Agricultural industrial vaj tse xav tau kev tsim kho sai, tus nqi qis thiab kev ua haujlwm tsis muaj teeb meem tsawg kawg 20 xyoo.
Niaj hnub no cov xwm txheej kev ua lag luam tso cov kev xav tau tshwj xeeb ntawm kev siv hluav taws xob ntawm cov tsev zoo li no. Txij li thaum feem ntau ntawm cov cua sov los yog txias poob tshwm sim nyob rau hauv lub tsev lub hnab ntawv, qhov no ncaj qha ua rau cov nqi zog thiab, yog li ntawd, ntau lawm nqi.
Kev khaws cov txiv hmab txiv ntoo thiab zaub muaj nruj heev rau qhov kub thiab av noo. Piv txwv li, qos yaj ywm, eggplants, dib, txiv lws suav thiab kua txob yog khaws cia ntawm qhov kub ntawm 0 mus rau +8 degree . Thiab qhov ntsuas kub no yuav tsum tau tswj xyuas txhua lub sijhawm.
Nws yog ib qho tsim nyog los tsim cov tsev cog khoom kaw thiab tswj lossis hloov cov pa oxygen tsawg kom tiv thaiv cov khoom tsis zoo. Ua li no, lub neej cia txias ntawm cov khoom yuav txuas ntxiv los ntawm 2-3 hli mus rau 6-8 hli.
Tsis tas li ntawd, tus nqi kawg ntawm cov khoom raug cuam tshuam los ntawm cov nqi pib tsim khoom. Txhawm rau txo cov nqi, siv cov khoom siv tsawg dua. Yog li ntawd, cov tsev ua liaj ua teb yuav tsum tau ua los ntawm cov khoom siv hnyav thiab ruaj khov nrog cov thermal conductivity tsawg.
Kev ua cov nqaij, ntses, zaub thiab txiv hmab txiv ntoo yuav tsum muaj ib puag ncig uas huv si li sai tau. Sandwich panels yog dej-resistant: lawv yog cov tshuaj inert thiab lom ruaj khov. Lawv tsis lwj raws sijhawm. Lawv resistant rau ob qho tib si acidic thiab alkaline ib puag ncig. Nws tsis rot thiab tsis raug rau cov teeb meem tshwm sim ntawm nas thiab kab.
Qhov zoo tshaj plaws ntawm PUR ua npuas ncauj sandwich panels yog cov pob qij txha kaw, uas tsis tas yuav muaj cov khoom txuas ntxiv rau kev sib dhos.
PIR yog cov nplaim hluav taws kub-retardant polyurethane ua npuas ncauj uas hu ua thermosetting polymer yog polyisocyanurate. Thaum kub kub, nws tiv thaiv kev sib kis ntawm nplaim taws. Yog li ntawd, siv PIR panels, koj tuaj yeem tsim cov qauv nrog kev nruj tshwj xeeb rau kev tiv thaiv hluav taws. Qhov no yog thawj qhov zoo ntawm kev siv PIR insulating sandwich panels hauv kev tsim kho.
Siv insulating sandwich panels ua los ntawm polyurethane ua npuas ncauj, chav tsev khaws cov txiv hmab txiv ntoo, chav txias los yog ua cov nroj tsuag tuaj yeem ua rau lub sijhawm luv tshaj plaws. Cov khoom pov thawj noo noo ntawm polyurethane ua npuas ncauj tso cai rau koj nruab nws txhua lub sijhawm xyoo.
Vim lawv qhov hnyav tsawg, PIR panels yooj yim dua los tuav ntawm qhov chaw tsim kho.