{"id":679378,"date":"2024-11-14T17:55:26","date_gmt":"2024-11-14T16:55:26","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=679378"},"modified":"2024-11-14T17:55:26","modified_gmt":"2024-11-14T16:55:26","slug":"nhiet-dong-hoc-cua-viec-nau-an-bang-nhiet-cam-ung-la-gi","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/nhiet-dong-hoc-cua-viec-nau-an-bang-nhiet-cam-ung-la-gi\/","title":{"rendered":"Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng l\u00e0 g\u00ec?"},"content":{"rendered":"<p class=\"sidekick\">Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng: hi\u1ec3u c\u00e1ch m\u00e0 nhi\u1ec7t truy\u1ec1n t\u1eeb thi\u1ebft b\u1ecb \u0111\u1ebfn n\u1ed3i ch\u1ea3o \u0111\u1ec3 n\u1ea5u th\u1ee9c \u0103n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 v\u00e0 nhanh ch\u00f3ng.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/nhiet_dong_hoc_cua_viec_nau_an_bang_nhiet_cam_ung_la_gi.png\" alt=\"Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng l\u00e0 g\u00ec?\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng l\u00e0 g\u00ec?<\/h2>\n<p>Nhi\u1ec7t c\u1ea3m \u1ee9ng l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 n\u1ea5u \u0103n s\u1eed d\u1ee5ng nguy\u00ean l\u00fd t\u1eeb tr\u01b0\u1eddng \u0111\u1ec3 l\u00e0m n\u00f3ng n\u1ed3i v\u00e0 ch\u1ea3o. Kh\u00e1c v\u1edbi b\u1ebfp gas ho\u1eb7c b\u1ebfp \u0111i\u1ec7n, b\u1ebfp t\u1eeb ch\u1ec9 l\u00e0m n\u00f3ng ch\u00ednh d\u1ee5ng c\u1ee5 n\u1ea5u \u0103n, ch\u1ee9 kh\u00f4ng ph\u1ea3i to\u00e0n b\u1ed9 b\u1ec1 m\u1eb7t b\u1ebfp. H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u v\u1ec1 qu\u00e1 tr\u00ecnh nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc x\u1ea3y ra khi n\u1ea5u \u0103n b\u1eb1ng b\u1ebfp t\u1eeb.<\/p>\n<h2>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>B\u1ebfp t\u1eeb ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb. Khi d\u00f2ng \u0111i\u1ec7n t\u1ea7n s\u1ed1 cao ch\u1ea1y qua m\u1ed9t cu\u1ed9n d\u00e2y (coi nh\u01b0 cu\u1ed9n c\u1ea3m), n\u00f3 t\u1ea1o ra m\u1ed9t t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean. Khi m\u1ed9t n\u1ed3i ho\u1eb7c ch\u1ea3o kim lo\u1ea1i n\u1eb1m tr\u00ean b\u1ebfp, t\u1eeb tr\u01b0\u1eddng n\u00e0y s\u1ebd t\u00e1c \u0111\u1ed9ng v\u00e0o n\u1ed3i, t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u g\u1ecdi l\u00e0 d\u00f2ng \u0111i\u1ec7n Foucault trong n\u1ed3i. D\u00f2ng \u0111i\u1ec7n n\u00e0y, do t\u00e1c d\u1ee5ng c\u1ee7a \u0111i\u1ec7n tr\u1edf trong kim lo\u1ea1i, s\u1ebd chuy\u1ec3n th\u00e0nh nhi\u1ec7t n\u0103ng, l\u00e0m n\u00f3ng n\u1ed3i v\u00e0 n\u1ea5u ch\u00edn th\u1ee9c \u0103n b\u00ean trong.<\/p>\n<h2>C\u00e2n b\u1eb1ng nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc<\/h2>\n<ul>\n<li><strong>Qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t<\/strong>: Nhi\u1ec7t \u0111\u01b0\u1ee3c truy\u1ec1n t\u1eeb l\u1edbp kim lo\u1ea1i b\u00ean d\u01b0\u1edbi c\u1ee7a d\u1ee5ng c\u1ee5 n\u1ea5u (n\u1ed3i, ch\u1ea3o) t\u1edbi th\u1ee9c \u0103n. Khi n\u1ed3i, ch\u1ea3o \u0111\u1ea1t t\u1edbi nhi\u1ec7t \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh, qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t \u0111\u1ebfn th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c duy tr\u00ec.<\/li>\n<li><strong>\u0110\u1ecbnh lu\u1eadt Fourier v\u1ec1 d\u1eabn nhi\u1ec7t<\/strong>: Khi nhi\u1ec7t \u0111\u1ed9 t\u1ea1i \u0111i\u1ec3m g\u1ed1c t\u0103ng l\u00ean, nhi\u1ec7t s\u1ebd truy\u1ec1n \u0111\u1ed9ng theo ph\u01b0\u01a1ng tr\u00ecnh Fourier, \\( q = -k \\nabla T \\), trong \u0111\u00f3 \\( q \\) l\u00e0 nhi\u1ec7t l\u01b0\u1ee3ng, \\( k \\) l\u00e0 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t v\u00e0 \\( \\nabla T \\) l\u00e0 \u0111\u1ed9 d\u1ed1c nhi\u1ec7t \u0111\u1ed9.<\/li>\n<\/ul>\n<h2>L\u1ee3i \u00edch c\u1ee7a n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng<\/h2>\n<ul>\n<li><strong>Hi\u1ec7u su\u1ea5t cao<\/strong>: Nhi\u1ec7t c\u1ea3m \u1ee9ng r\u1ea5t hi\u1ec7u qu\u1ea3 v\u00ec \u00edt m\u1ea5t m\u00e1t nhi\u1ec7t n\u0103ng ra m\u00f4i tr\u01b0\u1eddng xung quanh. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m th\u1eddi gian n\u1ea5u v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng.<\/li>\n<li><strong>An to\u00e0n h\u01a1n<\/strong>: B\u1ebfp t\u1eeb kh\u00f4ng n\u00f3ng l\u00ean nhi\u1ec1u nh\u01b0 b\u1ebfp gas hay b\u1ebfp \u0111i\u1ec7n, gi\u1ea3m nguy c\u01a1 b\u1ecfng v\u00e0 ch\u00e1y n\u1ed5.<\/li>\n<li><strong>Ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 t\u1ed1t h\u01a1n<\/strong>: B\u1ebfp t\u1eeb c\u00f3 kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c, gi\u00fap tr\u00e1nh qu\u00e1 nhi\u1ec7t cho th\u1ee9c \u0103n.<\/li>\n<\/ul>\n<h2>H\u1ea1n ch\u1ebf c\u1ee7a nhi\u1ec7t c\u1ea3m \u1ee9ng<\/h2>\n<ul>\n<li><strong>D\u1ee5ng c\u1ee5 n\u1ea5u \u0103n gi\u1edbi h\u1ea1n<\/strong>: Ch\u1ec9 nh\u1eefng d\u1ee5ng c\u1ee5 n\u1ea5u \u0103n b\u1eb1ng kim lo\u1ea1i c\u00f3 t\u00ednh t\u1eeb (nh\u01b0 inox) m\u1edbi c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng tr\u00ean b\u1ebfp t\u1eeb.<\/li>\n<li><strong>Chi ph\u00ed ban \u0111\u1ea7u cao<\/strong>: B\u1ebfp t\u1eeb v\u00e0 d\u1ee5ng c\u1ee5 n\u1ea5u \u0103n cho b\u1ebfp t\u1eeb th\u01b0\u1eddng c\u00f3 gi\u00e1 th\u00e0nh cao h\u01a1n so v\u1edbi b\u1ebfp gas ho\u1eb7c b\u1ebfp \u0111i\u1ec7n th\u00f4ng th\u01b0\u1eddng.<\/li>\n<\/ul>\n<h2>\u0110\u1ecbnh lu\u1eadt nhi\u1ec7t \u0111\u1ed9ng l\u1ef1c h\u1ecdc<\/h2>\n<p>Trong qu\u00e1 tr\u00ecnh n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng, c\u00e1c \u0111\u1ecbnh lu\u1eadt nhi\u1ec7t \u0111\u1ed9ng l\u1ef1c h\u1ecdc v\u1eabn \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng:<\/p>\n<ol>\n<li><strong>\u0110\u1ecbnh lu\u1eadt th\u1ee9 nh\u1ea5t:<\/strong> N\u0103ng l\u01b0\u1ee3ng kh\u00f4ng t\u1ef1 \u0111\u1ed9ng sinh ra hay m\u1ea5t \u0111i, ch\u1ec9 chuy\u1ec3n t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c. Khi d\u00f2ng \u0111i\u1ec7n Foucault sinh ra t\u1eeb t\u1eeb tr\u01b0\u1eddng, n\u00f3 chuy\u1ec3n n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n th\u00e0nh nhi\u1ec7t n\u0103ng.<\/li>\n<li><strong>\u0110\u1ecbnh lu\u1eadt th\u1ee9 hai:<\/strong> M\u1ed9t h\u1ec7 th\u1ed1ng s\u1ebd t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n t\u1edbi tr\u1ea1ng th\u00e1i m\u1ea5t tr\u1eadt t\u1ef1 h\u01a1n. Khi nhi\u1ec7t sinh ra trong n\u1ed3i, n\u00f3 s\u1ebd ph\u00e2n ph\u1ed1i \u0111\u1ec1u kh\u1eafp n\u1ed3i theo qu\u00e1 tr\u00ecnh c\u00e2n b\u1eb1ng nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc.<\/li>\n<\/ol>\n<p>Hi\u1ec3u bi\u1ebft v\u1ec1 nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng gi\u00fap ch\u00fang ta s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n h\u01a1n, \u0111\u1ed3ng th\u1eddi t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh n\u1ea5u n\u01b0\u1edbng trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng: hi\u1ec3u c\u00e1ch m\u00e0 nhi\u1ec7t truy\u1ec1n t\u1eeb thi\u1ebft b\u1ecb \u0111\u1ebfn n\u1ed3i ch\u1ea3o \u0111\u1ec3 n\u1ea5u th\u1ee9c \u0103n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 v\u00e0 nhanh ch\u00f3ng.<\/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>Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng l\u00e0 g\u00ec?<\/title>\n<meta name=\"description\" content=\"Nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc c\u1ee7a vi\u1ec7c n\u1ea5u \u0103n b\u1eb1ng nhi\u1ec7t c\u1ea3m \u1ee9ng: hi\u1ec3u c\u00e1ch m\u00e0 nhi\u1ec7t truy\u1ec1n t\u1eeb thi\u1ebft b\u1ecb \u0111\u1ebfn n\u1ed3i ch\u1ea3o \u0111\u1ec3 n\u1ea5u th\u1ee9c \u0103n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 v\u00e0 nhanh ch\u00f3ng.\" \/>\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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