ho\u1eb7c gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi nhau. Trong qu\u00e1 tr\u00ecnh l\u00ean men, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 di\u1ec5n ra gi\u1eefa th\u00e0nh b\u00ecnh ch\u1ee9a v\u00e0 m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i ho\u1eb7c gi\u1eefa c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a ch\u1ea5t l\u1ecfng l\u00ean men.<\/li>\n<li><strong>\u0110\u1ed1i l\u01b0u nhi\u1ec7t (Convection):<\/strong> Truy\u1ec1n nhi\u1ec7t qua ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed b\u00ean trong m\u00f4i tr\u01b0\u1eddng qu\u00e1 tr\u00ecnh l\u00ean men. N\u00f3 c\u00f3 th\u1ec3 l\u00e0 \u0111\u1ed1i l\u01b0u t\u1ef1 nhi\u00ean ho\u1eb7c \u0111\u1ed1i l\u01b0u c\u01b0\u1ee1ng b\u1ee9c, t\u00f9y thu\u1ed9c v\u00e0o s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 v\u00e0 s\u1ef1 khu\u1ea5y tr\u1ed9n b\u00ean trong.<\/li>\n<li><strong>B\u1ee9c x\u1ea1 nhi\u1ec7t (Radiation):<\/strong> Truy\u1ec1n nhi\u1ec7t qua kh\u00f4ng gian d\u01b0\u1edbi d\u1ea1ng s\u00f3ng \u0111i\u1ec7n t\u1eeb. D\u00f9 kh\u00f4ng ph\u1ed5 bi\u1ebfn nh\u01b0 hai c\u01a1 ch\u1ebf tr\u00ean, b\u1ee9c x\u1ea1 nhi\u1ec7t v\u1eabn c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh l\u00ean men khi c\u00e1c ngu\u1ed3n nhi\u1ec7t ho\u1eb7c b\u1ec1 m\u1eb7t b\u1ee9c x\u1ea1 nhi\u1ec7t \u0111\u1ed9t ng\u1ed9t xu\u1ea5t hi\u1ec7n.<\/li>\n<\/ul>\n<h2>\u1ea2nh H\u01b0\u1edfng C\u1ee7a Nhi\u1ec7t \u0110\u1ed9 \u0110\u1ebfn Qu\u00e1 Tr\u00ecnh L\u00ean Men<\/h2>\n<p>Nhi\u1ec7t \u0111\u1ed9 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 chuy\u1ec3n h\u00f3a sinh h\u1ecdc trong qu\u00e1 tr\u00ecnh l\u00ean men. N\u1ebfu nhi\u1ec7t \u0111\u1ed9 qu\u00e1 th\u1ea5p, vi sinh v\u1eadt ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng hi\u1ec7u qu\u1ea3, l\u00e0m gi\u1ea3m t\u1ed1c \u0111\u1ed9 l\u00ean men. Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu nhi\u1ec7t \u0111\u1ed9 qu\u00e1 cao, vi sinh v\u1eadt c\u00f3 th\u1ec3 b\u1ecb ch\u1ebft ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng h\u01b0 h\u1ea1i:<\/p>\n<ol>\n<li>\u1ede d\u1ea3i nhi\u1ec7t \u0111\u1ed9 t\u1ed1i \u01b0u, vi sinh v\u1eadt ph\u00e1t tri\u1ec3n v\u00e0 chuy\u1ec3n h\u00f3a nhanh ch\u00f3ng, t\u1ea1o ra s\u1ea3n ph\u1ea9m l\u00ean men mong mu\u1ed1n.<\/li>\n<li>Nhi\u1ec7t \u0111\u1ed9 qu\u00e1 th\u1ea5p d\u1eabn \u0111\u1ebfn qu\u00e1 tr\u00ecnh l\u00ean men ch\u1eadm h\u01a1n, k\u00e9o d\u00e0i th\u1eddi gian s\u1ea3n xu\u1ea5t v\u00e0 gia t\u0103ng nguy c\u01a1 \u00f4 nhi\u1ec5m.<\/li>\n<li>Nhi\u1ec7t \u0111\u1ed9 qu\u00e1 cao c\u00f3 th\u1ec3 l\u00e0m ch\u1ebft vi sinh v\u1eadt, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng.<\/li>\n<\/ol>\n<h2>C\u00f4ng Th\u1ee9c T\u00ednh To\u00e1n Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>Trong qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf v\u00e0 \u0111i\u1ec1u khi\u1ec3n h\u1ec7 th\u1ed1ng l\u00ean men, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n v\u00e0 ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9. M\u1ed9t c\u00f4ng th\u1ee9c quan tr\u1ecdng l\u00e0 c\u00f4ng th\u1ee9c truy\u1ec1n d\u1eabn nhi\u1ec7t:<\/p>\n<p>Q = k * A * (T\u2081 &#8211; T\u2082) \/ d<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>Q: L\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n (W)<\/li>\n<li>k: H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u (W\/m\u00b7K)<\/li>\n<li>A: Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac (m\u00b2)<\/li>\n<li>T\u2081 &#8211; T\u2082: S\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 (K)<\/li>\n<li>d: \u0110\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u (m)<\/li>\n<\/ul>\n<h2>\u1ee8ng D\u1ee5ng Trong Th\u1ef1c Ti\u1ec5n<\/h2>\n<p>Ki\u1ec3m so\u00e1t truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men r\u1ea5t quan tr\u1ecdng trong c\u00f4ng nghi\u1ec7p th\u1ef1c ph\u1ea9m, d\u01b0\u1ee3c ph\u1ea9m v\u00e0 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p sinh h\u1ecdc kh\u00e1c. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o nhi\u1ec7t \u0111\u1ed9 t\u1ed1i \u01b0u, c\u00e1c h\u1ec7 th\u1ed1ng l\u00ean men th\u01b0\u1eddng \u0111\u01b0\u1ee3c trang b\u1ecb:<\/p>\n<ul>\n<li><strong>H\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh:<\/strong> \u0110\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 th\u1ea5p cho nh\u1eefng qu\u00e1 tr\u00ecnh c\u1ea7n nhi\u1ec7t \u0111\u1ed9 m\u00e1t.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng gia nhi\u1ec7t:<\/strong> \u0110\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 cao cho nh\u1eefng qu\u00e1 tr\u00ecnh c\u1ea7n nhi\u1ec7t \u0111\u1ed9 \u1ea5m.<\/li>\n<li><strong>C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9:<\/strong> \u0110\u1ec3 theo d\u00f5i nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111i\u1ec1u ch\u1ec9nh h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh ho\u1eb7c gia nhi\u1ec7t theo y\u00eau c\u1ea7u.<\/li>\n<\/ul>\n<p>Th\u00f4ng qua s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t v\u00e0 \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh l\u00ean men, \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m v\u00e0 hi\u1ec7u su\u1ea5t s\u1ea3n xu\u1ea5t cao.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men gi\u00fap ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9, t\u1ed1i \u01b0u qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t, \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 hi\u1ec7u su\u1ea5t l\u00ean men trong c\u00f4ng nghi\u1ec7p th\u1ef1c ph\u1ea9m.<\/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>Truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men<\/title>\n<meta name=\"description\" content=\"Truy\u1ec1n nhi\u1ec7t trong qu\u00e1 tr\u00ecnh l\u00ean men 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