Cov ua npuas dej polyurethane txau (SPF) yog cov khoom siv rwb thaiv tsev uas siv tau ntau yam raws li cov tshuaj lom neeg sib xyaw, thiab vim tias cov khoom siv txau nrog ua npuas dej tsis hloov pauv raws sijhawm, nws feem ntau siv rau hauv lub kaw lus rwb thaiv tsev ntawm cov tsev. Nws muaj ob lub ntsiab lus tseem ceeb: isocyanates thiab cov khoom sib xyaw ua ke, suav nrog polyols thiabcov tshuaj catalysts, uas tau sib xyaw ua ke ntawm qhov chaw los ua ib txheej rwb thaiv tsev muaj zog. Muaj ob hom ua npuas dej tseem ceeb: ua npuas dej qhib thiab ua npuas dej kaw, txhua hom muaj cov yam ntxwv thiab kev siv sib txawv.
Qhib-Cell Tsuag Ua Npuas Ncauj
Cov tshuaj tsuag qhib qhov muaj tus nqi qis dua thiab nthuav dav dua, thiab tuaj yeem xaiv thaum sau cov chaw loj dua. Vim nws loj duakev hloov pauv tau yooj yim, nws tuaj yeem tshem tawm tau yooj yim dua thiab kuj tuaj yeem muaj cov rwb thaiv tsev rau cov ces kaum nyuaj mus txog. Ua npuas ncauj qhib-cell muaj cov qauv cell zoo ib yam li cov npuas me me nrog qhov qhib uas tso cai rau huab cua ncig. Thaum nws muab cua nruj, nws tsis muab cov dej noo thaiv vim nws qhov permeability tso cai rau dej hla dhau. Nws muaj tus nqi R (qhov ntsuas ntawm nws lub peev xwm rwb thaiv tsev) ntawm kwv yees li 3.5 txog 3.8 ib nti, ua rau nws haum rau cov ntawv thov uas xav tau cua ntws tab sis kev tiv thaiv dej noo tsis tseem ceeb. Nws feem ntau siv rau hauv phab ntsa sab hauv, attics, thiab thaj chaw uas xav tau kev rwb thaiv suab, vim nws qhov kev tsim kho qhov qhib kuj muab kev txo suab nrov zoo heev.
Cov Tshuaj Tsuag Kaw-Cell
Cov qhov uas sib sau ua ke kom nruj dua hu ua cov ua npuas kaw. Cov ua npuas kaw muaj qhov ntom dua thiab tawv dua, tsim kom muaj kev tiv thaiv huab cua thiab dej noo. Nws cov qhov uas sib sau ua ke nruj tiv thaiv huab cua thiab dej noo kom tsis txhob nkag mus, ua rau nws yog ib qho kev tiv thaiv dej noo zoo. Nws nthuav dav ntawm qhov nrawm dua li cov ua npuas qhib, tab sis rwb thaiv tsev zoo dua, nrog tus nqi R ntawm kwv yees li 6.0 ib nti. Tus nqi R siab dua, cov ua npuas kaw tiv thaiv cua sov tau zoo dua, ua rau nws zoo tagnrho rau kev siv sab nraud uas xav tau tus nqi rwb thaiv tsev siab dua thiab kev tiv thaiv dej noo, xws li ru tsev, lub hauv paus, thiab phab ntsa. Txawm hais tias tus nqi siab dua, cov ua npuas kaw feem ntau nyiam siv rau hauv thaj chaw uas muaj chaw tsawg tab sis xav tau kev rwb thaiv tsev ntau tshaj plaws.
Hauv kev xaus lus, ob qho tib si qhib-cell thiab kaw-cell tsuag ua npuas ncauj yog cov khoom rwb thaiv tsev zoo tab sis txawv ntawm lawv cov yam ntxwv thiab kev siv. Qhib-cell ua npuas ncauj pheej yig dua, nthuav dav dua, thiab tso cai rau huab cua ncig, thaum kaw-cell ua npuas ncauj yog denser dua, ua haujlwm ua ib qho thaiv dej noo, thiab muab R-tus nqi siab dua. Kev xaiv ntawm ob qho tib si nyob ntawm qhov xav tau tshwj xeeb ntawm cov haujlwm, suav nrog kev tiv thaiv dej noo, kev ua haujlwm rwb thaiv tsev zoo, thiab peev nyiaj.
Lub sijhawm tshaj tawm: Cuaj hlis-24-2024