Chiyambi cha njira zochepetsera mafiriji

Ndizosapeŵeka kuti makina a furiji omwe akugwira ntchito ndi mpweya wodzaza ndi kutentha pansi pa kuzizira pamapeto pake adzapeza chisanu pamachubu ndi zipsepse za evaporator. Frost imakhala ngati insulator pakati pa kutentha komwe kumayenera kusamutsidwa kuchokera mumlengalenga ndi refrigerant, zomwe zimapangitsa kuchepa kwa mphamvu ya evaporator. Choncho, opanga zipangizo ayenera kugwiritsa ntchito njira zina kuti nthawi ndi nthawi kuchotsa chisanu kuchokera koyilo pamwamba.Njira zochepetsera chisanu zingaphatikizepo, koma sizimangokhala ku off cycle kapena air defrost, magetsi ndi gasi (zomwe zidzakambidwe mu Gawo II m'magazini ya March). Ndiponso, kusintha kwa njira zoziziritsira chisanuzi kumawonjezera zovuta zina kwa ogwira ntchito mu utumiki wakumunda. Mukakhazikitsa bwino, njira zonse zidzakwaniritsa zomwezo zomwe zimafunikira pakusungunula chisanu. Ngati kuzizira sikunakhazikitsidwe bwino, kuwonongeka kosakwanira kwa chisanu (ndi kuchepa kwa mpweya wabwino) kungayambitse kutentha kwambiri kuposa momwe mumafunira mufiriji, kusefukira kwamadzi kapena kudulidwa kwamafuta.
Mwachitsanzo, chikwama chowonetsera nyama chomwe chimakhala ndi kutentha kwa 34F chikhoza kukhala ndi kutentha kwa mpweya pafupifupi 29F ndi kutentha kwa evaporator kwa 22F. Ngakhale uku ndi kutentha kwapang'onopang'ono komwe kutentha kwazinthu kumakhala pamwamba pa 32F, machubu a evaporator ndi zipsepse zimakhala pa kutentha kosachepera 32F, motero kumapangitsa kuti chisanu chiwunjikane. Kutentha kwapang'onopang'ono kumakhala kofala kwambiri pamatenthedwe apakati, komabe sizachilendo kuwona kuphwanyidwa kwa gasi kapena kutenthedwa kwamagetsi pamagetsiwa.

refrigeration defrost
Chithunzi 1 Kuchuluka kwa Frost

OFF CYCLE DEFROST
An off cycle defrost ndi monga zikumveka; defrosting imatheka mwa kungotseka kuzungulira kwa firiji, kuteteza refrigerant kulowa mu evaporator. Ngakhale evaporator ikugwira ntchito pansi pa 32F, kutentha kwa mpweya mufiriji kumapitilira 32F. Firiji itazimitsidwa, kulola kuti mpweya wa mufiriji upitirire kuyendayenda kudzera mu chubu/zipsepse za evaporator kumakweza kutentha kwa pamwamba, kusungunula chisanu. Kuonjezera apo, kulowetsedwa kwa mpweya wabwino mufiriji kumapangitsa kuti kutentha kwa mpweya kukwera, kumathandizira kwambiri ndi defrost cycle. M'malo omwe kutentha kwa mpweya mufiriji kumakhala pamwamba pa 32F, kusungunula kwa chisanu kumakhala njira yabwino kwambiri yosungunulira chisanu ndipo ndiyo njira yodziwika kwambiri yochepetsera chisanu pa kutentha kwapakati.
Pamene defrost imayamba, kutuluka kwa refrigerant kumalepheretsa kulowa mu evaporator koyilo pogwiritsa ntchito njira imodzi: gwiritsani ntchito nthawi yochepetsera nthawi kuti muzungulire kompresa (gawo limodzi la kompresa), kapena kuzungulira makina amadzimadzi a solenoid valve kuyambitsa kupopera pansi (compressor unit imodzi kapena multiplex kapena compressor regula valavu) mu choyikapo multiplex.

refrigeration defrost
Chithunzi 2 Chithunzi chofananira cha defrost/pumpdown wiring

Chithunzi 2 Chithunzi chofananira cha defrost/pumpdown wiring
Zindikirani kuti mu pulogalamu imodzi ya kompresa pomwe wotchi ya nthawi yoziziritsa imayambitsa kuzungulira kwa mpope, valavu yamadzimadzi ya solenoid nthawi yomweyo imachotsedwa mphamvu. Compressor idzapitiriza kugwira ntchito, ikukoka firiji kunja kwa dongosolo lotsika ndi kulowa mu cholandirira madzi. Compressor imazungulira pomwe mphamvu yoyamwa igwera pagawo lodulidwa kuti muchepetse kuthamanga kwapansi.
Mu choyikapo chophatikizira cha multiplex, wotchi ya nthawi imayendetsa magetsi kupita ku valve solenoid yamadzimadzi ndi chowongolera choyamwa. Izi zimasunga kuchuluka kwa refrigerant mu evaporator. Pamene kutentha kwa evaporator kumawonjezeka, kuchuluka kwa refrigerant mu evaporator kumakhalanso ndi kuwonjezeka kwa kutentha, kumakhala ngati choyimira kutentha kuti chithandizire kukweza kutentha kwa pamwamba pa evaporator.
Palibe gwero lina la kutentha kapena mphamvu lomwe limafunikira kuti muchepetse chisanu. Dongosolo lidzabwereranso ku firiji pakangopita nthawi kapena kutentha kwafika. Pansi pake pakugwiritsa ntchito kutentha kwapang'onopang'ono kudzakhala pafupi ndi 48F kapena mphindi 60 kuchokera nthawi. Izi zimabwerezedwa mpaka kanayi patsiku kutengera malingaliro a wopanga (kapena W/I evaporator).

Kutsatsa
ELECTRIC DEFROST
Ngakhale kuti ndizofala kwambiri pamatenthedwe otsika, kupukuta kwamagetsi kungagwiritsidwenso ntchito pa kutentha kwapakati. Pazigawo zotentha kwambiri, kuzizira kozungulira sikothandiza chifukwa mpweya wa mufiriji ndi wochepera 32F. Choncho, kuwonjezera pa kutseka kuzungulira kwa firiji, gwero lakunja la kutentha limafunika kukweza kutentha kwa evaporator. Kutentha kwamagetsi ndi njira imodzi yowonjezerera kutentha kwakunja kusungunula chisanu.
Ndodo imodzi kapena zingapo zowotcha zimayikidwa mu utali wa evaporator. Pamene wotchi ya nthawi ya defrost imayambitsa kuzungulira kwa magetsi, zinthu zingapo zidzachitika nthawi imodzi:
(1) Chophimba chomwe chimakhala chotsekedwa mu wotchi yanthawi yoziziritsa yomwe imapereka mphamvu ku injini za evaporator fan idzatsegulidwa. Derali litha kuwongolera mwachindunji ma evaporator fan motors, kapena zotchingira zolumikizirana ndi ma evaporator fan motor. Izi zidzayendetsa ma injini a evaporator fan, kulola kutentha kochokera ku zotenthetsera zotenthetsera kuti zikhazikike pa evaporator pamwamba pokha, osati kusamutsidwa kumpweya womwe ungayendetsedwe ndi mafani.
(2) Wina kawirikawiri chatsekedwa lophimba mu defrost nthawi wotchi amene amapereka mphamvu kwa madzi mzere solenoid (ndi kuyamwa mzere chowongolera, ngati ntchito) adzatsegula. Izi zidzatseka valavu yamadzimadzi ya solenoid (ndi chowongolera ngati chikugwiritsidwa ntchito), kuteteza kutuluka kwa firiji kupita ku evaporator.
(3) Chosinthira chomwe chimatsegula nthawi zambiri pawotchi ya defrost chimatseka. Izi zitha kupereka mphamvu mwachindunji kwa zotenthetsera zotenthetsera (zing'onozing'ono zochepetsera heater), kapena kupereka mphamvu ku koyilo yogwirizira ya kontrakitala wa heater. Nthawi zina mawotchi apanga ma contactors okhala ndi ma amperage apamwamba omwe amatha kupereka mphamvu molunjika ku mawotchi a defrost, kuchotseratu kufunikira kwa cholumikizira cholumikizira chowotcha cha defrost.

refrigeration defrost
Chithunzi 3 Chotenthetsera chamagetsi, kuyimitsa kuziziritsa komanso kuchedwa kwa fan

Kuwotcha kwamagetsi kumapereka kusungunuka kwabwino kuposa kuzungulira, ndi nthawi yayifupi. Apanso, kuzungulira kwa defrost kutha pa nthawi kapena kutentha. Pakutha kwa defrost pakhoza kukhala nthawi yotsika; nthawi yaifupi yomwe idzalola kuti chisanu chosungunuka chidonthe kuchokera pamwamba pa evaporator ndi kulowa mu poto yothira. Kuphatikiza apo, ma evaporator fan motors azichedwa kuyambiranso kwakanthawi pang'ono mkombero wa firiji ukayamba. Izi ndikuwonetsetsa kuti chinyezi chilichonse chomwe chidakalipo pa evaporator sichidzawomberedwa mufiriji. M'malo mwake, imaundana ndikukhalabe pamtunda wa evaporator. Kuchedwa kwa fani kumachepetsanso kuchuluka kwa mpweya wofunda womwe umafalikira mufiriji pambuyo poti defrost yatha. Kuchedwetsa kwa mafani kumatha kuchitika ndi kuwongolera kutentha (thermostat kapena klixon), kapena kuchedwetsa nthawi.
Kuwotcha kwamagetsi ndi njira yosavuta yochepetsera madzi akamagwiritsidwa ntchito ngati sikothandiza. Magetsi amaikidwa, kutentha kumapangidwa ndipo chisanu chimasungunuka kuchokera ku evaporator. Komabe, poyerekezera ndi defrost, defrost yamagetsi imakhala ndi zinthu zingapo zoyipa: monga ndalama zomwe zimangowononga nthawi imodzi, mtengo wowonjezera wa ndodo zotenthetsera, zolumikizira zowonjezera, zolumikizirana ndi kuchedwetsa, komanso ntchito yowonjezereka ndi zida zofunika pakuyatsa kumunda ziyenera kuganiziridwa. Komanso, mtengo wopitilira wamagetsi owonjezera uyenera kutchulidwa. Kufunika kwa gwero lamphamvu lakunja kuti azipatsa mphamvu zotenthetsera kumabweretsa chiwongolero cha mphamvu zonse poyerekeza ndi kuzungulira.
Chifukwa chake, ndizomwe zimayendera panjira, kuyimitsa mpweya komanso njira zochotsera magetsi. M'magazini ya March tidzakambirananso za defrost ya gasi mwatsatanetsatane.