Txawm hais tias koj yog tus kws tsim qauv, tus neeg cog lus lossis tus tsim tawm, koj yuav tsum tau sib piv cov thermal kev ua tau zoo ntawm cov ntaub ntawv sib txawv rau qhov kev tsim kho yav tom ntej. Kev ua haujlwm thermal yog ib qho tseem ceeb hauv kev txiav txim siab lub zogefficiency ntawm cov tsev.
Tus nqi ntsuas kev ua haujlwm thermal
Txawm hais tias ntau qhov tseem ceeb yog siv los ntsuas qhov sib txawv ntawm cov khoom siv thermal, xws li C-tus nqi (thermal conductance) thiab K-tus nqi (kub hloov ntawm sab nraud thiab sab hauv lub tsev), qhov kev ua tau zoo ntawm cov khoom yog feem ntau. ntsuas siv peb thermal qhov tseem ceeb: lubcoefficient ntawm thermal conductivity (λ), thermal kuj (R) thiab thermal transmittance (U).
Tus nqi thermal conductivity coefficient (λ) yog dab tsi?
CovCoefficient ntawm thermal conductivity (λ)yog cov khoom tseem ceeb ntawm cov ntaub ntawv thiab muaj feem xyuam rau cov cua kub uas kis tau los ntawm ob lub ntsej muag ntawm ib qho chaw tiaj tus ntawm cov khoom, qhov qis dua qhov no tus nqi zoo dua thermal insulator cov khoom yog. Nws yog qhia nyob rau hauv units ntawm W / (mK).
Tus nqi thermal resistance (R) yog dab tsi?
CovR-tus nqiqhia qhovthermal tsis kam ntawm cov khoomlos yog nws muaj peev xwm tiv taus cua sov. Qhia tawm raws li m²K / W, R-tus nqi nyob ntawm qhov tuab ntawm cov khoom siv, tsis zoo li tus nqi lambda. Covsiab dua R-tus nqi ntawm cov khoom, qhov siab dua qhov thermal kujthiab yog li ntawd qhov ntau zog txuag nws muab.
Tus nqi thermal transmittance (U) yog dab tsi?
Feem ntau yuam kev suav hais tias tus inverse ntawm tusR-tus nqi, U-tus nqi tiag tiagntsuas thermal transmittance, los yog kub ceev npaum li cas txav los ntawm cov khoom muab, txawm tias nws yog tsim los ntawm ib qho khoom siv lossis ntau yam khoom. Zoo li R-tus nqi, U-tus nqi ntawm cov khoom lag luam kuj nyob ntawm nws cov tuab, txawm hais tias qhov sib txawv, qhov qis U-tus nqi qhia tau zoo dua rwb thaiv tsev.
Los xaus:
d=khoom thickness (m)
(λ): thermal conductivity - (W / mK) - Qhov qis dua tus nqi, qhov kev ua haujlwm zoo ntawm rwb thaiv tsev
R=d/λ : thermal resistance - (m2K/W) - Tus nqi siab dua, qhov zoo dua ntawm kev ua haujlwm rwb thaiv tsev
U=1/ summation R : kub poob tus nqi - (W/m2K) - Tus nqi qis dua, qhov zoo ntawm rwb thaiv tsev kev ua tau zoo