Seite - 350 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2016,9, 240 Figure4.Mainelement technologiesof theelectriccompressor [48]. Inadditiontocompressors,heatexchangersalsohaveresearchhighlights.Cummings et al. [56] performedacomprehensivereviewof testingofACheatexchangers invehicles. Theyevaluatedthe actualperformanceofcondensersandevaporatorsofACsystemsthroughwindtunnel testingand road tests. Huang et al. [57] investigated the frostingcharacteristicsof anair-sourceheatpumpby varyingthefintypeof theoutdoorheatexchanger.Under frostingconditions, thedecreasingorders of both theaverageand themaximumvaluesof theheating capacity,COPand inputpowerwere flat,wavyandwavy/slitfins. Theaveragevaluesofheatingcapacity,COPandinputpower for the wavy/slitfins, comparedwith theflatfins,weredecreasedby14.57%,8.26%and7.11%,respectively. Thisconclusionprovidesabasis forselectingthefintypeforoutdoorheatexchangers.ACsystems withmicro-channel heat exchangerswereproposed in [58–60]. The representativemicro-channel evaporator is showninFigure5 [60]. Figure5. Schematicdiagramof themicrochannelevaporator: (a)Frontview(left) andsideview(right) of themicrochannelevaporator; (b)Louverfinusedin themicrochannelevaporator; (c)Microchannel tube [60]. 350