Kuyika ndi kufananiza valavu yowonjezera ya chiller

1. Kufananiza

Malinga ndi kukana kutayika kwa R, Q0, t0, tk, mapaipi amadzimadzi ndi ma valve, masitepe ndi awa:

Dziwani kusiyana kwapakati pakati pa malekezero awiri a valve yowonjezera;

Dziwani mawonekedwe a valve;

Sankhani chitsanzo ndi ndondomeko ya valve.

1. Dziwani kusiyana kwa kuthamanga pakati pa mbali ziwiri za valve:

ΔP=PK-ΣΔPi-Po(KPa)

Mu chilinganizo: PK―― condensing pressure, KPa, ΣΔPi――is ΔP1+ΔP2+ΔP3+ΔP4 (ΔP1 ndi kutayika kwa chitoliro chamadzimadzi; ΔP2 ndi kutayika kwa chigongono, valve, etc.; ΔP3 ndi kukwera kwa chitoliro chamadzimadzi Kutaya mphamvu, ΔP3 = ρɡh; ΔP4 ndikutaya kukana kwa mutu wogawira ndi capillary, kawirikawiri 0.5bar iliyonse); Po-evaporating pressure, KPa.

2. Dziwani mawonekedwe a vavu:

Kusankha bwino mkati kapena kunja kumadalira kutsika kwapakati mu evaporator. Kwa dongosolo la R22, pamene kupanikizika kumadutsa kutentha kofanana ndi evaporation ndi 1 ° C, valavu yowonjezera yowonjezera kutentha iyenera kugwiritsidwa ntchito.

3. Sankhani chitsanzo ndi ndondomeko ya valve:

Malingana ndi Q0 ndi ΔP yowerengedwa isanayambe komanso itatha valavu yowonjezera ndi kutentha kwa evaporation t0, yang’anani chitsanzo cha valve ndi mphamvu ya valve kuchokera pa tebulo loyenera. Kuti muchepetse njira zofananira, zitha kuchitidwanso molingana ndi kapangidwe kaukadaulo. Chitsanzo ndi ndondomeko ya valavu yowonjezera kutentha yomwe ilipo iyenera kutengera mtundu wa refrigerant yomwe imagwiritsidwa ntchito mu firiji, kutentha kwa kutentha kwa mpweya ndi kukula kwa kutentha kwa evaporator. Kusankhidwa kuyenera kukwaniritsa zofunikira izi:

(1) Mphamvu ya valavu yowonjezera yowonjezera kutentha ndi 20-30% yaikulu kuposa kutentha kwenikweni kwa evaporator;

(2) Kwa machitidwe a firiji omwe alibe valavu yoyendetsera madzi ozizira kapena kutentha kwa madzi ozizira kumakhala kochepa m’nyengo yozizira, posankha valavu yowonjezera kutentha, mphamvu ya valve iyenera kukhala 70-80% yaikulu kuposa katundu wa evaporator, koma pazipita sayenera kupitirira 2 wa evaporator kutentha katundu. Nthawi;

(3) Posankha valavu yowonjezera kutentha, kutsika kwapaipi yamadzimadzi kumayenera kuwerengedwa kuti kupeze kusiyana kwapakati pasanayambe komanso pambuyo pa valve, ndiyeno ndondomeko ya valavu yowonjezera kutentha iyenera kutsimikiziridwa molingana ndi kuwerengera kwa valve yowonjezera. tebulo la mphamvu zoperekedwa ndi wopanga.

Awiri, kukhazikitsa

1. Yang’anani ngati ili bwino musanayike, makamaka gawo la makina ozindikira kutentha;

2. Malo oyikapo ayenera kukhala pafupi ndi evaporator, ndipo thupi la valve liyenera kuikidwa molunjika, osati lolunjika kapena lozungulira;

3. Mukayika, samalani kusunga madzi mu thumba la kutentha kwa kutentha nthawi zonse, kotero kuti thumba la kutentha liyenera kuikidwa pansi kuposa thupi la valve;

4. Sensa ya kutentha iyenera kuyikidwa pa chitoliro chobwerera chopingasa cha potulutsira evaporator momwe kungathekere, ndipo nthawi zambiri imayenera kukhala yopitilira 1.5m kutali ndi doko loyamwa la kompresa;

5. Thumba lozindikira kutentha lisayikidwe papaipi ndi madzi;

6. Ngati kutuluka kwa evaporator kuli ndi chosinthira chamadzimadzi cha gasi, phukusi lozindikira kutentha nthawi zambiri limakhala potuluka mu evaporator, ndiye kuti, pamaso pa chosinthira kutentha;

7. Bulu lozindikira kutentha nthawi zambiri limayikidwa pa chitoliro chobwerera cha evaporator ndikukulungidwa mwamphamvu pakhoma la chitoliro. Malo okhudzana ayenera kutsukidwa ndi oxide scale, kuwonetsa mtundu wachitsulo;

8. Pamene m’mimba mwake wa chitoliro cha mpweya wobwerera ndi wosakwana 25mm, thumba la kutentha likhoza kumangirizidwa pamwamba pa chitoliro cha mpweya wobwerera; pamene m’mimba mwake ndi wamkulu kuposa 25mm, akhoza kumangirizidwa pa 45 ° kumunsi kwa chitoliro cha mpweya wobwerera kuti ateteze zinthu monga kudzikundikira mafuta pansi pa chitoliro kuti zisakhudze kumverera. Lingaliro lolondola la babu la kutentha.

Chachitatu, kuyeretsa

1. Khazikitsani choyezera thermometer pamalo otulukira mpweya kapena gwiritsani ntchito mphamvu yoyamwa kuti muwone kuchuluka kwa kutentha kwakukulu;

2. Mlingo wa kutentha kwakukulu ndi wochepa kwambiri (madzi amadzimadzi ndi ochuluka kwambiri), ndipo ndodo yosinthira imazungulira theka la kutembenuka kapena kutembenukira kumodzi molunjika (ndiko kuti, kuwonjezera mphamvu ya kasupe ndi kuchepetsa kutsegula kwa valve), pamene kutuluka kwa firiji kumachepa; ulusi wowongolera umazungulira kamodzi Chiwerengero cha kutembenuka sikuyenera kukhala kochuluka (kuwongolera ndodo kumayenda kutembenuka kumodzi, kutentha kwakukulu kudzasintha pafupifupi 1-2 ℃), pambuyo pa zosintha zambiri, mpaka zofunika;

3. Njira yosinthira Empirical: Tembenuzirani screw ya ndodo yosinthira kuti musinthe kutsegula kwa valve, kuti chisanu kapena mame apange kunja kwa chitoliro chobwerera cha evaporator. Kwa chipangizo cha firiji ndi kutentha kwa evaporation pansi pa madigiri 0, ngati mutachigwira ndi manja anu mutatha chisanu, mudzakhala ndi kumverera kozizira kumangirira manja anu. Panthawiyi, digiri yotsegulira ndiyoyenera; chifukwa cha kutentha kwa evaporation pamwamba pa madigiri 0, condensation ikhoza kuonedwa ngati chiweruzo cha Situation.