Abstract: The composite phase change energy storage material was prepared by adding porous expanded graphite and sodium metasilicate nonahydrate to disodium hydrogen phosphate dodecahydrate (DHPD). The effects of expanded graphite on the properties of DHPD were studied by using scanning electron microscope,temperature inspector, differential scanning calorimeter etc. The experimental results showed that when 4% expanded graphite was added, the supercooling degree of DHPD decreased from 14.3℃ to 5.9℃, the phase separation could be eliminated and the thermal conductivity of composite phase change materials could be greatly enhanced when 6% expanded graphite was added. The optimal formula of compound phase change energy storage material was 6%EG+4%Na2SiO3·9H2O＋90%Na2HPO4·12H2O, the latent heat of the phase-change material was 220.6 J/g,the phase transition temperature was 33.6℃, the thermal conductivity was 2.42 W/(m·K), and the supercooling degree was 1.5℃. Compared with pure DHPD, the supercooling degree decreased by 89.5%, and the thermal conductivity increased by 3.4 times.After 300 cycles of cooling and heating, the thermal performance of the composite material such as latent heat of phase change, thermal conductivity, and supercooling is stable and good.
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2020, Vol. 34 
