Quaternary disodium hydrogen phosphate dodecahydrate based phase change heat storage material with low supercooling degree

The invention discloses a quaternary Na2HPO4.12H2O-based phase change heat storage composite material. The quaternary Na2HPO4.12H2O-based phase change heat storage material is prepared from the following components in percentage by mass: 75-95% of Na2HPO4.12H2O, 3-22% of Na2SO4.10H2O, 1-5% of Na2SiO3.9H2O and 1-7% of graphite. The composite material is also prepared from water, wherein the mass ratio of the composite material to the water is 1 to (1 to 1.3). The quaternary Na2HPO4.12H2O-based phase change heat storage composite material involves in phase change heat storage materials, intensified heat conduction and supercooling degree reduction in heat energy utilization, and has the advantages that control of the supercooling degree of the Na2HPO4.12H2O-based phase change heat storage material is realized, application range is widened, and application stability is improved. 本发明公开了种四元NaHPO*12HO基相变蓄热复合材料，其各组分及其质量百分含量为：NaHPO*12HO 75%~95%；NaSO*10HO 3%~22%；NaSiO·9HO 1%~5%；石墨1%~7%。上述复合材料中还含有水，其中复合材料与水的质量比为1：（1~1.