Yog tias koj ua haujlwm hauv kev tsim kho lossis npaj yuav rwb thaiv tsev, tej zaum koj yuav tau ntsib lo lus "water vapor permeability" (WVP). Tab sis WVP yog dab tsi tiag? Vim li cas nws thiaj tseem ceeb thaum xaiv cov ntaub ntawv rwb thaiv tsev?
Qhov permeability ntawm cov pa dej (WVP) yog qhov ntsuas ntawm lub peev xwm ntawm cov khoom siv los tso cai rau cov pa dej hla mus. WVP yog ib qho tseem ceeb uas yuav tsum xav txog thaum nws los txog rau kev rwb thaiv tsev vim nws cuam tshuam rau kev ua haujlwm tag nrho ntawm cov rwb thaiv tsev hauv kev tswj hwm ib puag ncig hauv tsev zoo thiab txuag hluav taws xob.
Cov ntaub ntawv rwb thaiv tsev uas muaj WVP qis tuaj yeem tiv thaiv kom tsis txhob muaj dej noo ntau hauv cov phab ntsa thiab ru tsev. Qhov no tseem ceeb heev vim tias dej noo ntau tuaj yeem ua rau pwm loj hlob thiab ua rau puas tsuaj rau cov qauv raws sijhawm. Ntawm qhov tod tes, cov ntaub ntawv uas muaj WVP siab tso cai rau dej noo ntau dua, uas yuav pab tau rau qee qhov xwm txheej uas xav tau kev tswj dej noo.
Yog li, yuav ua li cas thiaj txiav txim tau WVP ntawm cov ntaub ntawv rwb thaiv tsev? WVP ntawm cov khoom siv feem ntau ntsuas hauv grams ib square meter ib hnub (g/m²/hnub) thiab tuaj yeem kuaj tau siv cov txheej txheem txheem xws li ASTM E96. Cov kev kuaj no suav nrog kev muab cov khoom siv rau hauv cov xwm txheej tswj tau av noo thiab ntsuas qhov nrawm uas cov dej pa hla dhau cov qauv dhau ib lub sijhawm.
Thaum xaiv cov ntaub ntawv rwb thaiv tsev rau ib qhov project, nws yog ib qho tseem ceeb uas yuav tsum xav txog huab cua thiab lub tsev cov kev xav tau tshwj xeeb. Piv txwv li, nyob rau hauv cov huab cua txias uas xav tau cua sov feem ntau ntawm lub xyoo, nws yog ib qho tseem ceeb uas yuav tsum xaiv cov rwb thaiv tsev nrog WVP qis dua kom tiv thaiv cov dej noo thiab kev puas tsuaj rau lub tsev. Ntawm qhov tod tes, nyob rau hauv cov huab cua kub thiab noo noo, cov ntaub ntawv uas muaj WVP siab dua yuav raug nyiam kom ua tiav kev tswj cov dej noo zoo dua thiab tiv thaiv cov dej noo hauv phab ntsa.
Muaj ntau hom khoom siv rwb thaiv tsev nyob hauv khw, txhua yam muaj nws tus yam ntxwv WVP. Piv txwv li, cov khoom siv rwb thaiv tsev ua npuas dej xws li polyurethane thiab polystyrene feem ntau muaj WVP qis dua, ua rau lawv tsim nyog siv rau hauv qhov chaw txias thiab ntub. Cellulose thiab fiberglass rwb thaiv tsev, ntawm qhov tod tes, muaj WVP siab dua, ua rau lawv zoo dua rau huab cua kub thiab noo noo.
Ntxiv rau qhov kev xav txog huab cua, qhov chaw thiab kev siv cov khoom rwb thaiv tsev kuj yuav tsum tau xav txog. Piv txwv li, cov khoom rwb thaiv tsev hauv qab nthab lossis qhov chaw nkag mus rau hauv av yuav xav tau cov khoom siv uas muaj WVP qis dua kom tiv thaiv cov dej noo kom tsis txhob nkag mus rau hauv cov phab ntsa hauv qab nthab. Qhov sib txawv, cov khoom rwb thaiv tsev hauv qab nthab yuav tau txais txiaj ntsig los ntawm cov khoom siv uas muaj WVP siab dua rau kev tswj cov dej noo zoo dua thiab tiv thaiv cov dej noo.
Xaus lus, qhov dej ntws permeability (WVP) yog ib qho tseem ceeb uas yuav tsum xav txog thaum xaiv cov ntaub ntawv rwb thaiv tsev rau ib qho project. Kev nkag siab txog cov yam ntxwv ntawm WVP ntawm cov ntaub ntawv sib txawv thiab lawv cuam tshuam li cas rau kev tswj cov dej noo thiab kev ua haujlwm ntawm lub tsev yog qhov tseem ceeb rau kev ua kom muaj ib puag ncig zoo thiab txuag hluav taws xob hauv tsev. Los ntawm kev xav txog koj qhov huab cua tshwj xeeb, qhov chaw, thiab daim ntawv thov rwb thaiv tsev, koj tuaj yeem txiav txim siab txog qhov rwb thaiv tsev zoo tshaj plaws rau koj qhov project.
Lub sijhawm tshaj tawm: Lub Ob Hlis-19-2024
