Li-dispensers tsa capillary li sebelisoa haholo-holo lits'ebetsong tsa malapeng le tse nyenyane tsa khoebo moo mocheso oa mocheso ho evaporator o batlang o sa fetohe.Lisebelisoa tsena li boetse li na le likhahla tse tlase tsa sehatsetsi 'me hangata li sebelisa li-compressor tsa hermetic.Baetsi ba sebelisa li-capillaries ka lebaka la bonolo ba tsona le theko e tlaase.Ho phaella moo, litsamaiso tse ngata tse sebelisang li-capillaries e le sesebelisoa sa tekanyo ha li hloke moamoheli oa lehlakore le phahameng, ho fokotsa litšenyehelo.
Li-tubes tsa capillary ha se letho ho feta li-tubes tse telele tsa bophara bo nyane le bolelele bo tsitsitseng bo kentsoeng pakeng tsa condenser le evaporator.Ha e le hantle, capillary e lekanya sehatsetsi ho tloha ho condenser ho ea ho mouoane.Ka lebaka la bolelele bo boholo le bophara bo bonyenyane, ha sehatsetsi se phalla ho eona, ho ferekana ha metsi le ho theoha ha khatello ho etsahala.Ha e le hantle, ha metsi a subcooled a phalla ho tloha tlase ho condenser ho pholletsa le li-capillaries, mokelikeli o mong o ka 'na oa bela ha o ntse o e-na le marotholi ana a khatello.Marotholi ana a khatello a tlisa mokelikeli o ka tlas'a khatello ea saturation mocheso oa oona lintlheng tse 'maloa haufi le capillary.Ho panya hona ho bakoa ke ho atoloha ha mokelikeli ha khatello e theoha.
Boholo ba khanya ea metsi (haeba e le teng) e tla itšetleha ka tekanyo ea supercooling ea mokelikeli ho tloha condenser le capillary ka boeona.Haeba ho khanya ha mokelikeli ho etsahala, ke ntho e lakatsehang hore lebone le be haufi le mouoane ka hohle kamoo ho ka khonehang ho netefatsa ts'ebetso e ntle ea sistimi.Ha mokelikeli o batang o tsoang botebong ba condenser, mokelikeli o fokolang o kenella ka har'a capillary.Hangata capillary e phuthetsoe, e fetisetsoe kapa e chesetsoe moleng oa ho monya bakeng sa subcooling e eketsehileng ho thibela mokelikeli o ka capillary hore o se ke oa bela.Hobane capillary e thibela le ho lekanya ho phalla ha mokelikeli ho ea mouoane, e thusa ho boloka ho theoha ha khatello e hlokahalang hore tsamaiso e sebetse hantle.
The capillary tube le compressor ke likarolo tse peli tse arolang lehlakore la khatello e phahameng ho tloha lehlakoreng le tlaase la khatello ea tsamaiso ea sehatsetsing.
Capillary tube e fapane le sesebelisoa sa metering ea valve ea ho atolosa ka hore ha e na likarolo tse tsamaeang 'me ha e laole mocheso o moholo oa evaporator tlas'a boemo leha e le bofe ba mocheso oa mocheso.Esita le ha ho se na likarolo tse tsamaeang, li-tubes tsa capillary li fetola lebelo la ho phalla ha evaporator le / kapa khatello ea tsamaiso ea condenser e fetoha.Ha e le hantle, e finyella katleho e nepahetseng feela ha likhatello tse ka lehlakoreng le phahameng le le tlaase li kopantsoe.Sena ke hobane capillary e sebetsa ka ho sebelisa phapang ea khatello pakeng tsa mahlakore a phahameng le a tlaase a khatello ea tsamaiso ea sehatsetsing.Ha phapang ea khatello pakeng tsa mahlakoreng a phahameng le a tlaase a tsamaiso e ntse e eketseha, ho phalla ha sehatsetsing ho tla eketseha.Li-capillary tubes li sebetsa ka mokhoa o khotsofatsang holim'a mefuta e mengata e fapaneng ea ho theoha ha khatello, empa ka kakaretso ha e sebetse hantle.
Kaha capillary, evaporator, compressor le condenser li hokahane ka letoto, sekhahla sa phallo ka har'a capillary se tlameha ho lekana le lebelo la pompo le theohang la compressor.Ke ka lebaka leo bolelele bo lekantsoeng le bophara ba capillary ka mouoane o baloang le likhatello tsa condensation li bohlokoa 'me li tlameha ho lekana le matla a pompo tlas'a maemo a tšoanang a moralo.Liphetoho tse ngata haholo ka har'a capillary li tla ama khanyetso ea eona ho phalla ebe e ama botsitso ba sistimi.
Haeba capillary e le telele haholo 'me e hanyetsa haholo, ho tla ba le thibelo ea phallo ea sebakeng seo.Haeba bophara bo le bonyenyane haholo kapa ho na le liphetoho tse ngata haholo ha ho tsoelipana, matla a tube a tla ba tlase ho feta a compressor.Sena se tla fella ka khaello ea oli ka har'a mouoane, ho baka khatello e tlase ea ho monya le ho chesa haholo.Ka nako e ts'oanang, mokelikeli oa subcooled o tla phalla ho khutlela ho condenser, ho theha hlooho e phahameng hobane ha ho na moamoheli tsamaisong ea ho tšoara sehatsetsing.Ka hlooho e phahameng le khatello e tlase ho mouoane, sekhahla sa phallo ea sehatsetsing se tla eketseha ka lebaka la ho theoha ha khatello e phahameng ho pholletsa le tube ea capillary.Ka nako e ts'oanang, ts'ebetso ea compressor e tla fokotseha ka lebaka la tekanyo e phahameng ea compression le katleho e tlase ea volumetric.Sena se tla qobella tsamaiso ho leka-lekana, empa ka holimo hloohong le khatello e tlaase ea mouoane e ka lebisa ho se sebetse ho sa hlokahaleng.
Haeba khanyetso ea capillary e le tlase ho feta e hlokahalang ka lebaka la bophara bo bokhutšoanyane haholo kapa bo boholo haholo, sekhahla sa phallo ea sehatsetsing se tla ba seholo ho feta matla a pompo ea compressor.Sena se tla fella ka khatello e phahameng ea mouoane, mocheso o tlase haholo le likhohola tse ka bang teng tsa compressor ka lebaka la ho tlala haholo ha mouoane.Subcooling e ka theoha ka har'a condenser e bakang khatello e tlase ea hlooho esita le tahlehelo ea tiiso ea metsi ka tlase ho condenser.Hlooho ena e tlase 'me e phahame ho feta khatello e tloaelehileng ea mouoane e tla fokotsa tekanyo ea khatello ea compressor e fellang ka katleho e phahameng ea volumetric.Sena se tla eketsa bokhoni ba compressor, e ka leka-lekaneng haeba compressor e khona ho sebetsana le phallo e phahameng ea sehatsetsing ka mouoane.Hangata ho etsahala hore sehatsetsi se phalle ho compressor, e leng se etsang hore compressor e hlolehe.
Bakeng sa mabaka a thathamisitsoeng ka holimo, ke habohlokoa hore tsamaiso ea capillary e be le tefiso e nepahetseng (ea bohlokoa) ea sehatsetsi tsamaisong ea bona.Sehatsetsi se ngata haholo kapa se senyenyane haholo se ka lebisa ho se leka-lekaneng ho tebileng le tšenyo e tebileng ho compressor ka lebaka la phallo ea mokelikeli kapa likhohola.Bakeng sa boholo bo nepahetseng ba capillary, ikopanye le moetsi kapa sheba chate ea boholo ba moetsi.Letlapa la nameplate kapa nameplate ea sistimi e tla bonts'a hantle hore na sistimi e hloka sehatsetsi se kae, hangata ka karolo ea leshome kapa lekholo la ounce.
Ka meroalo e phahameng ea mocheso oa evaporator, litsamaiso tsa capillary hangata li sebetsa ka mocheso o phahameng haholo;ha e le hantle, mocheso o matla oa evaporator oa 40° kapa 50°F ha o tloaelehe ha o le mocheso o phahameng oa mouoane.Sena se bakoa ke hore sehatsetsi se ka har'a mouoane se fetoha mouoane ka potlako 'me se phahamisa ntlha ea 100% ea mouoane ka har'a mouoane, e leng se fanang ka tsamaiso ea mocheso o phahameng haholo.Li-capillary tubes ha li na mokhoa oa ho fana ka maikutlo, joalo ka sebonela-hōle sa thermostatic expansion valve (TRV), ho bolella sesebelisoa sa ho metha hore se sebetsa ka mocheso o phahameng haholo le ho se lokisa ka bohona.Ka hona, ha mojaro oa evaporator o phahame mme mocheso o phahameng oa evaporator o phahame, tsamaiso e tla sebetsa ka mokhoa o sa sebetseng haholo.
Ena e ka ba e 'ngoe ea mathata a ka sehloohong a tsamaiso ea capillary.Litsebi tse ngata li batla ho eketsa sehatsetsi ho feta tsamaisong ka lebaka la ho baloa ha mocheso o phahameng haholo, empa sena se tla tlatsa tsamaiso feela.Pele o kenya sehatsetsing, hlahloba lipalo tse tloaelehileng tsa mocheso o phahameng ka mocheso o tlase oa mouoane.Ha thempereichara sebakeng sa sehatsetsing e fokotsehile ho mocheso o lakatsehang 'me mouoane o le tlas'a mocheso o tlase oa mocheso, mocheso o tloaelehileng oa evaporator hangata ke 5° ho isa ho 10°F.Ha u belaela, bokella sehatsetsing, tlosa tsamaiso 'me u kenye tefiso ea bohlokoa ea sehatsetsing e bontšitsoeng ho nameplate.
Hang ha mocheso o phahameng oa mouoane o fokotsehile 'me sistimi e fetohela ho mojaro o tlase oa mocheso oa mouoane, mouoane oa 100% sebaka sa boemo bo tla fokotseha nakong ea ho qetela ea mouoane.Sena se bakoa ke ho fokotseha ha sekhahla sa mouoane oa sehatsetsing ka mouoane ka lebaka la mojaro o tlase oa mocheso.Hona joale sistimi e tla ba le mocheso o tloaelehileng oa mouoane o ka bang 5° ho isa ho 10°F.Litekanyo tsena tse tloaelehileng tsa mocheso o phahameng oa evaporator li tla etsahala feela ha mocheso oa mocheso oa evaporator o le tlase.
Haeba tsamaiso ea capillary e tletse, e tla bokella mokelikeli o feteletseng ka har'a condenser, e leng se bakang hlooho e phahameng ka lebaka la khaello ea moamoheli tsamaisong.Ho theoha ha khatello pakeng tsa mahlakore a tlaase le a phahameng a tsamaiso ho tla eketseha, ho etsa hore sekhahla sa ho phalla ho mouoane se eketsehe 'me mouoane o be o imetsoe, e leng se etsang hore ho be le mocheso o tlaase.E ka ba ea phalla kapa ea koala compressor, e leng lebaka le leng leo ka lona litsamaiso tsa capillary li tlamehang ho qosoa ka thata kapa ka mokhoa o nepahetseng ka tekanyo e boletsoeng ea sehatsetsing.
John Tomczyk is Professor Emeritus of HVACR at Ferris State University in Grand Rapids, Michigan and co-author of Refrigeration and Air Conditioning Technologies published by Cengage Learning. Contact him at tomczykjohn@gmail.com.
Litaba tse tšehelitsoeng ke karolo e lefuoang e khethehileng moo lik'hamphani tsa indasteri li fanang ka litaba tsa boleng bo holimo, tse hlokang leeme, tseo e seng tsa khoebo ka lihlooho tse khahlang bamameli ba litaba ba ACHR.Litaba tsohle tse tšehelitsoeng li fanoa ke lik'hamphani tsa papatso.Na o khahlehela ho kenya letsoho karolong ea rona ea litaba tse tšehelitsoeng?Ikopanye le moemeli oa sebaka sa heno.
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