Thaum xaiv cov kav dej insulated, ntau tus neeg yuav khoom cia siab rau qhov yooj yim intuition: lub thicker lub rwb thaiv tsev txheej, qhov zoo dua thermal rwb thaiv tsev kev ua tau zoo- yog li lawv tsuas hais kom cov chaw tsim khoom ntxiv ob peb centimeters ntxiv. Thaum lub tswv yim no suab zoo, nyob rau hauv qhov tseeb engineering xyaum, ntau dhau ntawm rwb thaiv tsev thickness tsis tsuas yog nkim nyiaj tab sis muaj peev xwm txawm backfire, accelerating tsis ua hauj lwm ntawm cov kav dej.
Cia peb pib nrog qhov yooj yim tshaj qhov teeb meem tsis pom: qhov kub thiab txias ntau dhau. Lub luag haujlwm tseem ceeb ntawm cov txheej txheem rwb thaiv tsev yog kom txo qhov kub poob; Txawm li cas los xij, nws ib txhij tiv thaiv cov yeeb nkab ua haujlwm sab hauv los ntawm dissipating cua sov sab nraud. Yog tias cov txheej rwb thaiv tsev yog tuab heev, cov yeeb nkab ua haujlwm steel tseem raug rau lub sijhawm ntev mus rau qhov kub thiab txias tshaj nws qhov kev txwv, yog li ua kom carbonization, nkag mus, thiab corrosion. Qhov no yog qhov tseem ceeb tshwj xeeb hauv cov kav dej kub sib txuas: thaum cov yeeb nkab phab ntsa kub tseem nce siab rau lub sijhawm ntev, kev tiv thaiv cathodic txo qis, thiab kev pheej hmoo ntawm electrochemical corrosion nce ntau. Qhov no yog qhov laj thawj tseem ceeb vim li cas qee cov yeeb nkab ntu nrog cov rwb thaiv tsev ntau dhau ua tau tsim tawm sai dua li cov txheej txheem rwb thaiv tsev tuab.
Qhov thib ob, qhov txo qis hauv kev poob cua sov tsis yog ncaj qha proportional rau lub rwb thaiv tsev thickness. Thaum lub thermal tiv thaiv ntawm ib txheej rwb thaiv tsev nce nyob rau hauv ib tug kwv yees li linear zam nrog nws thickness, ib zaug lub thickness mus txog ib tug tej yam pib, lub zog -txuag cov txiaj ntsim tau los ntawm ntxiv thickening sai sai. Thaum sib piv cov khoom siv tus nqi ntawm kev ntxiv ib centimeter ntawm rwb thaiv tsev tiv thaiv tus nqi ntawm lub tshav kub lub zog txuag, tus nqi feem ntau tshaj qhov taw tes ntawm kev lag luam equilibrium. Hauv lwm lo lus, kev siv nyiaj ntxiv tsis tau txais txiaj ntsig rov qab los ntawm kev txuag hluav taws xob; Hloov chaw, nws nyob hauv qhov ntim loj dua ntawm qhov chaw hauv av lossis cov yeeb nkab gallery cross-section, yog li ua rau nyuaj rau kev tsim kho thiab kev ua haujlwm.
Ib qho tseem ceeb thib peb suav nrog cov kev txwv uas tau ua los ntawm kev ua haujlwm tiag tiag. Cov khoom tsis sib xws-xws li li qub, lub luj tshib, thiab cov pob qij txha nthuav dav - tsis tuaj yeem muab qhwv nrog cov rwb thaiv tsev tuab zoo ib yam li cov yeeb nkab ncaj nraim tuaj yeem ua tau. Yog tias qhov rwb thaiv tsev ntawm cov ntu ncaj yog ua kom tuab heev, qhov ua rau qhov sib txawv ntawm cov rwb thaiv tsev tuab ntawm cov ntu no thiab cov "tsis muaj zog txuas" (cov khoom tsis sib xws) tsim cov "thermal txuas hniav." Thaum tshav kub kub dissipates hnyav heev los ntawm cov junctions, ua rau undermining tag nrho cov cua sov- poob txo uas cov thickened rwb thaiv tsev ntawm cov ncaj seem yog npaj kom tiav.
Yog li, yuav ua li cas txiav txim siab qhov tsim nyog rwb thaiv tsev thickness? Txoj hauv kev uas txhim khu kev qha tshaj plaws yog ua kom sov- poob kev xam raws li qhov tshwj xeeb tsis muaj- suav nrog cov dej kub, txoj kab uas hla ntawm cov kav dej, ib puag ncig, thiab kev pabcuam lub neej ua haujlwm- nruj raws li cov qauv tsim (xws li GB/T 29047 lossis CJJ 34). Los ntawm kev ua li ntawd, ib tus tuaj yeem txheeb xyuas qhov "kev pom zoo ntawm kev lag luam" uas txo qis tag nrho cov nqi hluav taws xob ntawm cov kav dej. Tsis yog tsuas yog ua ib qho kev txiav txim siab, spur- ntawm - lub - lub sijhawm xav tau "ntxiv ob centimeters ntawm tuab."