{"id":689939,"date":"2024-11-16T03:24:05","date_gmt":"2024-11-16T02:24:05","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=689939"},"modified":"2024-11-16T03:24:05","modified_gmt":"2024-11-16T02:24:05","slug":"thiet-ke-bo-trao-doi-nhiet-cho-moi-truong-nhiet-do-thap","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/thiet-ke-bo-trao-doi-nhiet-cho-moi-truong-nhiet-do-thap\/","title":{"rendered":"Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p"},"content":{"rendered":"<p class=\"sidekick\">Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p: nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, l\u1ee3i \u00edch v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf trong c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh v\u00e0 \u0111\u00f4ng l\u1ea1nh.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/thiet_ke_bo_trao_doi_nhiet_cho_moi_truong_nhiet_do_thap.png\" alt=\"Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p<\/h2>\n<p>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t l\u00e0 thi\u1ebft b\u1ecb quan tr\u1ecdng trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i nhi\u1ec7t gi\u1eefa hai ho\u1eb7c nhi\u1ec1u ch\u1ea5t l\u1ecfng. Khi l\u00e0m vi\u1ec7c trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p, thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t c\u1ea7n \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u su\u1ea5t cao. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c y\u1ebfu t\u1ed1 quan tr\u1ecdng c\u1ea7n xem x\u00e9t khi thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/p>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 c\u1ea7n xem x\u00e9t<\/h3>\n<ul>\n<li>V\u1eadt li\u1ec7u:<\/li>\n<ul>\n<li>Ch\u1ecdn v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1ed1t.<\/li>\n<li>Tr\u00e1nh v\u1eadt li\u1ec7u d\u1ec5 b\u1ecb g\u00e3y ho\u1eb7c bi\u1ebfn d\u1ea1ng \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/li>\n<\/ul>\n<li>K\u00edch th\u01b0\u1edbc v\u00e0 H\u00ecnh d\u00e1ng:<\/li>\n<ul>\n<li>K\u00edch th\u01b0\u1edbc v\u00e0 h\u00ecnh d\u00e1ng c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac c\u0169ng nh\u01b0 hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t.<\/li>\n<li>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t ki\u1ec3u \u1ed1ng c\u00f3 th\u1ec3 l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u do c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn.<\/li>\n<\/ul>\n<li>Ph\u00e2n ph\u1ed1i ch\u1ea5t l\u1ecfng:<\/li>\n<ul>\n<li>\u0110\u1ea3m b\u1ea3o d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i \u0111\u1ed3ng \u0111\u1ec1u.<\/li>\n<li>Thi\u1ebft k\u1ebf c\u00e1c k\u00eanh v\u00e0 \u0111\u01b0\u1eddng \u1ed1ng \u0111\u1ec3 tr\u00e1nh hi\u1ec7n t\u01b0\u1ee3ng ngh\u1ebdn ho\u1eb7c v\u00f9ng ch\u1ebft.<\/li>\n<\/ul>\n<li>C\u00e1ch nhi\u1ec7t:<\/li>\n<ul>\n<li>S\u1eed d\u1ee5ng c\u00e1ch nhi\u1ec7t \u0111\u1ec3 gi\u1ea3m thi\u1ec3u t\u1ed5n th\u1ea5t nhi\u1ec7t \u0111\u1ed9 trong qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t.<\/li>\n<li>Ch\u1ecdn v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t ph\u00f9 h\u1ee3p v\u1edbi m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/li>\n<\/ul>\n<\/ul>\n<h3>Ph\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n nhi\u1ec7t<\/h3>\n<p>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n nhi\u1ec7t c\u01a1 b\u1ea3n. M\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng tr\u00ecnh c\u01a1 b\u1ea3n nh\u1ea5t l\u00e0:<\/p>\n<p>\n  <i>Q<\/i> = <i>U<\/i> * <i>A<\/i> * \u0394<i>T<\/i>\n<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><i>Q<\/i>: Nhi\u1ec7t l\u01b0\u1ee3ng trao \u0111\u1ed5i (W)<\/li>\n<li><i>U<\/i>: H\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t t\u1ed5ng qu\u00e1t (W\/m<sup>2<\/sup>\u00b7K)<\/li>\n<li><i>A<\/i>: Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t (m<sup>2<\/sup>)<\/li>\n<li>\u0394<i>T<\/i>: Hi\u1ec7u s\u1ed1 nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh (K)<\/li>\n<\/ul>\n<p>Hi\u1ec7u s\u1ed1 nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng c\u00f4ng th\u1ee9c logarit:<\/p>\n<p>\n  \u0394<i>T<\/i><sub>LM<\/sub> = \\(\\frac{\u0394T_1 &#8211; \u0394T_2}{\\ln\\left(\\frac{\u0394T_1}{\u0394T_2}\\right)}\\)\n<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\u0394<i>T<\/i><sub>LM<\/sub>: Hi\u1ec7u s\u1ed1 nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh logarit<\/li>\n<li>\u0394<i>T<\/i><sub>1<\/sub>: Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 t\u1ea1i \u0111\u1ea7u v\u00e0o<\/li>\n<li>\u0394<i>T<\/i><sub>2<\/sub>: Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 t\u1ea1i \u0111\u1ea7u ra<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 \u1ee9ng d\u1ee5ng<\/h3>\n<p>M\u1ed9t v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh v\u1ec1 \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p l\u00e0 trong ng\u00e0nh c\u00f4ng nghi\u1ec7p \u0111\u00f4ng l\u1ea1nh. \u1ede \u0111\u00e2y, b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m l\u1ea1nh ch\u1ea5t l\u1ecfng nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>\n<h3>K\u1ebft lu\u1eadn<\/h3>\n<p>Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p \u0111\u00f2i h\u1ecfi nhi\u1ec1u y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1eb7c bi\u1ec7t v\u1ec1 v\u1eadt li\u1ec7u, k\u1ebft c\u1ea5u, ph\u00e2n ph\u1ed1i ch\u1ea5t l\u1ecfng v\u00e0 c\u00e1ch nhi\u1ec7t. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 v\u00e0 \u00e1p d\u1ee5ng nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t hi\u1ec7u qu\u1ea3, gi\u1ea3m thi\u1ec3u t\u1ed5n th\u1ea5t nhi\u1ec7t v\u00e0 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t cao trong c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p: nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, l\u1ee3i \u00edch v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf trong c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh v\u00e0 \u0111\u00f4ng l\u1ea1nh.<\/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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