{"id":699732,"date":"2024-11-23T21:12:12","date_gmt":"2024-11-23T20:12:12","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699732"},"modified":"2024-11-23T21:12:12","modified_gmt":"2024-11-23T20:12:12","slug":"thiet-ke-bo-trao-doi-nhiet-dong-cheo","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/thiet-ke-bo-trao-doi-nhiet-dong-cheo\/","title":{"rendered":"Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o"},"content":{"rendered":"<p class=\"sidekick\">Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o: H\u01b0\u1edbng d\u1eabn c\u01a1 b\u1ea3n v\u1ec1 c\u1ea5u tr\u00fac, nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o trong c\u00f4ng nghi\u1ec7p.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/thiet_ke_bo_trao_doi_nhiet_dong_cheo.png\" alt=\"Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Thi\u1ebft K\u1ebf B\u1ed9 Trao \u0110\u1ed5i Nhi\u1ec7t D\u00f2ng Ch\u00e9o<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t l\u00e0 thi\u1ebft b\u1ecb ph\u1ed5 bi\u1ebfn trong ng\u00e0nh nhi\u1ec7t k\u1ef9 thu\u1eadt, d\u00f9ng \u0111\u1ec3 chuy\u1ec3n nhi\u1ec7t t\u1eeb m\u1ed9t ch\u1ea5t l\u1ecfng n\u00e0y sang m\u1ed9t ch\u1ea5t l\u1ecfng kh\u00e1c. Trong \u0111\u00f3, b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o l\u00e0 m\u1ed9t d\u1ea1ng \u0111\u1eb7c bi\u1ec7t, n\u01a1i hai d\u00f2ng ch\u1ea5t l\u1ecfng ch\u1ea3y vu\u00f4ng g\u00f3c v\u1edbi nhau. Vi\u1ec7c thi\u1ebft k\u1ebf sao cho b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi c\u00e1c k\u1ef9 s\u01b0 ph\u1ea3i hi\u1ec3u r\u00f5 c\u1ea3 l\u00fd thuy\u1ebft l\u1eabn th\u1ef1c h\u00e0nh.<\/p>\n<h2>C\u01a1 Ch\u1ebf Ho\u1ea1t \u0110\u1ed9ng<\/h2>\n<p>Trong b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o, m\u1ed9t d\u00f2ng ch\u1ea5t l\u1ecfng ch\u1ea3y ngang qua m\u1ed9t lo\u1ea1t c\u00e1c \u1ed1ng ho\u1eb7c t\u1ea5m ch\u1ee9a d\u00f2ng ch\u1ea5t l\u1ecfng th\u1ee9 hai. C\u01a1 ch\u1ebf n\u00e0y t\u1ea1o ra s\u1ef1 trao \u0111\u1ed5i nhi\u1ec7t hi\u1ec7u qu\u1ea3 h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t kh\u00e1c nh\u1edd v\u00e0o di\u1ec7n t\u00edch ti\u1ebfp x\u00fac l\u1edbn gi\u1eefa hai d\u00f2ng ch\u1ea5t l\u1ecfng.<\/p>\n<ul>\n<li><b>D\u00f2ng ch\u1ea3y m\u1ed9t pha:<\/b> Khi c\u1ea3 hai ch\u1ea5t l\u1ecfng \u0111\u1ec1u \u1edf c\u00f9ng m\u1ed9t pha (ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed), vi\u1ec7c trao \u0111\u1ed5i nhi\u1ec7t ch\u1ee7 y\u1ebfu d\u1ef1a v\u00e0o s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9.<\/li>\n<li><b>D\u00f2ng ch\u1ea3y hai pha:<\/b> Khi m\u1ed9t trong hai ch\u1ea5t l\u1ecfng ho\u1eb7c c\u1ea3 hai chuy\u1ec3n \u0111\u1ed5i gi\u1eefa hai pha (ch\u1ea5t l\u1ecfng v\u00e0 kh\u00ed), vi\u1ec7c trao \u0111\u1ed5i nhi\u1ec7t ph\u1ee9c t\u1ea1p h\u01a1n, \u1ea3nh h\u01b0\u1edfng t\u1edbi hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n<h2>C\u00e1c Th\u00f4ng S\u1ed1 Thi\u1ebft K\u1ebf<\/h2>\n<p>Qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o bao g\u1ed3m vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c th\u00f4ng s\u1ed1 c\u01a1 b\u1ea3n sau:<\/p>\n<ol>\n<li><b>D\u00f2ng nhi\u1ec7t:<\/b> Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n trao \u0111\u1ed5i gi\u1eefa hai d\u00f2ng ch\u1ea5t l\u1ecfng, k\u00fd hi\u1ec7u \\(\\dot{Q}\\), \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c:<br \/>\n  \\[<br \/>\n  \\dot{Q} = U \\cdot A \\cdot \\Delta T_m<br \/>\n  \\]\n  Trong \u0111\u00f3, \\(U\\) l\u00e0 h\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t t\u1ed5ng c\u1ed9ng, \\(A\\) l\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t, v\u00e0 \\(\\Delta T_m\\) l\u00e0 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh.<\/li>\n<li><b>Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t:<\/b> Di\u1ec7n t\u00edch n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o ki\u1ec3u thi\u1ebft k\u1ebf, lo\u1ea1i v\u1eadt li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t. C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch l\u00e0:<br \/>\n  \\[<br \/>\n  A = \\frac{\\dot{Q}}{U \\cdot \\Delta T_m}<br \/>\n  \\]<\/li>\n<li><b>Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh:<\/b> \u0110\u1ed1i v\u1edbi d\u00f2ng ch\u00e9o, ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh hi\u1ec7u d\u1ee5ng \u0111\u01b0\u1ee3c t\u00ednh g\u1ea7n \u0111\u00fang b\u1eb1ng:<br \/>\n  \\[<br \/>\n  \\Delta T_m = \\frac{\\Delta T_1 &#8211; \\Delta T_2}{\\ln\\left( \\frac{\\Delta T_1}{\\Delta T_2} \\right)}<br \/>\n  \\]\n  v\u1edbi \\(\\Delta T_1\\) v\u00e0 \\(\\Delta T_2\\) l\u1ea7n l\u01b0\u1ee3t l\u00e0 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 \u0111\u1ea7u v\u00e0o v\u00e0 \u0111\u1ea7u ra c\u1ee7a hai d\u00f2ng ch\u1ea5t l\u1ecfng.<\/li>\n<\/ol>\n<h2>\u1ee8ng D\u1ee5ng Th\u1ef1c T\u1ebf<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c c\u00f4ng nghi\u1ec7p nh\u01b0:<\/p>\n<ul>\n<li><b>Ng\u00e0nh \u0111i\u1ec7n l\u1ef1c:<\/b> S\u1eed d\u1ee5ng trong c\u00e1c nh\u00e0 m\u00e1y \u0111i\u1ec7n \u0111\u1ec3 l\u00e0m m\u00e1t d\u1ea7u bi\u1ebfn \u00e1p ho\u1eb7c trao \u0111\u1ed5i nhi\u1ec7t gi\u1eefa c\u00e1c l\u01b0u ch\u1ea5t kh\u00e1c nhau.<\/li>\n<li><b>C\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t:<\/b> \u00c1p d\u1ee5ng trong c\u00e1c quy tr\u00ecnh h\u00f3a h\u1ecdc \u0111\u1ec3 duy tr\u00ec v\u00e0 ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 ph\u1ea3n \u1ee9ng.<\/li>\n<li><b>H\u1ec7 th\u1ed1ng HVAC:<\/b> S\u1eed d\u1ee5ng trong h\u1ec7 th\u1ed1ng \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed v\u00e0 th\u00f4ng gi\u00f3 \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i nhi\u1ec7t.<\/li>\n<\/ul>\n<p>Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 c\u00e1c nguy\u00ean l\u00fd nhi\u1ec7t \u0111\u1ed9ng l\u1ef1c h\u1ecdc, d\u00f2ng ch\u1ea3y ch\u1ea5t l\u1ecfng v\u00e0 trao \u0111\u1ed5i nhi\u1ec7t. B\u1eb1ng c\u00e1ch n\u1eafm v\u1eefng c\u00e1c th\u00f4ng s\u1ed1 v\u00e0 c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c thi\u1ebft b\u1ecb hi\u1ec7u qu\u1ea3, an to\u00e0n h\u01a1n v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o: H\u01b0\u1edbng d\u1eabn c\u01a1 b\u1ea3n v\u1ec1 c\u1ea5u tr\u00fac, nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t d\u00f2ng ch\u00e9o trong c\u00f4ng nghi\u1ec7p.<\/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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