Rau cov cua txias hauv cov chaw zov me nyuam, centralized multi-zone systems nrog dej txias tshuab (chillers) feem ntau yog ntsia. Lawv muaj txiaj ntsig zoo dua li cov tshuab cua txias freon, vim tias cov cua txias ntawm cov khoom siv sab nraud thiab sab hauv tsis nkag mus rau hauv lub xeev gaseous, thiab compressor-condenser chav tsev ntawm lub chiller tuaj yeem ua haujlwm tsuas yog thaum kub nce mus rau qee theem. Ib qho ntawm cov lus nug tseem ceeb tshaj plaws thaum tsim lub tshuab chiller yog: dab tsi coolant yog qhov zoo tshaj plaws los siv? Qhov no tuaj yeem yog dej lossis cov kua dej ntawm cov dej cawv polyhydric - propylene glycol lossis ethylene glycol. Cia peb sim nkag siab qhov zoo thiab qhov tsis zoo ntawm txhua qhov kev xaiv.
Physics thiab chemistry
Los ntawm qhov pom ntawm lub cev muaj zog (kub muaj peev xwm, ceev, kinematic viscosity), dej yog suav tias yog qhov zoo tshaj plaws coolant. Tsis tas li ntawd, nws tuaj yeem raug nchuav rau hauv av lossis hauv cov kav dej. Hmoov tsis zoo, hauv peb lub latitudes, dej tsuas yog siv sab hauv tsev, vim nws khov ntawm 0 Β° C. Nyob rau tib lub sijhawm, qhov ceev ntawm lub coolant txo, thiab lub ntim nws occupies nce. Cov txheej txheem tsis sib xws thiab nws tsis tuaj yeem them nyiaj rau nws siv lub tank nthuav dav. Cov cheeb tsam khov yog cais tawm, lub siab zoo li qub ntawm cov yeeb nkab phab ntsa nce, thiab thaum kawg muaj qhov tawg tshwm sim. Aqueous daws ntawm polyhydric cawv tsis muaj qhov tsis zoo no. Lawv khov ntawm qhov kub qis dua, tsis tsim cov foci hauv zos. Lawv qhov ntom ntom thaum lub sij hawm crystallization txo qis dua li thaum lub sij hawm hloov dej mus rau hauv dej khov, uas txhais tau hais tias lub ntim tsis nce ntau heev - txawm tias khov aqueous daws ntawm glycols tsis rhuav tshem cov kav dej.
Feem ntau, cov neeg siv khoom xaiv propylene glycol vim nws tsis muaj tshuaj lom. Qhov tseeb, nws yog ib qho kev pom zoo cov khoom noj ntxiv E1520, uas yog siv rau hauv cov khoom ci thiab lwm yam khoom noj ua tus neeg saib xyuas cov dej noo. Nws yog siv rau hauv tshuaj pleev ib ce thiab ntau lwm yam. Yog tias lub kaw lus tau ntim nrog cov tshuaj aqueous ntawm propylene glycol, tsis tas yuav tsum muaj kev ceev faj tshwj xeeb; tus neeg siv khoom tsuas yog xav tau ib lub pas dej ntxiv los them nyiaj rau cov xau. Nws yog qhov nyuaj dua rau kev ua haujlwm nrog ethylene glycol - cov khoom no yog cais raws li cov tshuaj lom neeg tsawg (chaw txaus ntshai peb). Nws qhov siab tshaj plaws tso cai nyob rau hauv cov huab cua yog 5 mg / m3, tab sis vim nws tsis tshua muaj volatility ntawm qhov kub thiab txias, cov vapors ntawm no polyhydric cawv tuaj yeem ua rau lom yog tias koj ua pa ntev.
Qhov xwm txheej phem tshaj plaws yog nrog cov dej khib nyiab: dej thiab propylene glycol tsis tas yuav muab pov tseg, tab sis qhov concentration ntawm ethylene glycol hauv cov chaw siv dej pej xeem yuav tsum tsis pub tshaj 1 mg / l. Vim li no, cov tswv tsev cov ntaub ntawv yuav tsum suav nrog hauv kev kwv yees tshwj xeeb cov kua dej, cov thawv ntim khoom thiab / lossis cov txheej txheem rau diluting cov dej txias nrog dej: koj tsis tuaj yeem yaug nws hauv qhov ntws. Qhov ntim ntawm cov dej rau dilution yog ntau pua lub sij hawm ntau dua li qhov ntim ntawm cov coolant, thiab spilling rau hauv av los yog hauv pem teb yog tsis tshua muaj siab - tshuaj lom polyhydric cawv yuav tsum tau ntxuav tawm nrog ntau cov dej. Txawm li cas los xij, kev siv ethylene glycol hauv cov tshuab cua txias niaj hnub rau cov chaw zov me nyuam kuj tseem muaj kev nyab xeeb heev yog tias txhua qhov tsim nyog tau ceev faj.
Cov Economy
Cov dej tuaj yeem suav hais tias tsis pub dawb piv rau tus nqi ntawm cov dej txias raws li cov dej cawv polyhydric. Ib qho aqueous tov ntawm propylene glycol rau lub chiller-kiv cua coil system yog kim heev - nws raug nqi txog 80 rubles ib liter. Noj mus rau hauv tus account qhov xav tau los hloov lub coolant ib ntus, qhov no yuav ua rau muaj txiaj ntsig zoo. Tus nqi ntawm cov tshuaj aqueous ntawm ethylene glycol yog yuav luag ib nrab ntawm ntau npaum li cas, tab sis nws tseem yuav tsum tau muab tso rau hauv kev kwv yees rau cov nqi pov tseg, uas, txawm li cas los xij, kuj tseem me me. Muaj cov nuances ntsig txog viscosity thiab tshav kub muaj peev xwm: propylene glycol-raws li coolant yuav tsum muaj siab dua generated los ntawm cov twj tso kua mis. Feem ntau, tus nqi ntawm kev khiav hauj lwm lub cev nrog ethylene glycol yog qhov qis dua, yog li qhov kev xaiv no feem ntau xaiv, txawm tias qee qhov toxicity ntawm lub coolant. Lwm qhov kev xaiv rau kev txo cov nqi yog kev siv ob-circuit system nrog lub tshav kub exchanger, thaum cov dej zoo tib yam circulates nyob rau hauv cov chav nrog ib tug zoo kub, thiab ib tug uas tsis yog-freezing glycol tov hloov tshav kub sab nraum. Kev ua tau zoo ntawm cov txheej txheem zoo li no yog qis dua, tab sis qhov ntim ntawm cov coolant kim kim tau txo qis.
Cov txiaj ntsim tau los
Qhov tseeb, tag nrho cov kev xaiv tau teev tseg rau cov tshuab cua txias (tshwj tsis yog cov dej ntshiab, uas tsis tuaj yeem ua tsis tau hauv peb lub latitudes) muaj txoj cai muaj. Qhov kev xaiv yog nyob ntawm tag nrho cov nqi ntawm cov tswv cuab, uas yuav tsum tau muab xam rau hauv txhua qhov tshwj xeeb uas twb muaj lawm nyob rau theem tsim. Tib yam uas koj yuav tsum tsis txhob ua yog hloov lub tswvyim thaum qhov project yuav luag npaj txhij. Ntxiv mus, nws yog tsis yooj yim sua kom hloov lub coolant thaum lub installation ntawm engineering systems ntawm lub neej yav tom ntej cov ntaub ntawv chaw twb tab tom ua. Kev pov thiab tsim txom yuav ua rau muaj kev siv nyiaj loj, yog li koj yuav tsum txiav txim siab xaiv ib zaug thiab rau tag nrho.
Tau qhov twg los: www.hab.com