{"id":707094,"date":"2024-08-17T18:45:02","date_gmt":"2024-08-17T17:45:02","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=707094"},"modified":"2024-08-17T18:45:02","modified_gmt":"2024-08-17T17:45:02","slug":"tam-chan-chuc-nang-va-phan-phoi-dong-chay-trong-bo-trao-doi-nhiet","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/tam-chan-chuc-nang-va-phan-phoi-dong-chay-trong-bo-trao-doi-nhiet\/","title":{"rendered":"T\u1ea5m Ch\u1eafn | Ch\u1ee9c N\u0103ng v\u00e0 Ph\u00e2n Ph\u1ed1i D\u00f2ng Ch\u1ea3y trong B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">T\u1ea5m Ch\u1eafn | Ch\u1ee9c N\u0103ng v\u00e0 Ph\u00e2n Ph\u1ed1i D\u00f2ng Ch\u1ea3y trong B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t: Hi\u1ec3u r\u00f5 c\u00e1ch t\u1ea5m ch\u1eafn c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y trong c\u00e1c h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i nhi\u1ec7t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/tam_chan_chuc_nang_va_phan_phoi_dong_chay_trong_bo_trao_doi_nhiet.png\" alt=\"T\u1ea5m Ch\u1eafn | Ch\u1ee9c N\u0103ng v\u00e0 Ph\u00e2n Ph\u1ed1i D\u00f2ng Ch\u1ea3y trong B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>T\u1ea5m Ch\u1eafn | Ch\u1ee9c N\u0103ng v\u00e0 Ph\u00e2n Ph\u1ed1i D\u00f2ng Ch\u1ea3y trong B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t, gi\u00fap chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t gi\u1eefa hai hay nhi\u1ec1u ch\u1ea5t l\u01b0u m\u00e0 kh\u00f4ng \u0111\u1ec3 ch\u00fang ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u1edbi nhau. M\u1ed9t th\u00e0nh ph\u1ea7n quan tr\u1ecdng trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t l\u00e0 c\u00e1c t\u1ea5m ch\u1eafn (baffles). B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u1ea3i th\u00edch ch\u1ee9c n\u0103ng c\u1ee7a t\u1ea5m ch\u1eafn v\u00e0 c\u00e1ch ch\u00fang ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t.<\/p>\n<h2>Ch\u1ee9c N\u0103ng c\u1ee7a T\u1ea5m Ch\u1eafn<\/h2>\n<p>T\u1ea5m ch\u1eafn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t \u0111\u1ec3 \u0111\u1ecbnh h\u01b0\u1edbng v\u00e0 ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u01b0u. C\u00e1c ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a t\u1ea5m ch\u1eafn bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>\u0110\u1ecbnh h\u01b0\u1edbng d\u00f2ng ch\u1ea3y:<\/strong> T\u1ea5m ch\u1eafn gi\u00fap \u0111\u1ecbnh h\u01b0\u1edbng d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u01b0u, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ea5t l\u01b0u ch\u1ea3y qua c\u00e1c khu v\u1ef1c trao \u0111\u1ed5i nhi\u1ec7t hi\u1ec7u qu\u1ea3.<\/li>\n<li><strong>Gia t\u0103ng th\u1eddi gian trao \u0111\u1ed5i nhi\u1ec7t:<\/strong> B\u1eb1ng c\u00e1ch bu\u1ed9c ch\u1ea5t l\u01b0u thay \u0111\u1ed5i h\u01b0\u1edbng v\u00e0 \u0111i qua c\u00e1c con \u0111\u01b0\u1eddng ph\u1ee9c t\u1ea1p h\u01a1n, t\u1ea5m ch\u1eafn t\u0103ng c\u01b0\u1eddng th\u1eddi gian ch\u1ea5t l\u01b0u \u1edf l\u1ea1i trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t, gi\u00fap vi\u1ec7c truy\u1ec1n nhi\u1ec7t di\u1ec5n ra hi\u1ec7u qu\u1ea3 h\u01a1n.<\/li>\n<li><strong>Gi\u1ea3m thi\u1ec3u hi\u1ec7n t\u01b0\u1ee3ng t\u1eaft ngh\u1ebdn:<\/strong> T\u1ea5m ch\u1eafn gi\u00fap ph\u00e1 v\u1ee1 c\u00e1c d\u00f2ng ch\u1ea3y th\u1eb3ng v\u00e0 gi\u1ea3m thi\u1ec3u s\u1ef1 l\u1eafng \u0111\u1ecdng c\u1ee7a c\u00e1c h\u1ea1t c\u00f3 th\u1ec3 g\u00e2y t\u1eaft ngh\u1ebdn.<\/li>\n<\/ul>\n<h2>Ph\u00e2n Ph\u1ed1i D\u00f2ng Ch\u1ea3y<\/h2>\n<p>T\u1ea5m ch\u1eafn \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t, \u0111\u1ea3m b\u1ea3o vi\u1ec7c truy\u1ec1n nhi\u1ec7t \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00e1ch t\u1ea5m ch\u1eafn ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y:<\/p>\n<ul>\n<li><strong>D\u00f2ng ch\u1ea3y ch\u1eef S:<\/strong> \u0110\u00e2y l\u00e0 ki\u1ec3u ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y ph\u1ed5 bi\u1ebfn, n\u01a1i ch\u1ea5t l\u01b0u bu\u1ed9c ph\u1ea3i \u0111i qua nhi\u1ec1u \u0111o\u1ea1n u\u1ed1n kh\u00fac t\u1ea1o th\u00e0nh h\u00ecnh ch\u1eef S, gi\u00fap t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c truy\u1ec1n nhi\u1ec7t.<\/li>\n<li><strong>Thay \u0111\u1ed5i h\u01b0\u1edbng d\u00f2ng ch\u1ea3y:<\/strong> T\u1ea5m ch\u1eafn th\u01b0\u1eddng \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed sao cho ch\u1ea5t l\u01b0u ph\u1ea3i \u0111\u1ed5i h\u01b0\u1edbng nhi\u1ec1u l\u1ea7n khi ch\u1ea3y qua b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t, t\u1ea1o ra s\u1ef1 x\u00e1o tr\u1ed9n v\u00e0 t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t.<\/li>\n<\/ul>\n<h2>C\u00f4ng Th\u1ee9c T\u00ednh Hi\u1ec7u Su\u1ea5t c\u1ee7a B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t<\/h2>\n<p>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng c\u00e1c c\u00f4ng th\u1ee9c sau:<\/p>\n<p>Hi\u1ec7u su\u1ea5t \\(\\eta\\) \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng:<\/p>\n<p>\\(\\eta = \\frac{Q}{Q_{max}}\\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>Q l\u00e0 l\u01b0\u1ee3ng nhi\u1ec7t th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i.<\/li>\n<li>Q<sub>max<\/sub> l\u00e0 l\u01b0\u1ee3ng nhi\u1ec7t t\u1ed1i \u0111a c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy\u1ec1n t\u1ea3i.<\/li>\n<\/ul>\n<p>\u0110\u1ed1i v\u1edbi b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u1ea1ng \u1ed1ng l\u1ed3ng \u1ed1ng, c\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t \u0111\u1ec3 t\u00ednh l\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n t\u1ea3i l\u00e0:<\/p>\n<p>Q = U * A * \\Delta T<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>U l\u00e0 h\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t t\u1ed5ng c\u1ed9ng.<\/li>\n<li>A l\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t.<\/li>\n<li>\\(\\Delta T\\) l\u00e0 s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh gi\u1eefa hai ch\u1ea5t l\u01b0u.<\/li>\n<\/ul>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>T\u1ea5m ch\u1eafn l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t, \u0111\u1ea3m b\u1ea3o vi\u1ec7c ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y v\u00e0 t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t. Hi\u1ec3u r\u00f5 ch\u1ee9c n\u0103ng v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u1ea5m ch\u1eafn c\u00f3 th\u1ec3 gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t v\u00e0 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u1ea5m Ch\u1eafn | Ch\u1ee9c N\u0103ng v\u00e0 Ph\u00e2n Ph\u1ed1i D\u00f2ng Ch\u1ea3y trong B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t: Hi\u1ec3u r\u00f5 c\u00e1ch t\u1ea5m ch\u1eafn c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 ph\u00e2n ph\u1ed1i d\u00f2ng ch\u1ea3y trong c\u00e1c h\u1ec7 th\u1ed1ng trao \u0111\u1ed5i 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 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