运用两级喷射式制冷提高客运汽车空调性能的理论与实验研究.docx

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1、运用两级喷射式制冷提高客运汽车空调性能的理论与实验研究Thecurrentworldsituationofanincreasingpopulationisleadingtoanincreaseinthefuelconsumption,greenhousegasemissions,electricalpowerconsumptionetc.Theseincreasesarebecomingaseriousproblemwhichvariousorganizationsareconcernedaboutandaretryingtosolve.Anincreaseofbusaircond

2、itioningsystemsincreasesfuelconsumptionandthereforeproducesgreenhousegasemissionsasconventionalbusairconditionersarevaporcompressionsystemsdrivenbyenginepower.Inordertoreducethefuelconsumptionandgasemissionofabus,atwostageejectorcoolingsystemisselectedtostudybecausethesystemrequireslittleelect

3、ricalpowerorenginepowertodrivethesystem.Itusesexhaustgasemissionsfrombusestodrive.Thetwostageejectorcoolingsystemisusedtocoolcondensatefromthecondenserofabusairconditionertoasubcoolingstateinordertoenhancetheperformanceofvaporcompressionsystem.Theobjectiveofthisresearchistostudyintheoreticalan

4、dexperimentalperformancesofatwostageejectorcoolingsystemusingthewasteheatoftheengine(exhaustgases).Todevelopacombinedairconditioningsystemwithatwostageejectorcoolingsubsystemandavaporcompressionsubsystemandevaluatingtheapplicationsofatwostageejectorcoolingsystemtoenhancetheperformanceofthetrad

5、itionalbusairconditioning(vaporcompressionsystem).ThecoolingcapacityobtainedfromthetwostageejectorcoolingsubsystemisinturnusedtocoolthecondensateofthevaporcompressionsubsystemtoasubcooledstatetoincreasetheCOPofthevaporcompressionsubsystem.Theejectorcoolingsystemuseswaterastheworkingfluid;thede

6、signoperatingconditionshaveageneratingtemperatureof150℃,acondensingtemperatureof54℃andanevaporatingtemperatureof13℃,Inthiswork,variablesweretestedinordertounderstandtheapplicationofthesystemandtheeffectofvaryingoperatingconditions.Inaddition,thecomparisonoftheperformancebetweenthesinglestagean

7、dtwostageejectorcoolingsystemhasbeencarriedout.Theresultsindicatethatatwostageejectorcoolingsystemcandecreasethetemperatureofthecondensatefromthecondenserfrom54℃to26.5℃underoperatingconditionswithageneratingtemperatureof150℃andanevapora