Muchinjiziri wekupisa unowana sei convection kupisa kupisa?
Midziyo yekupisa mundiro inonyanya kushandisa kuchinjisa pakati pezvinotonhora nezvinopisa kuti uwane kuchinjanisa kupisa, uye mvura-inochinjanisa mvura ndiyo imwe yenzira dzinoshandiswa zvikuru pakutsinhanisa kupisa.
Convection heat transfer ndiyo imwe yedzakajairika uye yakakosha nzira dzekufambisa kupisa. Munguva yekupisa kupisa, iyo yemvura yepakati inogara ichisangana neiyo heat exchanger wall. Nokudaro, kupisa kwekushisa kunowanikwa nekuenderera mberi kunopesana nekuyerera kwezvinwiwa. Iko kupisa kunobva kwachinjana kuburikidza nekusiyana kwekushisa pakati peheat exchangermadziro nemvura. Izvi ndizvo zvatiri kutaura nezvazvo nhasi: convection heat transfer.
Plate heat exchangers inobudirira convection heat exchange pakati pezvinwiwa zviviri zvine tembiricha dzakasiyana (kazhinji mvura inotonhora uye inopisa mvura) munzvimbo iri yoga kuburikidza nedhizaini yakasarudzika dhizaini, kumanikidza fluid conduction uye inobudirira kupisa kupisa nzira.Nheyo yayo yakakosha inogona kuputswa kuita matatu akakosha link: dhizaini dhizaini → kuyerera kwemvura → kupisa kupisa. Iyo chaiyo yekuita maitiro ndeaya anotevera:
Kupisa kwekushisa kwechigadziro chekupisa kweplate kunoenderana zvakanyanya nekugadzirwa kwakakosha kwemahwendefa ekutsinhanisa kupisa. Aya maumbirwo anotarisa zvakananga kuyerera uye kupisa kwenzvimbo yemvura, uye ndiyo hwaro hwe convective kupisa kupisa:
Izvo zvakakosha zve convective heat transfer isanganiswa ye "macro{{0}fluid flow + molecular micro-heat transfer". Plate heat exchangers anoshandisa simba rekunze (mapombi, mafeni) kumanikidza kuyerera kwemvura, kutyaira nzira yekupisa kupisa mumatanho maviri:
Inotyairwa nemapombi ekunze, mvura inotonhora uye inopisa inopinda mumatanho akazvimirira ekuyerera:
Mvura inotonhora inopinda mune imwe seti yematanho ekuyerera kubva ku "inotonhora mvura inopinza," inoyererawo nenzira ine mhirizhonga, ichichinjanisa kupisa nemahwendefa.
Nekuda kwepakati diki diki pakati pematanho ekuyerera (kazhinji 2-5 mm), iyo fluid "inosvinwa" panguva yekuyerera, ichiwedzera kuwedzera kuyerera kwemhirizhonga uye kudzivirira kudzika kwemvura kwenzvimbo kunogona kuderedza kupisa kwekufambisa kushanda.
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Mhedzisiro ye convective kupisa kupisa ndeye "kutamisa kupisa kubva kune inopisa mvura kuenda kumvura inotonhora". Iyo ndiro inoshanda seyakasarudzika uye kupisa kufambisa svikiro, ichiita basa rakakosha mukutamisa kupisa. Inopedzwa mumatanho matatu:
Chekutanga: Thermal fluid → Plate (Convection heat transfer)
Kana mvura inopisa ichiyerera zvine mutsindo, -mamorekuru etembiricha anodhumhana zvine chisimba nepamusoro pendiro, achiendesa kupisa mundiro kuburikidza ne "convection" (panguva ino, tembiricha yedivi rendiro iri padyo nemvura inopisa inowedzera).
Kechipiri: mukati mendiro (kupisa conduction)
Ma plates akagadzirwa nesimbi (aine high thermal conductivity, sesimbi isina simbi (inenge 16W/(m・K) uye titanium alloy (inenge 17W/(m・K))) Kupisa kunotamiswa nekukasika kubva-kurutivi rwekupisa (kudivi rinopisa) kuenda kwakadzikira{4}}tembiricha yeplateta mukati mechikamu chinotonhora."
Kechitatu: Ndiro → Mvura inotonhora (convection heat transfer):
Kudzikira-kurutivi rwekupisa kwendiro kunobata mvura inotonhora, uye kuburikidza nekudhumhana kwemamorekuru emvura inotonhora mukuyerera kwemhepo ine mhirizhonga, kupisa kunotakurwa kumvura inotonhora zvakare kuburikidza ne "convection" (panguva iyi tembiricha yemvura inotonhora inowedzera uye tembiricha yemvura inopisa inodzikira).
Mukuwedzera kune misimboti yakakosha, iyo inotevera dhizaini yedhizainiheat exchangerinopawo zvivimbiso zve convective heat transfer: Detachable structure: inochengetedza utsanana.
Kazhinji, nokuti midhiya miviri inoshandiswa yakasiyana, kuyerera kwavo mukati memichina yakasiyanawo, iyo inogona kutungamirira kune misiyano yakakura mu convective heat transfer.Convective heat transfer inowanzoparadzaniswa kuva mamiriro maviri. Imwe ndeye yakasikwa convection heat transfer, inova kuyerera kwekushisa kwekufambisa kunogadzirwa netembiricha dzakasiyana uye densities yemedia miviri kuburikidza nemadziro. Yechipiri inomanikidzwa convection kupisa kutengesa, iyo inoyerera kupisa kwekushisa kunokonzerwa nekunze kwekumanikidzwa kwemasimba (akadai semapombi, mafeni nemimwe midziyo) .Panyaya yekumanikidzirwa kutenderera, kuyerera kwemvura pachayo kuchave kwakakwirira kudarika kuyerera kwechisikigo, uye kushanda kwe convective heat transfer kuchavawo kwakakwirira. Semuenzaniso, kupisa kwekushisa kwemhepo mumhepo inoyerera inongova 5 ~ 25W / (m2. dhigirii), asi kana kumanikidzika kuyerera kunoitwa, kupisa kwekushisa kwemhepo kunowedzera kusvika 10 ~ 100W (m2. degree).
Pane zvinhu zvakawanda zvinokanganisa kushanda kwekushisa kwepakati, senge chimiro chechimiro chemvura yepakati pachayo: density, chaiyo yekupisa simba, thermal conductivity, nezvimwewo, pamwe nekugadzirwa kwemidziyo yekutsinhanisa kupisa pachayo: saizi yendiro yekutsinhana kupisa, chimiro chendiro, nezvimwewo, uye nzira yekuyerera yepakati mumidziyo, zvese izvi zvinokanganisa kunyatsoita kwe convective kupisa kupisa.