2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、外文翻譯外文翻譯(英文原文英文原文)ABSTRACTThewkingprinciplesthebasicfeaturesofairconditioningwaterheater(ACWH)systemareintroducedinthispaper.Theairconditioningwaterheatersystemcanoperateinfivemodes:waterheatingonlyspacecoolingwaterheati

2、ngspaceheatingwaterheatingspacecoolingspaceheating.Comparativelythesystemcanprovidemuchbetterenergyperfmancehigherequipmentutilizationthroughoutayearcauselessthermalpollutionthanheatpumpwaterheatercommonairconditioner.Ap

3、rototypewithfivemodeswasassembledtestedattheambienttemperaturefrom7℃to43℃especiallywhenfrosting.Whenitwksinthewaterheatingmodeitcansupply55℃hotwaterwithintwominutesthecondensingpressureisjustsamewithcommonairconditioner.

4、Whensomemodesswitchthetemperatureoftheoutlethotwaterisconstant.TheeticalanalysisexperimentalstudyweredonetotheACWHinthisthesis:1.TheprototypewastestedintheairconditionerlabatyofGREE.Thetestingdataindicatethattheprototype

5、accdswellwiththenationalstardsofairconditionerheatpumpwaterheater.2.BasedontheexperimentalresultsanalysiswasdoneontheACWHinmainoperatingmodessomeimptantconclusionsweregiven，Theresultsindicatethatthenewsystemcansaveenergy

6、throughmultidutiesitcanwkstablyinfivewkmodeswithhighefficiency.Comparedwithothermodelsthenewsystemalsoincludesairconditioningunitwaterheaterunitbutwithfewercomponentshigherreliability.Basedoncommonairconditionerthissyste

7、mcanofferapracticablesolutioncouplingairconditionerwaterheater.Itmustbechangingthemarketsofbothairconditionerwaterheater.1.INTRODUCTIONTheheatpumpwaterheater(HPWH)hasbeenusedsince1950smainlyfhouseholdapplications.Itabsbs

8、heatenergyfromtheambientairtoacquirehotwater.Inthelast20yearsthestudyintendstodesignheatpumpwaterheaterwithhighreliabilitypracticabilitymanymanufacturersturntoofferthisproductionbasedonenvironmentalprotectionenergysaving

9、.InSouthAfricaHPWHhasperated16percentofthemarketsharefcommercialwaterheaters.Becauseofthehighlyprimarycostitisdifficulttobecomethealternativetothecommonwaterheater.HoweverifwecanofferanairconditionercoupledwithHPWHsystem

10、whichcanactasairconditionerwaterheaterwiththemaincomponentssuchasheatexchangerscompressfourwayvalvetheotherisheatingwaterwithwaterrecycleintheadiabaticwatertank.Thecontrollercanadjusttheoperatingmodeaccdingtothewaterleve

11、lsenssinthetank.Awatervalveisplacedatthehotwateroutletwhichcanbeadjustedtocontrolthewaterflowkeepthecondensingpressureconstant.Whenthetapwatergoesintothewaterrefrigerantheatexchanger(WRHE)itwillbeheatedto5055directlywith

12、intwominutes.Ifneeded℃theoutletwatertemperaturecanbesetbyadjustingthewatervalve.AsshowninFigure1whenthepowerisonthecompresssuckslowpressurerefrigerantgasthendisgeshighpressuregasintowaterrefrigerantheatexchanger(WRHE)whe

13、rerefrigerantiscondensedwaterisheateddirectly.Afterheatexchangestheliquidrefrigerantflowsacrossfourwayvalvethenitisthrottledtolowtemperaturelowpressureliquidgasbyanelectronicexpansionvalve.Refrigerantflowsintooutdoaircoo

14、ledcondenserwhereitisevapatedbecomeslowpressuregas.Whenthelowpressuregasreturnstothecompressthecirclebeginsagain.Inthismodevalve1isclosedvalve2isopen.Whenheatingwatertheoutdoaircooledunitactsasevapattheindofandoesn’trun.

15、TheCOPwispresentedasafunctionofpowerQwtheelectricpowerWasshowninEquation(1).COPw=QwW=MC△T(1)WhereMisthemassflowofwaterCisthespecificheatofwater△Tisthewatertemperaturedifferencebetweenoutletinletofthewaterrefrigerantheate

16、xchanger(WRHE).1.2SpacecoolingWaterheating(SCWH)ModeInsummerwiththerecoveryofcondensingheattheindoairiscooleddownatthesametime.ComparedwithwaterheatingmodethehightemperaturerefrigerantisalsocondensedintheWRHEdirectlythen

17、goesthroughtheaircooledcondensertobesupercooledwheretheoutdofandoesn’trun.Itisthrottledbycapillary1tolowtemperatureliquidgastheindoairexchangesheatwithreturnedrefrigerant.Inthismodevalve1isopenvalve2isclosed.Thismodecana

18、ctasspacecoolingwaterheatingatthesametime.Howeveritisnotnecessarytorecovertheentirecondensingheatwhichcanbereleasedintheaircooledcondenser.ThetotalcapacityisthesumofcoolingcapacityQcheatingcapacityQwthentotalCOPcwcanbesh

19、ownastheEquation(2).COPcw=(Qc＋Qw)W(2)2.3SpaceheatingWaterheatingModeRefrigerantflowsacrossWRHEevapatcapillary2capillary1aircooledcondenserinturn.SpaceheatingWaterheatingcanrealizeinthey.Thismodesometimesmaynotmeetcustome

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