The phase change heat storage electric heater uses the low valley electricity at night to store heat for room heating during the day

which can realize peak regulation of electricity and reduce the heating operation cost of users. In this paper

a composite phase change material was developed by taking magnesium chloride hexahydrate(MgCl_2·6H_2O) as the phase change material substrate. Porous expanded graphite(EG) was added to eliminate the phase separation phenomenon

and nucleating agent calcium hydroxide(Ca(OH)_2) was added to reduce the supercooling degree of the phase change material. By optimizing the thermal properties of the MgCl_2·6 H_2O-EGCa(OH)_2 composite phase change materials with different formulations

it was found that when the mass ratio of MgCl_2·6 H_2O/EG/Ca(OH)_2 was 91.5%/7.5%/1%

the composite phase change material could effectively eliminate the supercooling degree and phase separation phenomenon and maintain high latent heat of phase change. By using this composite phase change material

a phase change heat storage electric heater heat storage and heat release performance experiment table was built

and the heat storage and heat release performance of the electric heater under different operation modes were compared. The results show that

the equipment can keep the indoor environment at a comfortable temperature under the working condition of night heat storage

daytime heat release and heat supplement. The equipment can achieve higher heat storage efficiency

and the actual heat storage efficiency is 63.8% under the paper working condition. Compared with the conventional heating mode

this equipment has lower operation cost and good economic benefits.