Ɔkwan bɛn so na ɔhyew a wɔde sesa nneɛma no nya convection ɔhyew a wɔde kɔ baabi foforo?
Plate heat exchangers titiriw de convection di dwuma wɔ abien awɔw ne ɔhyew media ntam ma wonya ɔhyew nsakrae, na Liquid-nsu sesa yɛ akwan a wɔtaa fa so yɛ ɔhyew sesa no mu biako.
Convection Ɔhyew a wɔde kɔ baabi foforo no yɛ akwan a wɔtaa fa so de ɔhyew kɔ no mu biako. Bere a ɔhyew no rekɔ so no, nsu a ɛwɔ mu no ne ɔhyew sesa ɔfasu no di nkitaho bere nyinaa. Enti, ɔhyew a ɛkɔ nipadua no mu no nam nsu a ɛkɔ so countercurrent a ɛsen no so na ɛba. Afei wɔde ɔhyew no sesa ɔhyew mu nsonsonoe a ɛda .Ɔhyew a wɔde sesa nneɛma .ɔfasu ne nsu a ɛwɔ mu no. Eyi ne nea yɛreka ho asɛm nnɛ: convection heat transfer.
Mprɛte mu ɔhyew sesafo nya convection ɔhyew nsakrae a etu mpɔn ntam nsu abien a ɛsono ɔhyew (a ɛtaa yɛ nwini nsu ne nsu a ɛyɛ hyew) wɔ tebea a atew ne ho mu denam mprɛte nhyehyɛe soronko nhyehyɛe, nsu a wɔhyɛ no conduction ne ɔhyew a ɛkɔ soro kwan so yiye.Its core principle betumi abubu mu ayɛ abiɛsa titiriw nkitahodi: structural design → nsu a ɛsen → ɔhyew a ɛkɔ. Nneɛma pɔtee a wɔde di dwuma no te sɛ nea edidi so yi:
Ɔhyew tumi a ɛwɔ mprɛte mu ɔhyew sesa no gyina ɔhyew a wɔde sesa mprɛte no nhyehyɛe titiriw so titiriw. Saa nhyehyeɛ yi na ɛkyerɛ nsuo no nsuo a ɛsene ne nsuo a ɛkɔ mu no tẽẽ, na ɛno na ɛgyina ɔhyew a ɛkɔ so no so:
Nneɛma a ɛho hia wɔ convective heat transfer mu ne "macro-nsu a ɛsen + molecular micro-HEAT transfer" a wɔaka abom. Mprɛte mu ɔhyew a wɔde sesa nneɛma no de abɔnten tumi (pmpum, fan) di dwuma de hyɛ nsu a ɛsen, na ɛma ɔhyew no kɔ so wɔ anammɔn abien mu:
Nsu a ɛyɛ nwini ne nea ɛyɛ hyew a ɛwɔ abɔnten pɔmpɛ ahorow no mu no hyɛn wɔn mu biara mu a ɛde ne ho a ɛsen fa nsu mu:
Nsu a ɛyɛ nwini no hyɛn nsu a ɛsen fa akwan foforo so fi "nsu a ɛyɛ nwini a ɛkɔ mu," a ɛsan nso sen wɔ ɔkwan a ɛyɛ basabasa so, na ɛne mprɛte no sesa ɔhyew.
Esiane nsonsonoe nketenkete koraa a ɛda nsu a ɛsen no ntam (mpɛn pii no 2-5 mm) nti, nsu no "pia" bere a nsu no sen no, na ɛma nsu a ɛsen a ɛyɛ basabasa no yɛ kɛse bio na esiw nsu a ɛwɔ mpɔtam hɔ a ebetumi atew ɔhyew a ɛkɔ nipadua no mu no ano.
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Convective heat transfer no mu titiriw ne "ɔhyew a efi nsu a ɛyɛ hyew mu kɔ nsu a ɛyɛ nwini mu". Mprɛte no yɛ adwuma sɛ ade a ɛma obi ho tew na ɛma ɔhyew kɔ baabi foforo, na edi dwuma titiriw wɔ ɔhyew a wɔde kɔ baabi foforo mu. Wɔawie no wɔ anammɔn abiɛsa mu:
Nea edi kan: nsu a ɛyɛ hyew → mprɛte (ɔhyew a ɛkɔ soro) .
Sɛ nsu a ɛyɛ hyew no sen basabasa a,-temperature molecules a ɛkorɔn no ne mprɛte no ani bɔ denneennen, na ɛde ɔhyew kɔ mprɛte no so fa "nsu a ɛkɔ mu" (saa bere yi de, mprɛte no fã a ɛbɛn nsu a ɛyɛ hyew no kɛse no hyew kɔ soro).
Bere a ɛto so abien: wɔ mprɛte no mu (ɔhyew conduction) .
Wɔde dade (a ɔhyew a ɛkɔ soro wom, te sɛ dade a ɛnyɛ den (bɛyɛ 16W/(M・K) ne titanium aduru (bɛyɛ 17W/(M・K)) na ɛyɛ mprɛte no.
Bere a ɛto so abiɛsa: Mprɛte → Nsu a ɛyɛ nwini (ɔhyew a ɛkɔ nsu no mu):
Mprɛte no fã a ɛba fam-temperature no ne nsu a ɛyɛ nwini no di nkitaho, na ɛdenam nsu a ɛyɛ nwini no molecule a ɛbɔ mu wɔ nsu a ɛsen no mu no so no, ɔhyew no san kɔ nsu a ɛyɛ nwini no mu denam "nsu a ɛkɔ mu" so (saa bere yi no nsu a ɛyɛ nwini no hyew kɔ soro na nsu a ɛyɛ hyew no hyew so tew).
Nnyinasosɛm atitiriw no akyi no, mprɛte no ho nhyehyɛe ho nsɛm a edidi so yi .Ɔhyew a wɔde sesa nneɛma .Afei nso fa ahotoso ma convective heat transfer: Detachable Structure: Ɛhwɛ ahotew so.
Mpɛn pii no, esiane sɛ nsɛm ho amanneɛbɔ abien a wɔde di dwuma no yɛ soronko nti, wɔn flow dynamics a ɛwɔ nnwinnade no mu nso yɛ soronko, a ebetumi ama nsonsonoe kɛse aba convective heat transfer.convective heat transfer mu no, wɔtaa kyekyɛ mu ma ɛyɛ tebea abien. Biako ne natural convection heat transfer, a ɛyɛ flow heat transfer a ɛnam ɔhyew ne densities ahorow a ɛwɔ media abien so de ba fa ɔfasu no mu. Nea ɛto so abien ne forced convection heat transfer, a ɛyɛ flow heat transfer a efi abɔnten nhyɛso tumi (te sɛ pɔmpɛ, fan ne nnwinnade afoforo).Wɔ asɛm a ɛfa forced convection ho no, nsu no ankasa nsu no bɛkɔ soro asen nsu a ɛsen wɔ abɔde tebea mu, na ɔhyew a ɛkɔ soro no nso bɛyɛ kɛse. Sɛ nhwɛso no, ɔhyew a ɛkɔ wim wɔ abɔde mu nsu a ɛsen mu no yɛ 5 ~ 25W/(m2.℃), nanso sɛ wɔyɛ nsu a ɛkɔ so no a, ɔhyew a ɛkɔ soro no nsusuwii no kɔ soro kodu 10 ~ 100W(M2.℃).
Nneɛma pii wɔ hɔ a ɛka ɔhyew a ɛkɔ baabi foforo a ɛwɔ medium no mu, te sɛ nsu a ɛwɔ nsu no ankasa mu no honam fam su: ɔhyew tumi pɔtee, ɔhyew a ɛkɔ nipadua no mu, ne nea ɛkeka ho, ne sɛnea wɔyɛ ɔhyew a wɔde sesa nneɛma no ankasa: ɔhyew a wɔde sesa mprɛte no kɛse, mprɛte no nsusuwii, ne nea ɛkeka ho, ne ɔkwan a wɔfa so ma nsu no sen wɔ nnwinnade no mu, a ne nyinaa bɛka ɔhyew a ɛkɔ ntini no mu no yiye ankasa.