Thaum nws los txog rau kev rwb thaiv tsev, nws yog ib qho tseem ceeb rau cov neeg ua vaj tse thiab cov tswv tsev kom nkag siab txog ntau yam kev ntsuas siv los ntsuas nws qhov ua tau zoo. Ntawm cov kev ntsuas no, K-tus nqi, U-tus nqi, thiab R-tus nqi yog cov feem ntau siv. Cov nqi no txhua tus qhia txog kev ua haujlwm thermal ntawm cov khoom rwb thaiv tsev, suav nrog FEF (ua npuas ncauj extruded polystyrene) rwb thaiv tsev. Tsab xov xwm no yuav tshawb nrhiav kev sib raug zoo ntawm cov nqi no thiab lawv cuam tshuam li cas rau cov khoom rwb thaiv tsev FEF.
K tus nqi: coefficient ntawm thermal conductivity
K-tus nqi, lossis thermal conductivity, yog qhov ntsuas ntawm cov khoom siv lub peev xwm los coj cua sov. Nws chav tsev yog Watts ib 'meter'-Kelvin (W/m·K). Tus nqi K qis dua, qhov zoo dua qhov rwb thaiv tsev, tab sis qhov no txhais tau tias cov khoom siv coj cua sov tsis zoo. Rau cov ntaub ntawv rwb thaiv tsev FEF, tus nqi K yog qhov tseem ceeb vim tias nws cuam tshuam ncaj qha rau cov khoom siv lub peev xwm los tiv taus cua sov. Feem ntau, cov khoom rwb thaiv tsev FEF muaj tus nqi K qis, uas ua rau lawv muaj txiaj ntsig zoo hauv ntau yam kev siv, los ntawm cov tsev nyob mus rau cov tsev lag luam.
U-nqi: Tag nrho cov coefficient ntawm kev hloov pauv cua sov
Tus nqi U qhia txog qhov coefficient ntawm kev hloov pauv cua sov ntawm ib lub tsev, xws li phab ntsa, ru tsev lossis hauv pem teb. Nws yog qhia hauv Watts ib square meter-Kelvin (W/m²·K) thiab tsis yog tsuas yog xav txog cov khoom siv rwb thaiv tsev xwb, tab sis kuj suav nrog cov teebmeem ntawm qhov sib txawv ntawm huab cua, av noo thiab lwm yam. Tus nqi U qis dua, qhov rwb thaiv tsev zoo dua, vim nws txhais tau tias cua sov tsawg dua poob lossis tau txais los ntawm lub tsev. Thaum soj ntsuam cov khoom rwb thaiv tsev FEF, tus nqi U yog qhov tseem ceeb kom nkag siab tias nws yuav ua haujlwm li cas hauv kev siv tiag tiag, tshwj xeeb tshaj yog thaum ua ke nrog lwm cov khoom siv hauv tsev.
Tus nqi R: kev tiv thaiv rau cua sov ntws
Tus nqi R ntsuas qhov kev tiv taus cua sov ntawm cov khoom siv, qhia tias nws tiv taus cua sov npaum li cas. Nws cov chav ntsuas yog square meter-Kelvin ib watt (m²·K/W). Tus nqi R siab dua, qhov rwb thaiv tsev zoo dua, txhais tau tias cov khoom siv thaiv kev hloov pauv cua sov zoo dua. Cov khoom rwb thaiv tsev FEF feem ntau muaj tus nqi R siab dua, ua rau lawv zoo tagnrho rau kev tsim kho kom txuag hluav taws xob. Tus nqi R yog qhov tseem ceeb rau cov tswv tsev uas xav txo cov nqi hluav taws xob thiab ua kom lawv qhov chaw nyob xis nyob dua.
Kev sib raug zoo ntawm tus nqi K, tus nqi U thiab tus nqi R hauv FEF rwb thaiv tsev
Kev nkag siab txog kev sib raug zoo ntawm K-tus nqi, U-tus nqi thiab R-tus nqi yog qhov tseem ceeb rau kev ntsuam xyuas kev ua tau zoo ntawm cov khoom siv rwb thaiv tsev FEF. K-tus nqi tsom mus rau cov khoom siv nws tus kheej, R-tus nqi ntsuas nws qhov kev tiv thaiv, thiab U-tus nqi muab daim duab dav dua ntawm kev ua tau zoo ntawm lub tsev.
Yuav kom suav cov nqi no ua lej, siv cov qauv hauv qab no:
- **Tus nqi R = 1 / Tus nqi K**: Kab zauv no hais tias thaum tus nqi K txo qis (qhia tias muaj kev ua tau zoo dua ntawm kev ua kom sov), tus nqi R nce ntxiv, txhais tau tias kev ua haujlwm rwb thaiv tsev zoo dua.
- **Tus nqi U = 1 / (Tus nqi R + lwm cov resistors)**: Cov mis no qhia tau hais tias tus nqi U tsis yog tsuas yog cuam tshuam los ntawm tus nqi R ntawm cov txheej rwb thaiv tsev xwb, tab sis kuj los ntawm lwm yam xws li qhov sib txawv ntawm huab cua thiab cov choj thermal.
Rau cov khoom siv rwb thaiv tsev FEF, cov nqi K qis ua rau muaj cov nqi R siab dua, uas ua rau cov nqi U qis thaum koom ua ke rau hauv cov rooj sib txoos hauv tsev. Qhov kev cuam tshuam no ua rau FEF rwb thaiv tsev yog qhov kev xaiv nrov rau cov kws kes duab vajtse thiab cov neeg ua vaj tse nrhiav kev tsim qauv siv hluav taws xob zoo.
Hauv kev xaus, K-tus nqi, U-tus nqi thiab R-tus nqi yog cov cim qhia sib txuas uas muab kev nkag siab zoo rau kev ua haujlwm thermal ntawm FEF cov khoom rwb thaiv tsev. Los ntawm kev nkag siab txog cov kev sib raug zoo no, cov neeg tsim kho thiab cov tswv tsev tuaj yeem txiav txim siab txog cov ntaub ntawv rwb thaiv tsev, thaum kawg tsim kom muaj chaw nyob zoo dua thiab xis nyob. Raws li kev siv hluav taws xob txuas ntxiv mus ua qhov tseem ceeb tshaj plaws hauv kev lag luam kev tsim kho, qhov tseem ceeb ntawm cov nqi no tsuas yog nce ntxiv, yog li lawv yuav tsum tau xav txog thaum xaiv cov kev daws teeb meem rwb thaiv tsev.
Lub sijhawm tshaj tawm: Tsib Hlis-17-2025
