{"id":688961,"date":"2024-08-07T01:46:17","date_gmt":"2024-08-07T00:46:17","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=688961"},"modified":"2024-08-07T01:46:17","modified_gmt":"2024-08-07T00:46:17","slug":"truyen-nhiet-doi-luu-hieu-qua-he-thong","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/truyen-nhiet-doi-luu-hieu-qua-he-thong\/","title":{"rendered":"Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u | Hi\u1ec7u Qu\u1ea3 & H\u1ec7 Th\u1ed1ng"},"content":{"rendered":"

Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u | Hi\u1ec7u Qu\u1ea3 & H\u1ec7 Th\u1ed1ng gi\u00fap t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i nhi\u1ec7t, t\u0103ng hi\u1ec7u su\u1ea5t trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 d\u00e2n d\u1ee5ng.<\/p>\n

\"Truy\u1ec1n<\/p>\n

Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u | Hi\u1ec7u Qu\u1ea3 & H\u1ec7 Th\u1ed1ng<\/h2>\n

Truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u l\u00e0 m\u1ed9t trong ba ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n nhi\u1ec7t ch\u00ednh, c\u00f9ng v\u1edbi d\u1eabn nhi\u1ec7t v\u00e0 b\u1ee9c x\u1ea1 nhi\u1ec7t. Truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u x\u1ea3y ra khi nhi\u1ec7t n\u0103ng \u0111\u01b0\u1ee3c chuy\u1ec3n t\u1eeb m\u1ed9t n\u01a1i \u0111\u1ebfn n\u01a1i kh\u00e1c th\u00f4ng qua chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 hi\u1ec7u qu\u1ea3 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y.<\/p>\n

Hi\u1ec7u Qu\u1ea3 Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u<\/h2>\n

Hi\u1ec7u qu\u1ea3 c\u1ee7a truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1 nh\u01b0 t\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y, \u0111\u1ed9 nh\u1edbt c\u1ee7a ch\u1ea5t l\u01b0u, v\u00e0 nhi\u1ec7t \u0111\u1ed9 ch\u00eanh l\u1ec7ch. \u0110\u1ec3 \u0111\u1ecbnh l\u01b0\u1ee3ng hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u, ch\u00fang ta s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 th\u00f4ng s\u1ed1 quan tr\u1ecdng nh\u01b0 s\u1ed1 Reynolds (Re), s\u1ed1 Prandtl (Pr), v\u00e0 s\u1ed1 Nusselt (Nu).<\/p>\n

<\/p>\n

  • S\u1ed1 Reynolds (Re):<\/b> S\u1ed1 Reynolds l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00f4ng th\u1ee9 nguy\u00ean d\u00f9ng \u0111\u1ec3 m\u00f4 t\u1ea3 d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed. C\u00f4ng th\u1ee9c t\u00ednh s\u1ed1 Reynolds l\u00e0:<\/li>\n

    <\/u1>
    \n\\[
    \n\\text{Re} = \\frac{\\rho v L}{\\mu}
    \n\\]\n

    trong \u0111\u00f3:<\/p>\n

    <\/p>\n

  • \u03c1<\/i> l\u00e0 m\u1eadt \u0111\u1ed9 c\u1ee7a ch\u1ea5t l\u1ecfng (kg\/m3<\/sup>).<\/li>\n
  • v<\/i> l\u00e0 t\u1ed1c \u0111\u1ed9 c\u1ee7a d\u00f2ng ch\u1ea3y (m\/s).<\/li>\n
  • L<\/i> l\u00e0 chi\u1ec1u d\u00e0i \u0111\u1eb7c tr\u01b0ng (m).<\/li>\n
  • \u03bc<\/i> l\u00e0 \u0111\u1ed9 nh\u1edbt \u0111\u1ed9ng h\u1ecdc (Pa\u00b7s).<\/li>\n

    <\/o1><\/p>\n

    <\/p>\n

  • S\u1ed1 Prandtl (Pr):<\/b> S\u1ed1 Prandtl l\u00e0 t\u1ef7 s\u1ed1 gi\u1eefa \u0111\u1ed9 nh\u1edbt \u0111\u1ed9ng h\u1ecdc v\u00e0 \u0111\u1ed9 nh\u1edbt nhi\u1ec7t. C\u00f4ng th\u1ee9c t\u00ednh s\u1ed1 Prandtl l\u00e0:<\/li>\n

    <\/u1>
    \n\\[
    \n\\text{Pr} = \\frac{c_p \\mu}{k}
    \n\\]\n

    trong \u0111\u00f3:<\/p>\n

    <\/p>\n

  • cp<\/sub><\/i> l\u00e0 nhi\u1ec7t dung ri\u00eang \u1edf \u00e1p su\u1ea5t kh\u00f4ng \u0111\u1ed5i (J\/kg\u00b7K).<\/li>\n
  • \u03bc<\/i> l\u00e0 \u0111\u1ed9 nh\u1edbt \u0111\u1ed9ng h\u1ecdc (Pa\u00b7s).<\/li>\n
  • k<\/i> l\u00e0 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t (W\/m\u00b7K).<\/li>\n

    <\/o1><\/p>\n

    <\/p>\n

  • S\u1ed1 Nusselt (Nu):<\/b> S\u1ed1 Nusselt l\u00e0 t\u1ef7 s\u1ed1 gi\u1eefa truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u v\u00e0 d\u1eabn nhi\u1ec7t. C\u00f4ng th\u1ee9c t\u00ednh s\u1ed1 Nusselt l\u00e0:<\/li>\n

    <\/u1>
    \n\\[
    \n\\text{Nu} = \\frac{h L}{k}
    \n\\]\n

    trong \u0111\u00f3:<\/p>\n

    <\/p>\n

  • h<\/i> l\u00e0 h\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u (W\/m2<\/sup>\u00b7K).<\/li>\n
  • L<\/i> l\u00e0 chi\u1ec1u d\u00e0i \u0111\u1eb7c tr\u01b0ng (m).<\/li>\n
  • k<\/i> l\u00e0 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t (W\/m\u00b7K).<\/li>\n

    <\/o1><\/p>\n

    C\u00e1c H\u1ec7 Th\u1ed1ng Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u<\/h2>\n

    Nhi\u1ec1u h\u1ec7 th\u1ed1ng k\u1ef9 thu\u1eadt v\u00e0 c\u00f4ng ngh\u1ec7 s\u1eed d\u1ee5ng truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng hi\u1ec7u qu\u1ea3 l\u00e0m m\u00e1t ho\u1eb7c s\u01b0\u1edfi \u1ea5m. M\u1ed9t s\u1ed1 v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m:<\/p>\n

    <\/p>\n

  • \u0110i\u1ec1u Ho\u00e0 Kh\u00f4ng Kh\u00ed:<\/b> H\u1ec7 th\u1ed1ng \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed s\u1eed d\u1ee5ng c\u00e1c qu\u1ea1t gi\u00f3 \u0111\u1ec3 t\u1ea1o ra d\u00f2ng ch\u1ea3y kh\u00f4ng kh\u00ed qua cu\u1ed9n d\u00e2y l\u1ea1nh, gi\u00fap l\u00e0m m\u00e1t kh\u00f4ng gian b\u00ean trong.<\/li>\n
  • L\u00e0m M\u00e1t \u0110\u1ed9ng C\u01a1:<\/b> \u0110\u1ed9ng c\u01a1 xe h\u01a1i v\u00e0 c\u00e1c lo\u1ea1i \u0111\u1ed9ng c\u01a1 kh\u00e1c s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t b\u1eb1ng ch\u1ea5t l\u1ecfng \u0111\u1ec3 gi\u1eef nhi\u1ec7t \u0111\u1ed9 trong gi\u1edbi h\u1ea1n an to\u00e0n.<\/li>\n
  • N\u1ed3i H\u01a1i:<\/b> N\u1ed3i h\u01a1i s\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng, th\u01b0\u1eddng l\u00e0 n\u01b0\u1edbc, \u0111\u1ec3 truy\u1ec1n nhi\u1ec7t t\u1eeb ngu\u1ed3n nhi\u1ec7t \u0111\u1ebfn c\u00e1c b\u00ecnh ch\u1ee9a ho\u1eb7c thi\u1ebft b\u1ecb trao \u0111\u1ed5i nhi\u1ec7t kh\u00e1c.<\/li>\n

    <\/u1><\/p>\n

    Truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u l\u00e0 m\u1ed9t ti\u00eau ch\u00ed quan tr\u1ecdng trong thi\u1ebft k\u1ebf v\u00e0 v\u1eadn h\u00e0nh c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y, gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u qu\u1ea3 s\u1eed d\u1ee5ng n\u0103ng l\u01b0\u1ee3ng v\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n

    K\u1ebft Lu\u1eadn<\/h2>\n

    Truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt v\u00e0 h\u00e0ng ng\u00e0y. Hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u0169ng nh\u01b0 c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a n\u00f3 s\u1ebd gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf v\u00e0 s\u1eed d\u1ee5ng c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u qu\u1ea3 h\u01a1n. T\u1eeb \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed \u0111\u1ebfn n\u1ed3i h\u01a1i, truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu c\u1ee7a k\u1ef9 thu\u1eadt nhi\u1ec7t ng\u00e0y nay.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u | Hi\u1ec7u Qu\u1ea3 & H\u1ec7 Th\u1ed1ng gi\u00fap t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i nhi\u1ec7t, t\u0103ng hi\u1ec7u su\u1ea5t trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 d\u00e2n d\u1ee5ng.<\/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":"\nTruy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u | Hi\u1ec7u Qu\u1ea3 & H\u1ec7 Th\u1ed1ng<\/title>\n<meta name=\"description\" content=\"Truy\u1ec1n Nhi\u1ec7t \u0110\u1ed1i L\u01b0u | Hi\u1ec7u Qu\u1ea3 & H\u1ec7 Th\u1ed1ng gi\u00fap t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i nhi\u1ec7t, t\u0103ng hi\u1ec7u su\u1ea5t trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 d\u00e2n d\u1ee5ng.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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