{"id":699951,"date":"2024-11-05T01:18:25","date_gmt":"2024-11-05T00:18:25","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699951"},"modified":"2024-11-05T01:18:25","modified_gmt":"2024-11-05T00:18:25","slug":"toi-uu-hoa-bo-trao-doi-nhiet-vi-kenh","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/toi-uu-hoa-bo-trao-doi-nhiet-vi-kenh\/","title":{"rendered":"T\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh"},"content":{"rendered":"<p class=\"sidekick\">T\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh: ph\u00e2n t\u00edch ph\u01b0\u01a1ng ph\u00e1p n\u00e2ng cao hi\u1ec7u su\u1ea5t l\u00e0m m\u00e1t v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng trong c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/toi_uu_hoa_bo_trao_doi_nhiet_vi_kenh.png\" alt=\"T\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>T\u1ed1i \u01afu H\u00f3a B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t Vi K\u00eanh<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh (microchannel heat exchanger) \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u h\u1ec7 th\u1ed1ng nhi\u1ec7t, t\u1eeb \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed hi\u1ec7u su\u1ea5t cao. T\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh kh\u00f4ng ch\u1ec9 gi\u00fap n\u00e2ng cao hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t m\u00e0 c\u00f2n ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 gi\u1ea3m thi\u1ec3u k\u00edch th\u01b0\u1edbc c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n<h2>C\u1ea5u Tr\u00fac Vi K\u00eanh<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh th\u01b0\u1eddng c\u00f3 c\u1ea5u tr\u00fac bao g\u1ed3m nhi\u1ec1u k\u00eanh nh\u1ecf, th\u01b0\u1eddng c\u00f3 k\u00edch th\u01b0\u1edbc t\u1eeb micromet \u0111\u1ebfn millimet, gi\u00fap t\u0103ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac v\u1edbi m\u00f4i ch\u1ea5t. Vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 thi\u1ebft k\u1ebf c\u1ea5u tr\u00fac vi k\u00eanh ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t m\u1ed9t c\u00e1ch \u0111\u00e1ng k\u1ec3.<\/p>\n<ul>\n<li>K\u00eanh \u0111\u01a1n: C\u00e1c k\u00eanh \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 s\u1ea3n xu\u1ea5t.<\/li>\n<li>K\u00eanh ph\u1ee9c t\u1ea1p: C\u00e1c k\u00eanh c\u00f3 h\u00ecnh d\u1ea1ng ph\u1ee9c t\u1ea1p h\u01a1n \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a lu\u1ed3ng ch\u1ea5t l\u1ecfng v\u00e0 truy\u1ec1n nhi\u1ec7t.<\/li>\n<\/ul>\n<h2>Nguy\u00ean L\u00fd Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh ch\u1ee7 y\u1ebfu th\u00f4ng qua ba c\u01a1 ch\u1ebf:<\/p>\n<ol>\n<li>Truy\u1ec1n d\u1eabn nhi\u1ec7t (conduction): Nhi\u1ec7t \u0111\u01b0\u1ee3c truy\u1ec1n qua c\u00e1c th\u00e0nh c\u1ee7a k\u00eanh.<\/li>\n<li>\u0110\u1ed1i l\u01b0u nhi\u1ec7t (convection): N\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t \u0111\u01b0\u1ee3c chuy\u1ec3n t\u1eeb m\u00f4i ch\u1ea5t n\u00f3ng sang m\u00f4i ch\u1ea5t l\u1ea1nh.<\/li>\n<li>B\u1ee9c x\u1ea1 nhi\u1ec7t (radiation): M\u1eb7c d\u00f9 \u00edt ph\u1ed5 bi\u1ebfn trong vi k\u00eanh nh\u01b0ng v\u1eabn c\u1ea7n t\u00ednh \u0111\u1ebfn.<\/li>\n<\/ol>\n<h2>C\u00e1c Y\u1ebfu T\u1ed1 T\u1ed1i \u01afu H\u00f3a<\/h2>\n<p>\u0110\u1ec3 t\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh, c\u00e1c k\u1ef9 s\u01b0 t\u1eadp trung v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1 kh\u00e1c nhau nh\u1eb1m t\u1ed1i \u0111a h\u00f3a hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t v\u00e0 t\u1ed1i thi\u1ec3u h\u00f3a n\u0103ng l\u01b0\u1ee3ng ti\u00eau t\u1ed1n. C\u00e1c y\u1ebfu t\u1ed1 n\u00e0y bao g\u1ed3m:<\/p>\n<ul>\n<li>H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc k\u00eanh: \u0110\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 t\u0103ng di\u1ec7n t\u00edch ti\u1ebfp x\u00fac v\u00e0 gi\u1ea3m tr\u1edf l\u1ef1c.<\/li>\n<li>V\u1eadt li\u1ec7u ch\u1ebf t\u1ea1o: Ch\u1ecdn c\u00e1c v\u1eadt li\u1ec7u c\u00f3 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t cao nh\u01b0 \u0111\u1ed3ng ho\u1eb7c nh\u00f4m.<\/li>\n<li>L\u01b0u l\u01b0\u1ee3ng m\u00f4i ch\u1ea5t: \u0110i\u1ec1u ch\u1ec9nh l\u01b0u l\u01b0\u1ee3ng sao cho \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t t\u1ed1i \u01b0u.<\/li>\n<\/ul>\n<h2>Ph\u01b0\u01a1ng Ph\u00e1p T\u00ednh To\u00e1n<\/h2>\n<p>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n v\u00e0 m\u00f4 ph\u1ecfng c\u1ea5u tr\u00fac vi k\u00eanh gi\u00fap d\u1ef1 b\u00e1o hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t tr\u01b0\u1edbc khi s\u1ea3n xu\u1ea5t. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ul>\n<li>Ph\u01b0\u01a1ng ph\u00e1p s\u1ed1: S\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m m\u00f4 ph\u1ecfng nh\u01b0 ANSYS Fluent.<\/li>\n<li>Ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch: S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c truy\u1ec1n nhi\u1ec7t nh\u01b0 ph\u01b0\u01a1ng tr\u00ecnh Nusselt ho\u1eb7c ph\u01b0\u01a1ng tr\u00ecnh Reynolds \u0111\u1ec3 t\u00ednh to\u00e1n. V\u00ed d\u1ee5:<\/li>\n<\/ul>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh Nusselt cho s\u1ed1 Reynolds th\u1ea5p:<\/p>\n<p>\\[<br \/>\nNu = C \\cdot Re^{m} \\cdot Pr^{n}<br \/>\n\\]\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><i>Nu<\/i>: S\u1ed1 Nusselt, \u0111\u1ea1i di\u1ec7n cho t\u1ef7 l\u1ec7 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u so v\u1edbi d\u1eabn nhi\u1ec7t.<\/li>\n<li><i>Re<\/i>: S\u1ed1 Reynolds, \u0111\u1ea1i di\u1ec7n cho t\u00ednh ch\u1ea5t d\u00f2ng ch\u1ea3y.<\/li>\n<li><i>Pr<\/i>: S\u1ed1 Prandtl, t\u1ef7 l\u1ec7 gi\u1eefa \u0111\u1ed9ng su\u1ea5t v\u00e0 nhi\u1ec7t su\u1ea5t c\u1ee7a m\u00f4i ch\u1ea5t.<\/li>\n<\/ul>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>T\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh ph\u1ee9c t\u1ea1p nh\u01b0ng quan tr\u1ecdng, gi\u00fap n\u00e2ng cao hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng. B\u1eb1ng c\u00e1ch l\u1ef1a ch\u1ecdn c\u1ea5u tr\u00fac k\u00eanh ph\u00f9 h\u1ee3p, v\u1eadt li\u1ec7u ch\u1ea5t l\u01b0\u1ee3ng cao v\u00e0 \u0111i\u1ec1u ch\u1ec9nh l\u01b0u l\u01b0\u1ee3ng m\u00f4i ch\u1ea5t, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t hi\u1ec7u qu\u1ea3 cho nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u1ed1i \u01b0u h\u00f3a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t vi k\u00eanh: ph\u00e2n t\u00edch ph\u01b0\u01a1ng ph\u00e1p n\u00e2ng cao hi\u1ec7u su\u1ea5t l\u00e0m m\u00e1t v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng trong c\u00e1c h\u1ec7 th\u1ed1ng 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 - 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