Muab xam los ntawm lub tshav kub exchanger: tus piv txwv. Muab xam los ntawm lub cheeb tsam, lub hwj chim ntawm lub tshav kub exchanger

Muab xam los ntawm lub tshav kub exchanger tam sim no yuav siv sij hawm tsawg tshaj li tsib feeb. Tej lub koom haum uas ua thiab muag xws khoom feem ntau muab txhua leej txhua tus lawv tus kheej recruitment kev pab cuam. Nws yuav tsum downloaded dawb xwb los ntawm lub tuam txhab website los yog lawv ti teg taw yuav tuaj rau koj chaw ua hauj lwm thiab nruab nws dawb. Txawm li cas los, raws li ib tug ntawm xws li suav yog muaj tseeb, peb tso siab tau rau nws thiab tsis tau ntse yog hais tias tus chaw tsim tshuaj paus ntawm sib ntaus sib tua nyob rau hauv cov kev sib tw nrog nws sib tw? Xyuas hluav taws xob lub tshuab xam zauv yuav tsum tau paub txog los yog tsawg kawg yog tus to taub kev niaj hnub ntawm xam ntawm tshav kub exchangers. Wb sim txheeb tawm cov lus.

Yuav ua li cas yog ib tug kub exchanger

Ua ntej ua tau zoo muab xam rau ntawm lub tshav kub exchanger, cia peb nco ntsoov, thiab zoo li cas xws li ib tug ntaus ntawv? Teplomassoobmennyh apparatus (aka tshav kub exchanger, kuj hu ua tshav kub pauv apparatus los yog TOA) - ib tug ntaus ntawv rau hloov lwm lub tsev ntawm tshav kub los ntawm ib tug coolant mus rau lwm lub. Nyob rau hauv tus txheej txheem hauv lub kub coolant hloov kuj hloov lawv ceev thiab, raws li, loj indices tshuaj. Uas yog vim li cas xws dab raug xa mus rau raws li thaum tshav kub kub thiab huab hwm coj mus.

hom ntawm tshav kub hloov lwm lub tsev

Tam sim no cia tus tham txog lub tshav kub hloov hom - muaj tsuas yog peb. Tawg - hloov ntawm tshav kub los tawg. Raws li ib qho piv txwv, peb yuav nco qab lub sunbathing rau lub puam nyob rau hauv ib tug sov so caij ntuj sov hnub. Thiab txawm cov tshav kub exchangers yuav muaj nyob rau hauv kev ua lag luam (raj cua tso cua sov). Txawm li cas los, feem ntau rau lub tsev cua kub, chav nyob rau hauv lub chav tsev peb yuav roj los yog hluav taws xob cua sov. Qhov no yog ib qho piv txwv ntawm lwm yam Thaum tshav kub kub hloov lwm lub tsev - convection. Convection yog tej yam ntuj tso, tsis (extract, thiab nyob rau hauv lub thawv yuav tsum Exchanger) los yog nrog cov neeg kho tshuab tsav (nrog ib tug kiv cua, piv txwv li). Cov yav tas hom yog npaum li cas zoo dua.

Txawm li cas los, qhov zoo tshaj txoj kev tshav kub hloov lwm lub tsev - yog lub thermal conductivity, los yog, raws li nws yog hu ua, conduction (conduction ntawm lus Askiv -. "Conductivity"). Tej engineer uas yuav tuav lub thermal tsim ntawm lub tshav kub exchanger, ua ntej ntawm tag nrho cov xav txog yuav ua li cas los xaiv npaum cov khoom nyob rau hauv ib tug tsawg kawg nkaus ntawm qhov chaw. Thiab nws tswj kom tau qhov no yog los ntawm conduction. Ib qho piv txwv ntawm no yog qhov zoo tshaj rau hnub tim TOA - phaj kub exchangers. Phaj TOA los ntawm txhais - lub tshav kub exchanger uas hloov thaum tshav kub kub ntawm lub coolant mus rau lwm ib los ntawm ib tug phab ntsa cais lawv. Qhov siab tshaj plaws tau hu rau cheeb tsam nruab nrab ntawm ob mediums ua ke nrog yeej muaj tseeb xaiv cov ntaub ntawv, thiab lawv profile daim hlau thickness ntev xaiv kom txo tau kho vajtse thaum khaws cia tus thawj kev yam ntxwv yuav tsum tau nyob rau hauv tus txheej txheem.

hom ntawm tshav kub exchangers

Ua ntej koj yuav nqa tawm muab xam rau ntawm lub tshav kub exchanger yog txiav txim los ntawm nws hom. Tag nrho cov TOA yuav tau muab faib ua ob yam loj pawg: recuperative thiab regenerative tshav kub exchangers. Lub ntsiab sib txawv therebetween yog raws li nram no: nyob rau hauv lub TOA recuperative tshav kub pauv yuav siv sij hawm qhov chaw los ntawm cov phab ntsa ntawm ob lub thaum tshav kub kub nruab nrab, thiab tuaj nyob rau hauv kev sib cuag nrog txhua lwm yam nyob rau hauv ob regenerative xov xwm, feem ntau yuav tau tom ntej nws thiab sib cais nyob rau hauv tshwj xeeb separators. Regenerative tshav kub exchangers raug muab faib mus rau hauv tshav kub exchangers thiab nws nrog ib tug nozzle (nyob ruaj ruaj teeb meem los yog intermediate). Roughly hais lus, ib lub thoob ntawm dej kub, muab nyob rau hauv lub txias, los yog ib khob ntawm kub tshuaj yej, muab txias nyob rau hauv lub tub yees (yeej tsis tsis ua li cas!) - qhov no yog ib qho piv txwv txog tej mixing TOA. Ib tug pouring tshuaj yej saucer thiab cua txias rau nws ces peb tau txais ib qho piv txwv ntawm ib tug regenerative tshav kub exchanger nrog lub nozzle (saucer, nyob rau hauv qhov kev piv txwv plays lub nozzle ib feem), uas yog thawj hu nrog lub ambient cua thiab yuav siv sij hawm nws kub, thiab ces xaiv rau ib feem ntawm lub tshav kub ntawm poured mus rau hauv nws ntawm kub tshuaj yej nrhiav ob xov xwm ua rau thermal equilibrium hom. Txawm li cas los, raws li peb twb pom ntau npaum kev siv ntawm lub thermal conductivity mus rau cov hloov thaum tshav kub kub los ntawm ib tug nruab nrab mus rau lwm lub, yog li ntawd, pab tau ntau nyob rau hauv cov nqe lus ntawm tshav kub hloov lwm lub tsev (thiab dav siv) TOA hnub no - ntawm chav kawm, recuperative.

Thermal thiab yam ntxwv xam

Tej muab xam los ntawm cov regenerative tshav kub exchanger yuav ua raws li nyob rau hauv cov kev tshwm sim ntawm lub cua sov, hydraulic thiab lub dag lub zog suav. Lawv yog cov yuav tsum muaj, indispensable rau tus tsim ntawm tshiab cov khoom thiab tej hom kev yog lub hauv paus rau xam lub tom ntej ua qauv rau tib yam ntawm pab kiag li lawm kab. Lub ntsiab hauj lwm ntawm lub thermal TOA muab xam yog los mus txiav txim qhov yuav tsum tau kub pauv deg hauv cheeb tsam rau ruaj khov lag luam los ntawm lub tshav kub exchanger thiab tswj qhov yuav tsum tau tsis muaj kev tshaj tawm qhov hluav taws xob. Heev feem ntau nyob rau hauv xws suav engineers yuav muab arbitrary qhov tseem ceeb ntawm qhov ceeb thawj thiab loj cov yam ntxwv ntawm yav tom ntej cov khoom (ntaub ntawv, txoj kab uas hla hlab, daim hlau, qhov ntev, beam geometry, hom thiab cov ntaub ntawv finning li al.), Txawm li cas los tom qab thaum tshav kub kub yog feem ntau ua constructive xam exchanger. Tom qab tag nrho, yog hais tias tus thawj kauj ruam engineer xam tau tias yog tsim nyog deg hauv cheeb tsam rau ib tug muab txoj kab uas hla cov yeeb nkab, piv txwv li, 60 mm, thiab qhov ntev ntawm lub tshav kub exchanger li muab txog caum meters, nws yog ib zajlus kom xav tias txoj kev hloov multistage tshav kub exchanger los yog mus rau lub raj nras hom, los yog ua rau kom cov kab uas hla ntawm cov hlab.

hydraulic xam

Hydraulic los yog hydro-mechanical thiab aerodynamic suav ua rau paub thiab optimize hydraulic (aerodynamic) siab tsis nyob rau hauv lub tshav kub exchanger, thiab los mus laij lub zog noj mus kov yeej lawv. Muab xam los ntawm tej kev, channel los yog cov yeeb nkab rau cov cua kub nruab nrab zaj confronts tib neeg thawj ua hauj lwm - mus ua ntu lub tshav kub pauv txheej txheem ntawm qhov chaw. Hais tias yog, nruab nrab yuav tsum xeem dhau, thiab lwm yam yog kom tau ntau li ntau kub nyob rau ib yam tsawg kawg nkaus luv ntawm nws cov hoob kawm. Qhov no feem ntau thov ntxiv thaum tshav kub kub pauv nto nyob rau hauv daim ntawv ntawm cov tis ntses chaw tsim (rau kev sib cais ntawm tus ciam laminar sublayer thiab txhim khu txaus kiv). Pom tshuav nyiaj li cas kev sib raug zoo nyob rau hauv hydraulic losses, cov cheeb tsam ntawm lub tshav kub pauv nto, qhov nyhav thiab qhov luaj li cas cov yam ntxwv, thiab lub rho tshav kub tso zis yog lub txiaj ntsim ntawm tus sau ua ib pawg thermal, hydraulic thiab constructive TOA xam.

xyuas xam

Verification ntawm lub tshav kub exchanger yog nqa tawm nyob rau hauv lub rooj plaub uas nws yog tsim nyog los nteg ib lub hwj chim cia ntawm tej tshav kub pauv deg hauv cheeb tsam. Lub nto ntawm lub zeem cia rau txawv yog vim li cas thiab nyob rau hauv tej yam, yog li ntawd, yuav tsum tau los ntawm cov nqe lus uas siv, Yog hais tias lub khw tsim hom txiav txim siab mus ua ib tug ntxiv ntug yuav tsum tau raws nraim nco ntsoov hais tias qhov no cua sov yuav tsum tau tso tawm nyob rau hauv tsoom fwv, thiab kom txo tau uas tsis nyob rau hauv suav. Nyob rau hauv tej rooj plaub, reservations yuav tsum rau pub muab kwv yees ntxwv ntev tau nyob rau hauv lwm yam (evaporators, economizers) nyob rau hauv lub xam ntawm lub peev xwm ntawm lub tshav kub exchanger yog qhia tshwj xeeb uas ua tswvcuab paj tau paj nto rau lub compressor roj paug tam sim no nyob rau hauv lub tub yees Circuit Court. Yog, thiab neeg pluag zoo dej yuav tsum tau coj mus rau hauv tus account. Tom qab ib pliag, du lag luam los ntawm tshav kub exchangers, tshwj xeeb tshaj yog nyob rau high school kub, lub scum settles rau ntawm qhov chaw ntawm lub tshav kub pauv apparatus, txo lub tshav kub hloov lwm lub tsev coefficient, thiab inevitably ua rau ib tug txo nyob rau hauv cab tshav kub takeoff. Yog li ntawd competent engineer, ib tug muab xam los ntawm lub tshav kub exchanger "dej-dej", them tshwj xeeb mloog mus ntxiv cia ntawm tshav kub pauv nto. Xyuas xam thiab siv nyob rau hauv thiaj li yuav saib yuav ua li cas cov khoom xaiv yuav ua hauj lwm rau lwm yam, theem nrab hom. Piv txwv li, nyob rau hauv lub central cua txias (cua-mov sib) tso cua sov rau thawj thiab thib ob cua kub siv nyob rau hauv lub txias rau lub caij, thiab feem ntau koom nrog lub caij ntuj sov rau cov cua txias mov cua noj dej txias rau hauv cov huab cua kub exchanger raj. Yuav ua li cas yuav lawv ua li cas thiab yuav muab cov ciaj ciam mus rau soj ntsuam lub luv xam.

kev tshawb fawb kev kwv yees

Kev tshawb fawb TOA suav nqa tawm nyob rau hauv lub hauv paus ntawm qhov kev tshwm sim ntawm lub thermal xam thiab pov thawj. Lawv yog cov tsim nyog, raws li ib tug txoj cai, los mus ua kom qhov tseeb hloov rau cov qauv ntawm cov tsim ntaus ntawv. Lawv kuj ua rau kho tej sib npaug yog pw nyob rau hauv lub xam qauv siv TOA tau empirically (rau cov ntaub ntawv). Ua kev tshawb fawb yuav ib tug xam ntawm kaum tawm thiab tej zaum pua pua ntawm suav los ntawm ib tug tshwj xeeb lub hom phiaj, tsim thiab siv nyob rau hauv qhuav raws li cov zauv hom phiaj ntawm tsim ntawm thwmsim. Raws li kev soj ntsuam qhia tus ntawm txawv tej yam kev mob thiab lub cev ntau rau kawm ntawv TOA.

lwm suav

Lub xam ntawm lub tshav kub exchanger cheeb tsam, tsis txhob hnov qab txog tus kuj cov ntaub ntawv. Zog suav TOA muaj xws li xyuas lub pob unit rau voltage, torsional Symptoms rau lub siab tshaj plaws pub ua hauj lwm lub sij hawm rau kev nthuav dav thiab lub pob hlav ntawm lub neej yav tom ntej ntawm lub tshav kub exchanger. Nrog tsawg heev qhov ntev ntawm cov khoom yuav tsum tau muaj zog, ruaj khov thiab kom muaj kev ruaj ntseg lag luam nyob rau hauv ntau yam, txawm lub feem ntau khiav tej yam kev mob.

Dynamic xam yog ua los mus txiav txim ntau yam yam ntxwv ntawm tshav kub exchanger rau nce mus nce los lag luam hom.

Hom ntawm tshav kub exchanger tsim

Recuperative TOA nyob rau hauv tsim tau muab faib mus rau hauv ib tug txaus loj tus naj npawb ntawm cov pab pawg. Qhov tseem paub thiab dav siv - ib tug phaj kub exchanger, huab cua (Finned raj), plhaub thiab lub raj kub exchangers "yeeb nkab nyob rau hauv cov yeeb nkab", plhaub-thiab-phaj, thiab lwm tus neeg. Muaj ntau ntau heev tshwj xeeb thiab kab txawv hom, e.g., kauv (cochlea-exchanger) los yog lub scraper, uas ua hauj lwm nrog khov los yog uas tsis yog-Newtonian kua, thiab ntau lwm yam.

Thaum tshav kub kub exchanger "raj nyob rau hauv lub raj"

Xav txog qhov nyuaj xam ntawm lub tshav kub exchanger "raj nyob rau hauv lub raj". Structurally, hom TOA yog maximally yooj yim zog. Thaum lub sij hawm pib mus rau hauv lub plab yas apparatus, feem ntau yog kub kub hloov kua txo losses, thiab mus rau hauv lub tsev nyob los yog mus rau hauv lub txheej raj, lub coolant txias mus dhia. Engineer ua hauj lwm nyob rau hauv cov ntaub ntawv no thiaj li mus rau lub kev txiav txim ntawm qhov ntev ntawm lub tshav kub exchanger rau lub hauv paus ntawm lub xam thaum tshav kub kub pauv deg hauv cheeb tsam thiab predetermined diameters.

Nws yog ib nqi ntxiv hais tias nyob rau hauv thermodynamics qhia lub tswvyim ntawm ib qho zoo tagnrho Thaum tshav kub kub exchanger, uas yog ntawm infinite ntev unit, qhov twg coolants ua hauj lwm nyob rau hauv txee, thiab ntawm tag nrho txhais kub sib txawv. Tus tsim "cov yeeb nkab nyob rau hauv cov yeeb nkab" ze raws li cov uas yuav tsum tau. Thiab yog hais tias khiav countercurrent tshav kub hloov lwm lub tsev kua, nws yuav tsum yog tus thiaj li hu ua "counter-tiag tiag" (li opposed rau tus ntoo khaub lig-raws li nyob rau hauv phaj TOA). Kub siab feem ntau zoo txhais tias thaum ib tug tsheb lub koom haum. Txawm li cas los, ua ib tug "yeeb nkab nyob rau hauv cov yeeb nkab" muab xam los ntawm lub tshav kub exchanger yuav tsum muaj tiag thiab tsis tau hnov qab txog lub logistics tivthaiv, raws li zoo raws li lub yooj yim ntawm installation. evrofury ntev - 13,5 m, thiab tsis yog tag nrho cov kev chaw nruj heev heev rau skid thiab installation ntawm cov khoom xws ntev.

Plhaub thiab cov raj kub exchangers

Yog li ntawd, nws yog ib feem ntawm lub xam ntawm xws li ib tug ntaus ntawv ntseeg nkaws ntws mus rau hauv lub xam ntawm plhaub thiab lub raj kub exchanger. Qhov no apparatus, nyob rau hauv lub raj nras yog nyob rau hauv ib rooj plaub (casing), ntxuav los ntawm txawv coolants, nyob ntawm seb cov lo lus uas khoom. Nyob rau hauv capacitors, piv txwv li, khiav nyob rau hauv lub refrigerant tsho, thiab dej - nyob rau hauv ib tug raj. Nrog no txoj kev ntawm tsheb kawm yooj yim dua thiab ntau npaum tswj lub lag luam ntawm lub tsev. Nyob rau hauv lub evaporators, conversely, cov refrigerant boils nyob rau hauv tus menyuam thiab lawv ntxuav nrog txias kua (dej, brines, glycols, etc.). Yog li ntawd, lub xam-raj kub exchanger yog txo kom txo tau cov khoom me me. Ua si nrog cov kab uas hla ntawm lub casing, lub lub cheeb thiab tus naj npawb thiab ntev ntawm lub puab kav apparatus engineer nkag mus rau hauv los laij tus nqi ntawm tshav kub pauv deg hauv cheeb tsam.

huab cua kub exchangers

Ib qho ntawm feem ntau yog nyob deb tshav kub exchangers - ib tug finned raj kub exchangers. Lawv yog cov hu ua coils. Qhov uas lawv yuav tsis tau tsuas yog tom ib ncua los ntawm fancoils (los ntawm cov lus Askiv. Ntxuam + kauj, i.e., "kiv cua" + "kauj") nyob rau hauv sab hauv blocks phua tshuab los giant flue roj recuperator (xaiv los ntawm tshav kub ntawm lub kub flue roj thiab hloov lwm lub tsev nws rau cua sov) nyob rau hauv boilers ntawm CHP. Uas yog vim li cas lub xam ntawm lub kauj exchanger nyob rau hauv daim ntawv thov, nyob qhov twg lub tshav kub mus rau hauv lub lag luam. Muaj cua txivhmab (VOPy) ntsia tau rau hauv lub lag poob siab-khov nqaij, nyob rau hauv yees khov nab kuab thaum uas tsis muaj kub thiab lwm yam khoom ntawm cov zaub mov txias, yuav tsum tau tej yam ntxwv nta nyob rau hauv lawv tsim. Kev ncua deb ntawm lamella (fin) yuav tsum tau maximized yuav ua tau kom lub sij hawm ntawm lub lag luam nruam ntawm defrost mus. Vaporizers rau DCS (cov ntaub ntawv center), on qhov tsis tooj, yuav ua rau tau ib tug ntau compact clamping mezhlamelnye deb mus rau ib tug tsawg kawg nkaus. Tej thaum tshav kub kub exchangers yog kev khiav hauj lwm nyob rau hauv lub "dawb huv cheeb tsam", surrounded los ntawm ib tug zoo lim (mus txog HepA qib), txawm li cas los, qhov no xam yog nqa tawm ntawm lub tubular tshav kub exchanger nrog tus haum rau nrhiav zuag qhia tag nrho dimensions.

phaj kub exchangers

Tam sim no ruaj khov kev thov rau phaj kub exchangers. Raws li nws cov kev tsim, lawv yog tag nrho gasketed thiab semi-welded, thiab mednopayanymi nikelpayanymi, welded thiab brazed diffusion qauv (tsis muaj solder). Thermal tsim ntawm lub phaj kub exchanger yog sufficiently saj zawg zog thiab tsis yog tshwj xeeb tsis yooj yim rau engineer. Cov kev xaiv yuav ua si hom phiaj, sib sib zog nqus raws txoj kev, tis ntses hom, steel thickness, ntaub ntawv sib txawv thiab, feem ntau cov tseem ceeb - ntau standard loj qauv ntawm pab kiag li lawm ntawm txawv ntau thiab tsawg. Tej thaum tshav kub kub exchangers muaj tsawg tsawg thiab ntau (rau cov chav cua kub ntawm cov dej) los yog siab thiab nqaim (sib cais thaum tshav kub kub exchangers cua txias). Lawv feem ntau siv, thiab ib tug nruab nrab nrog rau ib theem kev hloov mus, piv txwv li raws li condensers, evaporators, chav txivhmab, predkondensatorov thiab thiaj li nyob. D. Ua thermal tsim ntawm tshav kub exchanger khiav hauj lwm rau ib tug biphasic txawv, ib tug me ntsis nyuab me ntsis dua lub tshav kub exchanger ntawm lub "kua-kua", tab sis rau tej engineer qhov teeb meem no yog solvable thiab tsis yog tshwj xeeb yog nyuaj. Yuav kom pab txhawb cov suav niaj hnub engineering designers siv computer database, qhov twg koj yuav nrhiav tau ib tug ntau ntawm ntaub ntawv tsim nyog, nrog rau cov theem daim duab ntawm tej refrigerant nyob rau hauv tej streak hom, piv txwv li, ib qho kev pab CoolPack.

Muab xam los Piv txwv li exchanger

Lub hom phiaj tseem ceeb ntawm lub xam yog ib tug muab xam los ntawm cov kev tsim nyog thaum tshav kub kub pauv deg hauv cheeb tsam. Thaum tshav kub kub (tub yees) hwj chim feem ntau yog teev nyob rau hauv cov nqe lus ntawm reference, tab sis nyob rau hauv peb tus yam ntxwv peb yuav xam thiab nws, rau, hais tias, ib daim tshev ntawm lub yuav tsum specification. Tej zaum nws kuj tshwm sim hais tias cov ntaub ntawv yeej muaj peev xwm nkag yuam kev. Ib tug ntawm cov kev pab raws qib ntawm ib tug competent engineer - qhov no yuam kev los nrhiav thiab txhim kho. Raws li ib qho piv txwv, ua xam phaj thaum tshav kub kub exchanger ntawm lub "kua - kua". Cia nws ua tau ib separator Circuit Court (siab breaker) nyob rau hauv high-sawv lub tsev. Nyob rau hauv thiaj li yuav daws qhov siab nyob rau hauv cov khoom, cov kev siv ntawm skyscrapers heev feem ntau siv no mus kom ze. Nyob rau ib sab ntawm lub tshav kub exchanger muaj dej nyob rau kev nkag Tvh1 = 14 ᵒS thiab tawm Tvyh1 = 9 ᵒS, thiab ib tus nqi ndlwg G1 = 14 500 kg / h, thiab nyob rau lwm yam - yog tseem dej, tiam sis ntawm no nrog rau cov nram qab no tsis: Tvh2 = 8 ᵒS, Tvyh2 ᵒS = 12, G2 = 18 125 kg / h.

Tsim nyog hwj chim (Q0) xam cov thermal tshuav mis (saib daim duab saum toj no, cov mis 7.1 ..), nyob qhov twg Cp - kev thermal peev xwm (rooj tus nqi). Rau simplicity ntawm suav Cov qhov tseem ceeb coj lub tshav kub muaj peev xwm EOT = 4,187 [kJ / kg * ᵒS]. Peb xav txog:

Q1 = 14 500 * (14 - 9) * 4,187 = 303557,5 [kJ / h] = W = 84,3 84321,53 kW - nyob rau hauv thawj sab thiab

Q2 = 18 125 * (12 - 8) * 4,187 = 303557,5 [kJ / h] = W = 84,3 84321,53 kW - rau lub thib ob sab.

Nco ntsoov tias, raws li mis (7.1), Q0 = Q1 = Q2, hais txog ntawm uas sab ntawm lub xam nqa tawm.

Ntxiv mus, nyob rau hauv lub ntsiab thaum tshav kub kub hloov lwm lub tsev kab zauv (7.2), peb yuav nrhiav tau cov kev tsim nyog deg hauv cheeb tsam (7.2.1), qhov chaw uas k - Thaum tshav kub kub hloov lwm lub tsev coefficient (assumed sib npaug zos rau 6350 [W / ^m2]), thiab ΔTsr.log. - txhais li cas-kub sib txawv, yog muab xam los ntawm cov mis mos (7.3):

? T sr.log. = (2 - 1) / haujlwm uas yog COy (2/1) = 1 / ln2 = 1 / 0.6931 = 1.4428;

F yog = 84321/6350 * 1.4428 = 9.2 m ^2.

Nyob rau hauv lub rooj plaub uas lub tshav kub hloov lwm lub tsev coefficient yog tsis paub hais tias, lub xam yog ib nyuag nyuab dua phaj kub exchanger. Formula (7.4) yog xam tau tias yog Reynolds tooj uas ρ - ceev [kg / ^m3], η - dynamic viscosity, [N * s / m ^2], v - tshaj tawm los ntawm qhov nruab nrab nyob rau hauv lub duct [m / s], d cm - wettable bore txoj kab uas hla [m].

Los ntawm lub rooj rau peb nrhiav cov yuav tsum tau tus nqi Prandtl [Pr], thiab cov mis (7.5), peb muab tau cov Nusselt tooj, qhov chaw uas n = 0,4 - ib tug ua kua cua kub tej yam kev mob, thiab n = 0,3 - txias nyob rau hauv cov kua tej yam kev mob.

Ntxiv mus, cov mis (7.6) yog xam thaum tshav kub kub hloov lwm lub tsev coefficient ntawm lub coolant mus rau txhua phab ntsa, thiab cov mis (7.7) yog lam xav thaum tshav kub kub hloov lwm lub tsev coefficient, uas yog pawg nyob rau hauv cov mis (7.2.1) los mus laij lub tshav kub pauv deg hauv cheeb tsam.

Nyob rau hauv lub saum toj no cov qauv, λ - thermal conduction coefficient, ϭ - lub thickness ntawm cov channel phab ntsa, α1 thiab α2 - Thaum tshav kub kub hloov lwm lub tsev coefficients ntawm txhua tus ntawm lub tshav kub hloov lwm lub tsev phab ntsa.