Dab tsi yog qhov txawv ntawm thermal conductivity thiab tshav kub hloov coefficient?
Apr 20, 2026
Muaj 2 nqe lus zoo li yuav luag zoo ib yam tab sis cov teeb meem sib txawv kiag li, uas yooj yim tsis meej pem, hauv qab kev sib tawg ceev.
1.Thermal conductivity (λ) – kuj hu ua k-tus nqi
Hauv qab no koj tuaj yeem nkag siab zoo dua: Siv 1 meter tuab ntawm cov khoom. Ua rau ib sab 1K sov dua li lwm qhov. Thermal conductivity yog npaum li cas tshav kub dhau los ntawm 1 sqm ntawm cov khoom nyob rau hauv 1s, chav tsev yog W / (m·K).
Txoj kev hlub yog dab tsi? Cov khoom muaj pes tsawg leeg, ntom, noo noo cov ntsiab lus, thiab kub.
Dab tsi tsis yog? Loj, zoo li, thiab thickness. Thermal conductivity yog purely txog cov khoom nws tus kheej. Yog li ob daim ntawm tib cov khoom muaj tib lub thermal conductivity, txawm tias lawv loj npaum li cas los yog me me.
Rau iav, tus nqi raug yog kwv yees li 1 W / (m·K).
2. Heat transfer coefficient (K lossis U-tus nqi)
Qhov no yog ib qho nyuaj me ntsis. Nws ntsuas qhov kub npaum li cas dhau los ntawm ib square meter ntawm cov qauv - zoo li phab ntsa, lub qhov rais, lossis iav vaj huam sib luag - thaum huab cua kub ntawm txhua sab txawv ntawm 1K. Chav tsev kuj yog W / (m²·K).
Ntawm no yog ob qho qauv sib txawv txhais tau li cas:
JGJ/T 151 hais tias: Rau lub qhov rais lossis kab hlau rhuav phab ntsa, U- tus nqi yog cov cua sov hloov mus rau ib lub sijhawm, ib chav tsev, ib qhov ntsuas kub qhov sib txawv ntawm huab cua sab hauv thiab sab nraum zoov.
GB/T 22476 hais tias: Rau cov iav insulating (IGU), U- tus nqi yog ntsuas nyob rau hauv nruab nrab ntawm cov iav - tsis quav ntsej txog ntug - nyob rau hauv khov kho- xeev xwm txheej. Tib lub tswv yim: cua sov ib chav tsev lub sij hawm, ib chav tsev cheeb tsam, ib tug℃ntawm kub txawv.
Tsis zoo li thermal conductivity, U- tus nqi nyob ntawm ntau dua li cov khoom siv xwb. Nws kuj mob siab txog thickness, ntxiv rau ciam teb tej yam kev mob xws li radiative tshav kub hloov thiab convective tshav kub hloov. Yog vim li cas ob lub qhov rais ua los ntawm tib lub iav tseem tuaj yeem muaj qhov sib txawv U- nqi.
