{"id":706100,"date":"2024-10-23T15:35:32","date_gmt":"2024-10-23T14:35:32","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=706100"},"modified":"2024-10-23T15:35:32","modified_gmt":"2024-10-23T14:35:32","slug":"bo-trao-doi-nhiet-xoan-oc-nho-gon-hieu-qua","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/bo-trao-doi-nhiet-xoan-oc-nho-gon-hieu-qua\/","title":{"rendered":"B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c | Nh\u1ecf g\u1ecdn, Hi\u1ec7u qu\u1ea3"},"content":{"rendered":"<p class=\"sidekick\">B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c: Nh\u1ecf g\u1ecdn, hi\u1ec7u qu\u1ea3 trong vi\u1ec7c trao \u0111\u1ed5i nhi\u1ec7t gi\u1eefa c\u00e1c ch\u1ea5t l\u1ecfng, ti\u1ebft ki\u1ec7m kh\u00f4ng gian v\u00e0 n\u00e2ng cao hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/bo_trao_doi_nhiet_xoan_oc_nho_gon_hieu_qua.png\" alt=\"B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c | Nh\u1ecf g\u1ecdn, Hi\u1ec7u qu\u1ea3\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c: Nh\u1ecf g\u1ecdn, Hi\u1ec7u qu\u1ea3<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb d\u00f9ng \u0111\u1ec3 truy\u1ec1n nhi\u1ec7t gi\u1eefa hai d\u00f2ng ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed m\u00e0 kh\u00f4ng cho ch\u00fang ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi nhau. \u0110\u00e2y l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p nhi\u1ec7t hi\u1ec7u qu\u1ea3 v\u00e0 ti\u1ebft ki\u1ec7m kh\u00f4ng gian, \u0111\u1eb7c bi\u1ec7t ph\u1ed5 bi\u1ebfn trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p nh\u01b0 h\u00f3a ch\u1ea5t, d\u1ea7u kh\u00ed, v\u00e0 n\u0103ng l\u01b0\u1ee3ng.<\/p>\n<h3>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c<\/h3>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c g\u1ed3m hai \u1ed1ng xo\u1eafn \u1ed1c \u0111\u01b0\u1ee3c xen k\u1ebd, cho ph\u00e9p hai d\u00f2ng ch\u1ea3y \u0111\u1ed1i l\u01b0u v\u1edbi nhau. M\u1ed9t d\u00f2ng ch\u1ea3y qua \u1ed1ng b\u00ean trong, trong khi d\u00f2ng c\u00f2n l\u1ea1i ch\u1ea3y qua \u1ed1ng b\u00ean ngo\u00e0i.<\/p>\n<ul>\n<li>M\u1ed9t d\u00f2ng ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed s\u1ebd \u0111\u01b0\u1ee3c d\u1eabn qua \u1ed1ng xo\u1eafn b\u00ean trong.<\/li>\n<li>D\u00f2ng ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed th\u1ee9 hai s\u1ebd \u0111i qua k\u00eanh xo\u1eafn \u1ed1c b\u00ean ngo\u00e0i, bao quanh \u1ed1ng xo\u1eafn b\u00ean trong.<\/li>\n<li>Nhi\u1ec7t t\u1eeb d\u00f2ng \u1ea5m h\u01a1n s\u1ebd truy\u1ec1n qua v\u1eadt li\u1ec7u \u1ed1ng v\u00e0 \u0111\u01b0\u1ee3c h\u1ea5p th\u1ee5 b\u1edfi d\u00f2ng m\u00e1t h\u01a1n, nh\u01b0ng hai d\u00f2ng kh\u00f4ng bao gi\u1edd ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp.<\/li>\n<\/ul>\n<p>Nguy\u00ean l\u00fd n\u00e0y t\u1ea1o ra m\u1ed9t h\u1ec7 th\u1ed1ng truy\u1ec1n nhi\u1ec7t hi\u1ec7u qu\u1ea3 do di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m d\u00f2ng ch\u1ea3y xo\u1eafn \u1ed1c, gi\u00fap t\u0103ng c\u01b0\u1eddng hi\u1ec7u su\u1ea5t trao \u0111\u1ed5i nhi\u1ec7t.<\/p>\n<h3>\u01afu \u0111i\u1ec3m c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c<\/h3>\n<ul>\n<li>Nh\u1ecf g\u1ecdn: Thi\u1ebft k\u1ebf xo\u1eafn \u1ed1c gi\u00fap ti\u1ebft ki\u1ec7m kh\u00f4ng gian so v\u1edbi c\u00e1c b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t truy\u1ec1n th\u1ed1ng.<\/li>\n<li>Hi\u1ec7u qu\u1ea3 cao: Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac l\u1edbn gi\u00fap t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t.<\/li>\n<li>\u00c1p su\u1ea5t th\u1ea5p: Thi\u1ebft k\u1ebf d\u00f2ng ch\u1ea3y li\u00ean t\u1ee5c gi\u1ea3m thi\u1ec3u t\u1ed5n hao \u00e1p su\u1ea5t.<\/li>\n<li>D\u1ec5 d\u00e0ng b\u1ea3o tr\u00ec v\u00e0 v\u1ec7 sinh: C\u1ea5u tr\u00fac \u0111\u01a1n gi\u1ea3n cho ph\u00e9p d\u1ec5 d\u00e0ng th\u00e1o l\u1eafp v\u00e0 l\u00e0m s\u1ea1ch.<\/li>\n<\/ul>\n<h3>\u1ee8ng d\u1ee5ng trong th\u1ef1c ti\u1ec5n<\/h3>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau:<\/p>\n<ol>\n<li><strong>N\u1ed3i h\u01a1i v\u00e0 h\u1ec7 th\u1ed1ng s\u01b0\u1edfi \u1ea5m:<\/strong> \u0110\u1ec3 gia nhi\u1ec7t n\u01b0\u1edbc tr\u01b0\u1edbc khi n\u1ea1p v\u00e0o n\u1ed3i h\u01a1i.<\/li>\n<li><strong>Ng\u00e0nh c\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t:<\/strong> Trong c\u00e1c qu\u00e1 tr\u00ecnh ph\u1ea3n \u1ee9ng c\u1ea7n ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9.<\/li>\n<li><strong>Ng\u00e0nh d\u1ea7u kh\u00ed:<\/strong> \u0110\u1ec3 gia nhi\u1ec7t ho\u1eb7c l\u00e0m l\u1ea1nh d\u1ea7u v\u00e0 kh\u00ed t\u1ef1 nhi\u00ean.<\/li>\n<li><strong>\u0110i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed:<\/strong> V\u1edbi vai tr\u00f2 b\u1ed9 l\u00e0m l\u1ea1nh ho\u1eb7c gia nhi\u1ec7t kh\u00f4ng kh\u00ed.<\/li>\n<\/ol>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n hi\u1ec7u su\u1ea5t trao \u0111\u1ed5i nhi\u1ec7t<\/h3>\n<p>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n d\u1ef1a tr\u00ean ph\u01b0\u01a1ng tr\u00ecnh trao \u0111\u1ed5i nhi\u1ec7t:<\/p>\n<p>\\[ Q = U \\cdot A \\cdot \\Delta T_{mean} \\]\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>Q: L\u01b0\u1ee3ng nhi\u1ec7t trao \u0111\u1ed5i (W).<\/li>\n<li>U: H\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t t\u1ed5ng (W\/m<sup>2<\/sup>*K).<\/li>\n<li>A: Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t (m<sup>2<\/sup>).<\/li>\n<li>&Delta;T<sub>mean<\/sub>: Hi\u1ec7u s\u1ed1 nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh logarit (K).<\/li>\n<\/ul>\n<h3>K\u1ebft lu\u1eadn<\/h3>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p tuy\u1ec7t v\u1eddi cho c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p c\u1ea7n t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t nhi\u1ec7t v\u00e0 gi\u1ea3m thi\u1ec3u di\u1ec7n t\u00edch l\u1eafp \u0111\u1eb7t. V\u1edbi c\u1ea5u tr\u00fac \u0111\u01a1n gi\u1ea3n nh\u01b0ng hi\u1ec7u qu\u1ea3, thi\u1ebft b\u1ecb n\u00e0y \u0111ang ng\u00e0y c\u00e0ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i, \u0111em l\u1ea1i l\u1ee3i \u00edch kinh t\u1ebf v\u00e0 k\u1ef9 thu\u1eadt to l\u1edbn.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn \u1ed1c: Nh\u1ecf g\u1ecdn, hi\u1ec7u qu\u1ea3 trong vi\u1ec7c trao \u0111\u1ed5i nhi\u1ec7t gi\u1eefa c\u00e1c ch\u1ea5t l\u1ecfng, ti\u1ebft ki\u1ec7m kh\u00f4ng gian v\u00e0 n\u00e2ng cao hi\u1ec7u su\u1ea5t truy\u1ec1n 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":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t xo\u1eafn 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