Electric　heater　defrosting　(EHD)　is　extensively　used　on　refrigerator　evaporators.　However,　this　method　has　a　high　level　of　energy　consumption.　Conversely,　reverse-cycle　defrosting　(RCD)　cannot　be　used　in　refrigerators　because　frequent　reversal　of　the　four-way　valve　may　cause　mass　leakage　of　the　refrigerant,　which　is　unsafe.　Hence,　we　develop　a　bypass　cycle　defrosting　system　using　compressor　casing　thermal　storage　(BCD-CCTS).　Experiments　utilizing　the　EHD　and　BCD-CCTS　methods　are　conducted　on　a　refrigerator　with　a　50　W　compressor.　Experimental　results　reveal　that　in　the　BCD-CCTS　method,　defrosting　time　decreased　by　65-77%　compared　with　180-419W　EHD.　Whereas　defrost　energy　consumption　decreased　by　89-92%　compared　with　180-419W　EHD　method.　After　60　h　of　normal　operation,　the　temperature　of　the　compressor　casing　exposed　to　air　was　maintained　at　approximately　60　degrees　C,　whereas　that　of　the　compressor　casing　exposed　to　the　heat　storage　phase　change　material　(PCM)　was　maintained　at　about　54　degrees　C.　The　presence　of　heat　storage　PCM　can　effectively　reduce　the　temperature　of　the　compressor　casing.　It　can　also　reduce　the　operating　noise　of　the　compressor　by　18.5%　compared　with　the　same　type　of　compressor　without　heat　storage　PCM.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.