{"id":22702,"date":"2025-09-30T09:45:27","date_gmt":"2025-09-30T01:45:27","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=22702"},"modified":"2025-09-30T09:45:27","modified_gmt":"2025-09-30T01:45:27","slug":"jaka-je-tepelna-vodivost-vaseho-chladice-ve-w-m-k","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/what-is-the-thermal-conductivity-of-your-heat-sink-in-w-m%c2%b7k\/","title":{"rendered":"Jak\u00e1 je tepeln\u00e1 vodivost va\u0161eho chladi\u010de ve W\/m-K?"},"content":{"rendered":"

\"obr\u00e1zek<\/p>\n

Jste zmateni v\u0161emi tepeln\u00fdmi \u010d\u00edsly ve specifikac\u00edch chladi\u010de? Nejste jedin\u00ed. Mnoho kupuj\u00edc\u00edch nech\u00e1pe, co znamen\u00e1 W\/m-K a pro\u010d je to d\u016fle\u017eit\u00e9 pro skute\u010dn\u00e9 pou\u017eit\u00ed.<\/p>\n

Tepeln\u00e1 vodivost hlin\u00edkov\u00fdch chladi\u010d\u016f se obvykle pohybuje od 150 do 235 W\/m-K v z\u00e1vislosti na slitin\u011b a zpracov\u00e1n\u00ed.<\/strong><\/p>\n

Toto \u010d\u00edslo v\u0161ak samo o sob\u011b nevypov\u00edd\u00e1 o cel\u00e9 situaci. Poj\u010fme si ho rozebrat a pochopit, co skute\u010dn\u011b ovliv\u0148uje tepeln\u00fd v\u00fdkon.<\/p>\n

Jak se testuje tepeln\u00fd v\u00fdkon chladi\u010de?<\/h2>\n

N\u011bkdy si lid\u00e9 mysl\u00ed, \u017ee tepeln\u00fd v\u00fdkon je jen \u010d\u00edslo z datasheetu. Ve skute\u010dnosti se v\u0161ak pe\u010dliv\u011b m\u011b\u0159\u00ed v kontrolovan\u00fdch testovac\u00edch podm\u00ednk\u00e1ch.<\/p>\n

Tepeln\u00fd v\u00fdkon se testuje tak, \u017ee se na z\u00e1kladnu p\u0159iv\u00e1d\u00ed teplo a m\u011b\u0159\u00ed se, jak rychle se v ur\u010dit\u00e9m prost\u0159ed\u00ed rozptyluje p\u0159es \u017eebra.<\/strong><\/p>\n

\"obr\u00e1zek<\/p>\n

V\u00fdrobci pou\u017e\u00edvaj\u00ed standardizovan\u00e9 testy pro stanoven\u00ed tepeln\u00e9ho odporu a rozptylu tepla. Typick\u00fd postup vypad\u00e1 n\u00e1sledovn\u011b:<\/p>\n

Standardn\u00ed nastaven\u00ed testu<\/h3>\n\n\n\n\n\n\n\n\n\n
Komponenta<\/th>\nPopis<\/th>\n<\/tr>\n<\/thead>\n
Zdroj tepla<\/td>\nSimulovan\u00e9 za\u0159\u00edzen\u00ed (nap\u0159. v\u00fdkonov\u00fd odpor nebo topn\u00e9 t\u011bleso)<\/td>\n<\/tr>\n
Sn\u00edma\u010d z\u00e1kladn\u00ed desky<\/td>\nM\u011b\u0159en\u00ed z\u00e1kladn\u00ed teploty<\/td>\n<\/tr>\n
Sn\u00edma\u010d okoln\u00edho prost\u0159ed\u00ed<\/td>\nM\u011b\u0159\u00ed teplotu okoln\u00edho vzduchu<\/td>\n<\/tr>\n
\u0158\u00edzen\u00ed proud\u011bn\u00ed vzduchu<\/td>\nZaji\u0161\u0165uje st\u00e1lou rychlost letu (nap\u0159. 1 m\/s).<\/td>\n<\/tr>\n
Datov\u00fd z\u00e1znamn\u00edk<\/td>\nSleduje tepeln\u00e9 \u00fadaje v pr\u016fb\u011bhu \u010dasu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

V\u00fdsledky test\u016f obvykle zahrnuj\u00ed<\/h3>\n
    \n
  • Tepeln\u00fd odpor (\u00b0C\/W)<\/strong> - ni\u017e\u0161\u00ed je lep\u0161\u00ed<\/li>\n
  • Rozptyl tepla (W)<\/strong> - jak velk\u00fd v\u00fdkon zvl\u00e1dne<\/li>\n
  • Teplota delta (\u0394T)<\/strong> - rozd\u00edl mezi z\u00e1kladnou a okol\u00edm<\/li>\n<\/ul>\n

    Kdy\u017e jsem poprv\u00e9 za\u010dal sh\u00e1n\u011bt chladi\u010de, \u0161patn\u011b jsem pochopil specifikaci, kter\u00e1 \u0159\u00edkala \"tepeln\u00fd odpor = 2,5 \u00b0C\/W\". Myslel jsem, \u017ee je to \u0161patn\u011b. Ale u pasivn\u00edho hlin\u00edkov\u00e9ho chladi\u010de bez ventil\u00e1toru to bylo ve sv\u00e9 kategorii vlastn\u011b dobr\u00e9.<\/p>\n

    <\/svg> Tepeln\u00fd v\u00fdkon chladi\u010de se testuje p\u0159iv\u00e1d\u011bn\u00edm tepla a m\u011b\u0159en\u00edm teplotn\u00edch rozd\u00edl\u016f nap\u0159\u00ed\u010d jednotkou.<\/b>Pravda<\/span><\/p>

    To pom\u00e1h\u00e1 kvantifikovat, jak \u00fa\u010dinn\u011b dok\u00e1\u017ee chladi\u010d odv\u00e1d\u011bt teplo.<\/p><\/div>\n

    <\/svg> Tepeln\u00fd v\u00fdkon lze posoudit pouh\u00fdm pohledem na velikost chladi\u010de.<\/b>False<\/span><\/p>

    Pro stanoven\u00ed skute\u010dn\u00e9 tepeln\u00e9 \u00fa\u010dinnosti je nutn\u00e9 prov\u00e9st zkou\u0161ky v kontrolovan\u00fdch podm\u00ednk\u00e1ch.<\/p><\/div>\n

    Jak\u00e9 faktory ovliv\u0148uj\u00ed tepelnou vodivost chladi\u010d\u016f?<\/h2>\n

    Je snadn\u00e9 si myslet, \u017ee v\u0161echny hlin\u00edkov\u00e9 chladi\u010de maj\u00ed stejn\u00fd v\u00fdkon. Ale nen\u00ed to pravda. Na to, jak dob\u0159e teplo proch\u00e1z\u00ed materi\u00e1lem, m\u00e1 vliv n\u011bkolik fyzik\u00e1ln\u00edch a konstruk\u010dn\u00edch faktor\u016f.<\/p>\n

    Typ slitiny, mikrostruktura, povrchov\u00e1 \u00faprava a p\u0159\u00edpadn\u00e9 ne\u010distoty nebo \u00fapravy mohou ovlivnit tepelnou vodivost chladi\u010de.<\/strong><\/p>\n

    \"obr\u00e1zek<\/p>\n

    Rozd\u011blme si to do jasn\u00fdch kategori\u00ed:<\/p>\n

    Vlastnosti materi\u00e1lu, kter\u00e9 ovliv\u0148uj\u00ed vodivost<\/h3>\n\n\n\n\n\n\n\n\n
    Faktor<\/th>\nVliv<\/th>\nPozn\u00e1mky<\/th>\n<\/tr>\n<\/thead>\n
    Typ slitiny<\/td>\nHlavn\u00ed<\/td>\n\u010cist\u00fd hlin\u00edk (99%) > 6063 > 6061<\/td>\n<\/tr>\n
    Struktura zrna<\/td>\nM\u00edrn\u00e1<\/td>\nJemn\u011bj\u0161\u00ed zrna zlep\u0161uj\u00ed pr\u016ftok<\/td>\n<\/tr>\n
    Ne\u010distoty<\/td>\nHlavn\u00ed<\/td>\nOxidy a zbytky sni\u017euj\u00ed vodivost<\/td>\n<\/tr>\n
    Teplota<\/td>\nDrobn\u00e9<\/td>\nVodivost p\u0159i vy\u0161\u0161\u00edch teplot\u00e1ch m\u00edrn\u011b kles\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Faktory n\u00e1vrhu a zpracov\u00e1n\u00ed<\/h3>\n\n\n\n\n\n\n\n
    Faktor<\/th>\nEfekt<\/th>\n<\/tr>\n<\/thead>\n
    Kvalita vytla\u010dov\u00e1n\u00ed<\/td>\n\u0160patn\u00e9 vytla\u010dov\u00e1n\u00ed vede ke vzniku mikrodutin<\/td>\n<\/tr>\n
    Oxidace povrchu<\/td>\nM\u00edrn\u011b sni\u017euje kontaktn\u00ed p\u0159enos tepla<\/td>\n<\/tr>\n
    Kvalita obr\u00e1b\u011bn\u00ed<\/td>\nHrub\u00e9 hrany nebo tepeln\u00e9 mezery mohou vytv\u00e1\u0159et odpor.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Kdysi jsem porovn\u00e1val dva chladi\u010de vyroben\u00e9 z r\u016fzn\u00fdch hlin\u00edkov\u00fdch slitin. Jeden m\u011bl vodivost 230 W\/m-K, druh\u00fd pouze 170. Ten ni\u017e\u0161\u00ed m\u011bl v\u011bt\u0161\u00ed obsah recykl\u00e1tu a ne\u010distot, co\u017e v\u00fdrazn\u011b ovlivnilo jeho chladic\u00ed v\u00fdkon p\u0159i z\u00e1t\u011b\u017ei.<\/p>\n

    <\/svg> Tepelnou vodivost hlin\u00edkov\u00fdch chladi\u010d\u016f ovliv\u0148uj\u00ed ne\u010distoty i typ slitiny.<\/b>Pravda<\/span><\/p>

    M\u011bn\u00ed vnit\u0159n\u00ed strukturu, co\u017e ovliv\u0148uje pohyb tepla kovem.<\/p><\/div>\n

    <\/svg> V\u0161echny hlin\u00edkov\u00e9 chladi\u010de maj\u00ed stejnou tepelnou vodivost bez ohledu na slitinu nebo v\u00fdrobu.<\/b>False<\/span><\/p>

    R\u016fzn\u00e9 slitiny a procesy maj\u00ed za n\u00e1sledek r\u016fzn\u00e9 tepeln\u00e9 vlastnosti.<\/p><\/div>\n

    Je vy\u0161\u0161\u00ed W\/m-K v\u017edy lep\u0161\u00ed pro hlin\u00edkov\u00e9 chladi\u010de?<\/h2>\n

    Kupuj\u00edc\u00ed se \u010dasto hon\u00ed za co nejvy\u0161\u0161\u00edm \u010d\u00edslem W\/m-K v domn\u011bn\u00ed, \u017ee zaru\u010duje lep\u0161\u00ed v\u00fdkon. V re\u00e1ln\u00fdch aplikac\u00edch to v\u0161ak nen\u00ed tak jednoduch\u00e9.<\/p>\n

    Vy\u0161\u0161\u00ed W\/m-K znamen\u00e1 rychlej\u0161\u00ed p\u0159enos tepla, ale nezaru\u010duje lep\u0161\u00ed chlazen\u00ed bez spr\u00e1vn\u00e9 konstrukce, proud\u011bn\u00ed vzduchu a kvality kontakt\u016f.<\/strong><\/p>\n

    \"Popis<\/p>\n

    Porovnejme dva hypotetick\u00e9 chladi\u010de:<\/p>\n

    Srovn\u00e1vac\u00ed tabulka<\/h3>\n\n\n\n\n\n\n
    Model<\/th>\nTepeln\u00e1 vodivost (W\/m-K)<\/th>\nTepeln\u00fd odpor (\u00b0C\/W)<\/th>\nNastaven\u00ed proud\u011bn\u00ed vzduchu<\/th>\n<\/tr>\n<\/thead>\n
    A<\/td>\n230<\/td>\n2.0<\/td>\nNucen\u00e9 proud\u011bn\u00ed vzduchu<\/td>\n<\/tr>\n
    B<\/td>\n170<\/td>\n1.5<\/td>\nOptimalizovan\u00e1 rozte\u010d \u017eeber<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    V re\u00e1ln\u00fdch testech si model B vedl l\u00e9pe - i p\u0159i ni\u017e\u0161\u00ed vodivosti - proto\u017ee jeho konstrukce pom\u00e1hala p\u0159i proud\u011bn\u00ed vzduchu a kontaktu s povrchem.<\/p>\n

    Dal\u0161\u00ed kl\u00ed\u010dov\u00e9 faktory krom\u011b W\/m-K<\/h3>\n
      \n
    • Kvalita kontaktu mezi z\u00e1kladnou a \u017eebrem<\/strong><\/li>\n
    • Plocha povrchu (hustota \u017eeber)<\/strong><\/li>\n
    • Sm\u011br a objem proud\u011bn\u00ed vzduchu<\/strong><\/li>\n
    • Mont\u00e1\u017en\u00ed tlak a tepeln\u00e1 pasta<\/strong><\/li>\n<\/ul>\n

      Jeden n\u00e1\u0161 z\u00e1kazn\u00edk p\u0159e\u0161el na vodiv\u011bj\u0161\u00ed chladi\u010d, ale dos\u00e1hl hor\u0161\u00edch v\u00fdsledk\u016f. Uk\u00e1zalo se, \u017ee jejich nov\u00fd d\u00edl m\u011bl m\u00e9n\u011b \u017eeber a nesouhlasil s jejich vzduchov\u00fdmi kan\u00e1ly. Vy\u0161\u0161\u00ed W\/m-K nepomohlo.<\/p>\n

      <\/svg> Vy\u0161\u0161\u00ed hodnota W\/m-K m\u016f\u017ee zlep\u0161it p\u0159enos tepla, ale nezaru\u010duje lep\u0161\u00ed celkov\u00fd chladic\u00ed v\u00fdkon.<\/b>Pravda<\/span><\/p>

      Velkou roli v \u00fa\u010dinnosti hraj\u00ed faktory designu a prost\u0159ed\u00ed.<\/p><\/div>\n

      <\/svg> Chladi\u010d s nejvy\u0161\u0161\u00edm W\/m-K v\u017edy chlad\u00ed nejl\u00e9pe.<\/b>False<\/span><\/p>

      Bez dobr\u00e9 konstrukce nebo proud\u011bn\u00ed vzduchu nemus\u00ed vysok\u00e1 vodivost pomoci.<\/p><\/div>\n

      Ovliv\u0148uje \u00faprava povrchu hodnoty tepeln\u00e9 vodivosti?<\/h2>\n

      Mo\u017en\u00e1 se v\u00e1m l\u00edb\u00ed vzhled eloxovan\u00fdch nebo pota\u017een\u00fdch chladi\u010d\u016f. Ale maj\u00ed tyto povrchov\u00e9 \u00fapravy vliv na v\u00fdkon? Odpov\u011b\u010f zn\u00ed ano i ne.<\/p>\n

      Povrchov\u00e9 \u00fapravy, jako je eloxov\u00e1n\u00ed, mohou m\u00edrn\u011b sn\u00ed\u017eit tepelnou vodivost na povrchu, ale mohou zlep\u0161it p\u0159enos tepla z\u00e1\u0159en\u00edm.<\/strong><\/p>\n

      \"obr\u00e1zek<\/p>\n

      Jak povrchov\u00e9 \u00fapravy ovliv\u0148uj\u00ed tepeln\u00fd tok<\/h3>\n\n\n\n\n\n\n\n
      L\u00e9\u010dba<\/th>\nVliv na vodivost<\/th>\nDal\u0161\u00ed dopady<\/th>\n<\/tr>\n<\/thead>\n
      Eloxov\u00e1n\u00ed<\/td>\nM\u00edrn\u011b sni\u017euje povrchovou vodivost<\/td>\nZlep\u0161uje odolnost proti korozi, emisivitu<\/td>\n<\/tr>\n
      Pr\u00e1\u0161kov\u00e9 lakov\u00e1n\u00ed<\/td>\nIzoluje povrch<\/td>\nPou\u017e\u00edv\u00e1 se pro kosmetick\u00e9 nebo ochrann\u00e9 \u00fa\u010dely<\/td>\n<\/tr>\n
      \u010cir\u00e1 vrstva oxidu<\/td>\nMinim\u00e1ln\u00ed dopad<\/td>\nP\u0159irozen\u011b se tvo\u0159\u00ed na hlin\u00edku<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Pro\u010d jsou n\u011bkter\u00e9 o\u0161et\u0159en\u00e9 d\u0159ezy v\u00fdkonn\u011bj\u0161\u00ed<\/h3>\n

      Eloxovan\u00e1 \u010dern\u00e1 povrchov\u00e1 \u00faprava m\u016f\u017ee zlep\u0161it vyza\u0159ov\u00e1n\u00ed tepla, zejm\u00e9na v pasivn\u00edm prost\u0159ed\u00ed nebo v prost\u0159ed\u00ed s n\u00edzk\u00fdm proud\u011bn\u00edm vzduchu. To pom\u00e1h\u00e1 kompenzovat mal\u00fd pokles vodivosti.<\/p>\n

      M\u011bl jsem z\u00e1kazn\u00edky, kte\u0159\u00ed po\u017eadovali neanodizovan\u00e9 d\u0159ezy v domn\u011bn\u00ed, \u017ee budou efektivn\u011bj\u0161\u00ed. Ale p\u0159i mnoha venkovn\u00edch pou\u017eit\u00edch se nepovlakovan\u00fd hlin\u00edk rychleji znehodnocoval v d\u016fsledku koroze, co\u017e vedlo ke \u0161patn\u00e9mu dlouhodob\u00e9mu v\u00fdkonu.<\/p>\n

      <\/svg> Eloxov\u00e1n\u00ed m\u016f\u017ee m\u00edrn\u011b sn\u00ed\u017eit tepelnou vodivost, ale v n\u011bkter\u00fdch aplikac\u00edch m\u016f\u017ee zv\u00fd\u0161it radia\u010dn\u00ed chlazen\u00ed.<\/b>Pravda<\/span><\/p>

      Povrchov\u00e9 \u00fapravy vym\u011b\u0148uj\u00ed vodivost za odolnost proti korozi a lep\u0161\u00ed emisivitu.<\/p><\/div>\n

      <\/svg> V\u0161echny povrchov\u00e9 \u00fapravy zlep\u0161uj\u00ed tepelnou vodivost chladi\u010d\u016f.<\/b>False<\/span><\/p>

      N\u011bkter\u00e9 povlaky mohou sni\u017eovat tepeln\u00fd tok, zejm\u00e9na siln\u011bj\u0161\u00ed izola\u010dn\u00ed vrstvy.<\/p><\/div>\n

      Z\u00e1v\u011br<\/h2>\n

      Tepeln\u00e1 vodivost je u\u017eite\u010dn\u00e9 \u010d\u00edslo - ale ne jedin\u00e9, na kter\u00e9m z\u00e1le\u017e\u00ed. Dob\u0159e navr\u017een\u00fd a spr\u00e1vn\u011b nainstalovan\u00fd chladi\u010d s pr\u016fm\u011brnou tepelnou vodivost\u00ed m\u016f\u017ee p\u0159ekonat \u0161patn\u011b integrovan\u00fd chladi\u010d s vysokou tepelnou vodivost\u00ed. Pod\u00edvejte se na cel\u00fd syst\u00e9m, nejen na specifikace.<\/p>","protected":false},"excerpt":{"rendered":"

      Confused by all the thermal numbers on heat sink specs? You\u2019re not the only one. Many buyers don\u2019t understand what W\/m\u00b7K means or why it matters in real-world use. The thermal conductivity of aluminum heat sinks typically ranges from 150 to 235 W\/m\u00b7K, depending on alloy and treatment. But that number alone doesn\u2019t tell the […]<\/p>\n","protected":false},"author":6,"featured_media":22699,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-22702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/22702","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/comments?post=22702"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/22702\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/22699"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=22702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=22702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=22702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}