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Energies 2016,9, 240 vehiclemileageasverified in thecitedreports. Furthermore, themultiplesourceheatpumpsystemis alsoausefulmethodtoenhancethecooling/heatingcapacityandtheCOPof theACsysteminEV, especially incoldweatherconditions. Theheatsources includeair,wasteheat, solarheat,waterand soon. Consideringthe tremendousdevelopment in theheatpumpACsystemfield, it isworthwhile to bemindful that there isnoonesingle technologythatcanobtain ideal results tocontrol theclimate in anEVallyear round.Acombinationofseveralof these technologies is stillnecessarymoreoften than not.Althoughsomeof the innovative technologiesdescribedinthispaperarestillpartofon-going research,webelieve therealpracticalapplication inEVs is imminent. The integratedheatpumpAC systembasedonthe two-stageCO2 cycle,which isequippedwithavariablecapacitycompressorand uses thewasteheat fromelectricdevicesasanadditionalheat source, shouldbeconsideredforEVs in thecomingresearch. Acknowledgments:Thisworkwassupportedbythe Industry-University-Research InstituteCollaborationFund ofGuangdongProvince (No. 2011B090400572),StrategicEmergingIndustryDevelopmentFundofGuangdong Province (No. [2011]891),NaturalScienceFoundationofGuangdongProvince (No. S2012010010199),Scienceand TechnologyInnovationFundProjectofFoshanCity (No. 2013AG100063). Conflictsof Interest:Theauthorsdeclarenoconflictof interest. References 1. Mei,V.C.;Chen,F.C.;Mathiprakasam,B.;Heenan,P.Studyofsolar-assistedthermoelectric technologyfor automobileair conditioning. J.Sol. Energy1993,115, 200–205. [CrossRef] 2. Ma,G.Y.Studyonthermoelectricair conditioningforelectricvehicles.Refrig.AirCond. 1998,14, 5–10. 3. Cao,Z.Y.SolutiontoairconditioningonEVs.AutoElectric. Parts2008,47, 1–4. 4. Zhang, J.Z.Structural featuresof fullyelectricair conditioningsystem.Automob.Maint. 2006,12, 4–5. 5. Guyonvarch,G.;Aloup,C.;Petitjean,C.SavasseADMD.42VElectricAirConditioningSystems(E-A/CS) forLow Emissions,Architecture,Comfort andSafetyofNextGenerationVehicles; SAETechnicalPaperNo. 2001-01-2500; SAEInternational:Warrendale,PA,USA,2001. 6. Randall,B.BlowingHotandCold. Availableonline: https://www.teslamotors.com/blog/blowing-hot- and-cold(accessedon20December2006). 7. Torregrosa,B.; Payá, J.;Corberán, J.M.Modelingofmobileair conditioningsystems forelectricvehicles. InProceedingsof the4thEuropeanWorkshop—MobileAirConditioningandVehicleThermalSystems, Torino, Italy,1–2December2011. 8. Lee,D.Experimental studyontheheatpumpsystemusingR134arefrigerant forzero-emissionvehicles. Int. J.Automot. Technol. 2015,16, 923–928. [CrossRef] 9. Qi,Z.G.Advancesonair conditioningandheatpumpsysteminelectricvehicles—Areview.Renew. Sustain. EnergyRev. 2014,38, 754–764. [CrossRef] 10. Shi,B.X.;Ma,G.Y.;Chen,G.S.Researchonheatpumpsystemsforelectricvehicleairconditioning.FluidMach. 2002,30, 48–50. 11. Billiard,F.Refrigerationandairconditioning:What’snewatregulatory level. InProceedingsof theNinth EuropeanConferenceonTechnological Innovations inRefrigeration,AirConditioningand in theFood Industry,Milano, Italy,29–30 June2001. 12. EuropeanParliament (EUROPA).Regulation (EC)No. 842/2006of theEuropeanParliament andof the Councilof17May2006oncertainfluorinatedgreenhousegases.Off. J.Eur.Union2006,L161, 1–11. 13. EuropeanParliament (EUROPA).Directive2006/40/ECof theEuropeanParliamentandof theCouncilof 17May2006relatingtoemissions fromair-conditioningsystemsinmotorvehiclesandamendingcouncil directive70/156/EEC.Off. J.Eur.Union2006,L161, 12–18. 14. Pettersen, J.;Lorentzen,G.ANew,Efficient andEnvironmentallyBenignSystemforAutomobileAirConditioning; SAETechnicalPaperNo. 931129;SAEInternational:Warrendale,PA,USA,1993. 15. McEnaney, R.; Hrnjak, P. Clutch Cycling Mode of Compressor Capacity Control of Transcritical R744 Systems Compared to R134a Systems; SAE Technical Paper No. 2005-01-2033; SAE International: Warrendale,PA,USA,2005. 357