{"id":688141,"date":"2024-09-27T13:12:01","date_gmt":"2024-09-27T12:12:01","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=688141"},"modified":"2024-09-27T13:12:01","modified_gmt":"2024-09-27T12:12:01","slug":"chat-long-nhiet-truyen-nhiet-hieu-suat-ung-dung","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/chat-long-nhiet-truyen-nhiet-hieu-suat-ung-dung\/","title":{"rendered":"Ch\u1ea5t L\u1ecfng Nhi\u1ec7t | Truy\u1ec1n Nhi\u1ec7t, Hi\u1ec7u Su\u1ea5t &#038; \u1ee8ng D\u1ee5ng"},"content":{"rendered":"<p class=\"sidekick\">Ch\u1ea5t l\u1ecfng nhi\u1ec7t l\u00e0 g\u00ec, c\u00e1ch truy\u1ec1n nhi\u1ec7t v\u00e0 t\u0103ng hi\u1ec7u su\u1ea5t c\u0169ng nh\u01b0 \u1ee9ng d\u1ee5ng trong \u0111\u1eddi s\u1ed1ng v\u00e0 c\u00f4ng nghi\u1ec7p. T\u00ecm hi\u1ec3u chi ti\u1ebft v\u1ec1 ch\u00fang qua b\u00e0i vi\u1ebft n\u00e0y.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/chat_long_nhiet_truyen_nhiet_hieu_suat_ung_dung.png\" alt=\"Ch\u1ea5t L\u1ecfng Nhi\u1ec7t | Truy\u1ec1n Nhi\u1ec7t, Hi\u1ec7u Su\u1ea5t &#038; \u1ee8ng D\u1ee5ng\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Ch\u1ea5t L\u1ecfng Nhi\u1ec7t | Truy\u1ec1n Nhi\u1ec7t, Hi\u1ec7u Su\u1ea5t &#038; \u1ee8ng D\u1ee5ng<\/h2>\n<p>Ch\u1ea5t l\u1ecfng nhi\u1ec7t l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 quan tr\u1ecdng trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t. Ch\u1ea5t l\u1ecfng nhi\u1ec7t kh\u00f4ng ch\u1ec9 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c truy\u1ec1n nhi\u1ec7t m\u00e0 c\u00f2n c\u00f3 nh\u1eefng \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u c\u00e1ch truy\u1ec1n nhi\u1ec7t qua ch\u1ea5t l\u1ecfng nhi\u1ec7t, hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nhi\u1ec7t, v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn c\u1ee7a ch\u00fang.<\/p>\n<h2>Truy\u1ec1n Nhi\u1ec7t Qua Ch\u1ea5t L\u1ecfng Nhi\u1ec7t<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t qua ch\u1ea5t l\u1ecfng nhi\u1ec7t c\u00f3 th\u1ec3 x\u1ea3y ra theo ba c\u00e1ch ch\u00ednh:<\/p>\n<ul>\n<li>Truy\u1ec1n nhi\u1ec7t d\u1eabn (Conduction)<\/li>\n<li>Truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u (Convection)<\/li>\n<li>Truy\u1ec1n nhi\u1ec7t b\u1ee9c x\u1ea1 (Radiation)<\/li>\n<\/ul>\n<p>Khi ch\u1ea5t l\u1ecfng nhi\u1ec7t chuy\u1ec3n \u0111\u1ed9ng qua c\u00e1c b\u1ec1 m\u1eb7t n\u00f3ng ho\u1eb7c l\u1ea1nh, n\u00f3 c\u00f3 th\u1ec3 truy\u1ec1n nhi\u1ec7t th\u00f4ng qua qu\u00e1 tr\u00ecnh \u0111\u1ed1i l\u01b0u t\u1ef1 nhi\u00ean ho\u1eb7c \u0111\u1ed1i l\u01b0u c\u01b0\u1ee1ng b\u1ee9c. C\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n qua ch\u1ea5t l\u1ecfng nhi\u1ec7t trong ch\u1ebf \u0111\u1ed9 \u0111\u1ed1i l\u01b0u \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 b\u1edfi \u0111\u1ecbnh lu\u1eadt c\u1ee7a Newton v\u1ec1 l\u00e0m m\u00e1t:<\/p>\n<p><i>Q = hA(T_s &#8211; T_\u221e)<\/i><\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><i>Q<\/i>: Nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n qua (W)<\/li>\n<li><i>h<\/i>: H\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u (W\/m<sup>2<\/sup>K)<\/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><i>T_s<\/i>: Nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t (K)<\/li>\n<li><i>T_\u221e<\/i>: Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a ch\u1ea5t l\u1ecfng xa b\u1ec1 m\u1eb7t (K)<\/li>\n<\/ul>\n<h2>Hi\u1ec7u Su\u1ea5t c\u1ee7a H\u1ec7 Th\u1ed1ng S\u1eed D\u1ee5ng Ch\u1ea5t L\u1ecfng Nhi\u1ec7t<\/h2>\n<p>Hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nhi\u1ec7t, nh\u01b0 c\u00e1c b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1eb1ng h\u1ec7 s\u1ed1 hi\u1ec7u su\u1ea5t nhi\u1ec7t (e). H\u1ec7 s\u1ed1 n\u00e0y th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng c\u1ee7a h\u1ec7 th\u1ed1ng trong vi\u1ec7c trao \u0111\u1ed5i nhi\u1ec7t gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng:<\/p>\n<p><i>e = \\frac{Q th\u1ef1c t\u1ebf}{Q l\u00fd thuy\u1ebft}<\/i><\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><i>e<\/i>: Hi\u1ec7u su\u1ea5t trao \u0111\u1ed5i nhi\u1ec7t<\/li>\n<li><i>Q th\u1ef1c t\u1ebf<\/i>: Nhi\u1ec7t l\u01b0\u1ee3ng th\u1ef1c t\u1ebf truy\u1ec1n qua (W)<\/li>\n<li><i>Q l\u00fd thuy\u1ebft<\/i>: Nhi\u1ec7t l\u01b0\u1ee3ng l\u00fd thuy\u1ebft t\u1ed1i \u0111a c\u00f3 th\u1ec3 truy\u1ec1n qua (W)<\/li>\n<\/ul>\n<p>Hi\u1ec7u su\u1ea5t cao \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c h\u1ec7 th\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng trao \u0111\u1ed5i nhi\u1ec7t t\u1ed1t h\u01a1n v\u00e0 l\u00e0m vi\u1ec7c hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<h2>\u1ee8ng D\u1ee5ng c\u1ee7a Ch\u1ea5t L\u1ecfng Nhi\u1ec7t<\/h2>\n<p>Ch\u1ea5t l\u1ecfng nhi\u1ec7t c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ol>\n<li>H\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t v\u00e0 s\u01b0\u1edfi \u1ea5m: C\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed v\u00e0 h\u1ec7 th\u1ed1ng s\u01b0\u1edfi \u1ea5m s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nhi\u1ec7t \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 trong kh\u00f4ng gian s\u1ed1ng v\u00e0 l\u00e0m vi\u1ec7c.<\/li>\n<li>Ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng t\u00e1i t\u1ea1o: C\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t m\u1eb7t tr\u1eddi s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nhi\u1ec7t \u0111\u1ec3 thu v\u00e0 l\u01b0u tr\u1eef n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi.<\/li>\n<li>C\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t: Trong c\u00e1c quy tr\u00ecnh h\u00f3a h\u1ecdc, ch\u1ea5t l\u1ecfng nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 c\u1ee7a c\u00e1c ph\u1ea3n \u1ee9ng.<\/li>\n<li>Ng\u00e0nh \u00f4 t\u00f4: C\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t v\u00e0 b\u00f4i tr\u01a1n trong \u0111\u1ed9ng c\u01a1 \u00f4 t\u00f4 s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nhi\u1ec7t \u0111\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 v\u1eadn h\u00e0nh t\u1ed1i \u01b0u.<\/li>\n<\/ol>\n<p>Qua b\u00e0i vi\u1ebft n\u00e0y, hy v\u1ecdng b\u1ea1n \u0111\u00e3 c\u00f3 c\u00e1i nh\u00ecn r\u00f5 r\u00e0ng h\u01a1n v\u1ec1 vai tr\u00f2 c\u1ee7a ch\u1ea5t l\u1ecfng nhi\u1ec7t trong vi\u1ec7c truy\u1ec1n nhi\u1ec7t, hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng nhi\u1ec7t v\u00e0 nh\u1eefng \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a ch\u00fang. Ch\u1ea5t l\u1ecfng nhi\u1ec7t th\u1eadt s\u1ef1 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 kh\u00f4ng th\u1ec3 thi\u1ebfu trong nhi\u1ec1u l\u0129nh v\u1ef1c c\u1ee7a cu\u1ed9c s\u1ed1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ch\u1ea5t l\u1ecfng nhi\u1ec7t l\u00e0 g\u00ec, c\u00e1ch truy\u1ec1n nhi\u1ec7t v\u00e0 t\u0103ng hi\u1ec7u su\u1ea5t c\u0169ng nh\u01b0 \u1ee9ng d\u1ee5ng trong \u0111\u1eddi s\u1ed1ng v\u00e0 c\u00f4ng nghi\u1ec7p. T\u00ecm hi\u1ec3u chi ti\u1ebft v\u1ec1 ch\u00fang qua b\u00e0i vi\u1ebft n\u00e0y.<\/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>Ch\u1ea5t L\u1ecfng Nhi\u1ec7t | Truy\u1ec1n Nhi\u1ec7t, Hi\u1ec7u Su\u1ea5t &amp; \u1ee8ng D\u1ee5ng<\/title>\n<meta name=\"description\" content=\"Ch\u1ea5t l\u1ecfng nhi\u1ec7t l\u00e0 g\u00ec, c\u00e1ch truy\u1ec1n nhi\u1ec7t v\u00e0 t\u0103ng hi\u1ec7u su\u1ea5t c\u0169ng nh\u01b0 \u1ee9ng d\u1ee5ng trong \u0111\u1eddi s\u1ed1ng v\u00e0 c\u00f4ng nghi\u1ec7p. 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