Yog vim li cas tooj liab yog Default Refrigerant Circuit Court khoom
Lub tshuab cua txias txav cua sov ntau dua li tsim nws, thiab cov tub yees yuav tsum nqus cua sov hauv cov evaporator thiab tsis kam lees nws hauv lub condenser. Cov tubing uas nqa cov tub yees nyob nruab nrab ntawm cov chav tsev sab hauv thiab sab nraum zoov yog li ntawd ib feem ntawm cov cua kub hloov chaw, tsis yog cov yeeb nkab xwb. Cov tooj liab raug xaiv vim nws ua plaub txoj haujlwm ib zaug: nws ua kom sov tau zoo, nws tuav lub zog siab nrog cov phab ntsa nyias, nws tuaj yeem khoov, flared thiab brazed ntawm qhov chaw tsis muaj cov cuab yeej tshwj xeeb, thiab nws muaj sia nyob ntau xyoo ntawm kev ntub dej thiab qhuav ncig sab nraum zoov. Aluminium tuaj yeem hloov pauv hauv qee lub luag haujlwm, tab sis tsis tshua muaj nyob hauv txhua tus tib lub sijhawm.
Thermal thiab Mechanical Performance
Qhov kev ua tau zoo sib txawv ntawm tooj liab thiab txhuas yog qhov zoo tshaj plaws pom ntawm ib sab. tooj liab ua cua sov ntawm kwv yees li 390 mus rau 400 W ib meter kelvin nyob rau hauv cov qib raj siv rau tub yees, thaum txhuas nyob ze ntawm 205 mus rau 237 W ib meter kelvin. tooj liab kuj yog ntau tshaj peb zaug denser, uas tseem ceeb rau qhov hnyav tab sis tsis yog rau kev ua tau zoo, thiab nws muaj qis dua coefficient ntawm thermal expansion, yog li lub brazed sib koom tsis tshua muaj kev ntxhov siab los ntawm qhov kub thiab txias.
| Khoom | Copper tube, C12200 | Aluminium raj |
|---|---|---|
| Thermal conductivity | txog 390 mus rau 400 W ib meter kelvin | txog 205 rau 237 W ib meter kelvin |
| Qhov ntom | 8,94g 3 | 2.70 g / cm3 |
| Koom nrog | Brazing thiab flaring nrog standard torches | Flux brazing lossis mechanical pob qij txha |
| Kev kho teb | Txiav, re-flare los yog re-braze | Txwv, feem ntau hloov ua ib chav tsev |
| Galvanic cwj pwm nrog aluminium fins | Noble hlau, xav tau kev sib cais | Compatible nrog aluminium fins |
Mechanically, annealed tooj liab raj ua ke siab tawg lub zog nrog txaus ductility yuav tsum tau coiled thiab khoov ib ncig ntawm nruj radii, thiab nws ua hauj lwm hardens xwb me me nyob rau hauv kev pab cuam. Aluminium raj ntawm tib txoj kab uas hla sab nraud xav tau phab ntsa tuab kom ncav cuag qhov sib piv siab, thiab nws tsis tshua muaj siab ntev ntawm kev rov kho dua thiab kev co. Tias yog vim li cas tooj liab tseem yog tus qauv rau cov kab sib txuas ntawm sab hauv tsev thiab sab nraum zoov, qhov twg lub raj yog khoov rau ntawm qhov chaw thiab tom qab ntawd muab faus rau hauv qab phab ntsa lossis khiav hla lub ru tsev.
Qib thiab cov qauv rau tube tub yees
Lub tshuab cua txias tubing yog tsim los ntawm phosphorus -deoxidised tooj liab, xaiv C12200 lossis Cu-DHP, nrog cov ntsiab lus tooj liab tsawg kawg yog 99.9 feem pua thiab phosphorus nyob rau hauv thaj tsam li ntawm 0.015 txog 0.04 feem pua. Cov phosphorus deoxidises cov yaj kom lub raj tuaj yeem ua rau hauv qhov chaw txo qis yam tsis muaj hydrogen embrittlement txaus ntshai uas cuam tshuam rau oxygen-cov kabmob tooj liab, thaum cov phosphorus seem tshuav nqi tsuas yog me ntsis conductivity, uas tsis tseem ceeb hauv lub raj uas muaj nuj nqis rau kev ua haujlwm thermal es tsis yog hluav taws xob conduction. Cov qauv khoom siv feem ntau hais txog yog ASTM B280 rau seamless tooj liab raj rau cua txias thiab tub yees, GB / T 17791 rau cov cua txias thiab cov khoom siv tub yees, thiab EN 12735 qhov chaw 1 thiab 2, uas npog puag ncig seamless tooj liab raj thiab cov kev ntsuas siab sib xws. Kev huv huv tau teev tseg zoo ib yam: cov bore yog ib txwm muab cov khoom qhuav thiab capped, nrog rau cov roj seem, cov dej noo thiab cov ntsiab lus ntawm cov khoom, vim tias cov pa paug tawm sab hauv lub raj nkag mus rau hauv cov cuab yeej nthuav dav thiab ua rau muaj kev cuam tshuam los yog capillary khov.
Phab ntsa Thickness, Temper thiab Refrigerant xaiv
Phab ntsa thickness tsis yog ib qho khoom ruaj khov ntawm txoj kab uas hla; nws ua raws los ntawm cov tub yees thiab lub zog siab. R410A khiav ntawm lub zog siab dua li R22 nws hloov, thiab R32 khiav dua, yog li tib txoj kab uas hla yuav xav tau phab ntsa tuab dua lossis muaj zog dua. Kev xaiv cov raj yuav tsum yog li ntawd yuav tsum tau lees paub tiv thaiv cov rooj ntsuas siab hauv cov qauv khoom siv thiab cov txheej txheem tsim siab, tsis yog xaiv los ntawm tus cwj pwm.
| Hom sab nraud txoj kab uas hla | Phab ntsa thickness ntau | Ib txwm npau taws | Hom dej num |
|---|---|---|---|
| 6.35mm ib | 0.6-0.8 hli | Mos annealed, O60 | Ceg thiab txuas cov kab |
| 9,52mm ua | 0.7-0.9 hli | Mos annealed, O60 | Main sab hauv tsev rau sab nraum zoov kev twb kev txuas |
| 12.7mm thiab siab dua | 0.8-1.0 hli | Mos los yog ib nrab nyuaj | Loj muaj peev xwm kab thiab headers |
Cov tshav kub hloov chaw feem ntau yog kho dua tshiab. Sab hauv -grooved raj, tsim los ntawm kos helical ridges rau hauv lub bore, tsa lub sab hauv tshav kub hloov coefficient los ntawm kev txhawb nucleate boiling thiab thinning cov kua zaj duab xis, yog li ib tug me me thiab sib zog kauj yuav ua tau tib lub luag hauj lwm. Grooved raj yog tus qauv rau sab hauv tsev thiab sab nraum zoov coil, thaum lub raj mos mos yog siv rau cov kab txuas ntev dua qhov twg khoov dominates thiab siab poob yog qhov tswj tau.
Corrosion thiab Field Reliability
Tooj liab tsis xeb, tab sis nws tsis muaj zog. Qhov feem ntau tsis ua hauj lwm hauv cov cua txias coils yog formicary corrosion, nyob rau hauv uas cov organic acids, feem ntau formic thiab acetic acid tso tawm los ntawm tej yam rwb thaiv tsev foams, adhesives, sealants thiab ntxuav cov khoom, tua cov tooj liab thiab tsim ntiav subsurface tunnels uas nws thiaj li perforate phab ntsa. Qhov kev tawm tsam tsis yooj yim pom kom txog thaum muaj qhov xau tshwm sim, yog li kev tiv thaiv yog qhov tsim thiab teeb tsa: khaws cov coils huv si thiab qhuav, zam cov ntaub ntawv rwb thaiv tsev uas tso cov organic acids ntawm qhov kub siab, thiab xyuas kom cov dej ntws tawm dawb. Kev teeb tsa ntawm ntug dej hiav txwv ntxiv cov tshuaj chloride- tsav tawm tsam thiab yuav tsum tau tswj kom ze zog ntawm kev sib cuag galvanic nrog txhuas fins. Tooj liab yog cathodic rau txhuas, yog li txhua tus choj ntub dej ntawm ob qho tib si tsim cov galvanic ob peb uas txi cov fin thiab tuaj yeem ua kom lub raj xa mus. Qhov sib txawv ntawm cov hlau sib txuas yuav tsum tau tawg los ntawm txheej, los ntawm lub tshuab ntxhua khaub ncaws los yog lub tes tsho, los yog los ntawm cov txheej txheem dej uas ua kom cov sib koom ua ke qhuav.
Copper Versus Aluminium Tubing
Aluminium microchannel condensers tau nce hauv av vim lawv txo qhov hnyav thiab tus nqi, thiab hauv qee lub khw lawv yog cov qauv rau sab nraum zoov coil. Kev lag luam - tawm yog tiag. Aluminium coil assemblies yog ib qho nyuaj rau kho, xav tau flux brazing los yog mechanical koom nrog, thiab tsis tuaj yeem tsuas yog re-flared ntawm qhov chaw, yog li qhov xau me me tuaj yeem txhais tau tias hloov qhov sib dhos ua tiav es tsis yog kho qhov sib koom ua ke. Aluminium kuj tseem muaj feem cuam tshuam rau galvanic nres thaum nws kov cov khoom siv tooj liab nyob rau lwm qhov hauv Circuit Court thiab rhiab heev rau kev co qaug zog. Cov tswv yim sib cais hauv kev ua lag luam yog li no meej: txhuas feem ntau siv hauv lub Hoobkas- ua cov coil sib dhos uas muaj cov txheej txheem tswj kev sib tsoo, thaum tooj liab tseem yog cov khoom ntawm kev xaiv rau lub tshav pob - cov kab refrigerant thiab rau cov ntawv thov uas muaj kev pabcuam thiab lub neej ntev ua tus tswj hwm qhov tshwj xeeb.
Cov lus nug nquag
Q: Vim li cas tooj liab zoo dua aluminium rau cua txias tubing?
Copper ua cua sov kwv yees li ob zaug ua tau zoo, ncav cuag lub siab tawg nrog lub phab ntsa nyias, tuaj yeem khoov, flared thiab brazed ntawm qhov chaw nrog cov cuab yeej zoo tib yam, thiab tuaj yeem kho tom qab xau. Aluminium yog sib dua thiab pheej yig dua tab sis nyuaj rau koom thiab kho.
Q: Dab tsi qib ntawm tooj liab siv rau tub yees?
Phosphorus -deoxidised tooj liab, C12200 los yog Cu-DHP, nrog cov ntsiab lus tooj liab tsawg kawg ntawm 99.9 feem pua thiab txog 0.015 txog 0.04 feem pua phosphorus. Nws tau muab rau cov qauv xws li ASTM B280, GB / T 17791 lossis EN 12735, qhuav thiab capped rau kev pabcuam tub yees.
Q: Puas yog lub tub yees puas cuam tshuam rau lub raj phab ntsa thickness?
Yog lawm. Cov tub yees txias siab dua xws li R410A thiab R32 yuav tsum muaj cov phab ntsa tuab dua lossis lub zog siab dua li R22 ntawm tib txoj kab uas hla. Ib txwm lees paub qhov kev xaiv tiv thaiv qhov ntsuas siab hauv cov qauv siv lub raj thiab cov qauv tsim siab ntawm qhov system.
Q: formicary corrosion yog dab tsi?
Nws yog subsurface tunneling nres tshwm sim los ntawm cov organic acids, feem ntau yog formic los yog acetic acid tso tawm los ntawm rwb thaiv tsev, adhesives los yog ntxuav cov neeg ua hauj. Nws perforates tooj liab coils los ntawm sab hauv tawm thiab tiv thaiv tsuas yog los ntawm kev xaiv cov khoom, kua thiab ua kom lub kauj kom qhuav thiab huv si.
Q: Puas yog sab hauv -grooved raj tsim nyog tus nqi ntxiv?
Rau kev siv coil, feem ntau yog. Lub helical ridges tsa lub tshav kub hloov pauv coefficient, yog li lub kauj me me thiab sib dua ua tiav tib lub luag haujlwm. Plain tube tseem nyiam rau cov kab txuas ntev uas khoov thiab siab poob dominate.
Q: Yuav ua li cas lub raj tooj liab yuav tsum khaws cia ua ntej kev teeb tsa?
Khaws lub kaus mom rau hauv qhov chaw, khaws cov coils hauv tsev thiab tawm hauv av, thiab tsis txhob sib cuag nrog cov hlau thiab nrog cov ntaub ntawv uas tso tawm cov organic acids. Cov dej noo, plua plav thiab roj tso rau hauv lub raj yog ib qho ua rau lub cev tsis ua haujlwm thaum ntxov.
