Five　commonly　used　thawing　methods　include　water　immersion　(WT),　lotic　water　(LT),　ambient　temperature　(AT),　refrigerator　(RT),　and　microwave　(MT)　thawing.　WT,　LT,　and　AT　cannot　maintain　a　specified　constant　temperature　during　thawing,　whereas　MT　consumes　substantial　energy.　On　the　basis　of　the　shortcomings　of　the　above　methods,　a　constant　temperature　water　immersion　thawing　system　using　fixed-frequency　refrigerator　compressor　casing　heat　storage　(CWT-CCTS)　is　designed.　The　CWT-CCTS　recycles　the　waste　heat　of　the　compressor　casing　and　uses　the　heat　to　thaw　frozen　food　in　constant　temperature　water.　The　new　system　not　only　provides　a　new　heat　source　for　thawing　but　also　reduces　the　overall　energy　consumption　and　noise　of　the　system　during　operation.　Under　a　stable　full-load　operating　condition　of　the　refrigerator,　CWT-CCTS　can　reduce　the　compressor　casing　and　discharge　temperatures　by　3.8　degrees　C　and　2.5　degrees　C,　respectively.　The　water　loss　rate　of　CWT-CCTS　is　only　15.9%　of　MT,　demonstrating　a　decrease　of　84.1%.　In　terms　of　thawing,　the　maximum　power　consumption　saved　by　the　device　is　516.79　kW　center　dot　h　per　year　in　comparison　with　MT,　and　the　cost　of　the　device　can　be　recovered　after　178　days　of　use