Investigation On The Heat Storage Performance Of Sodium Acetate Trihydrate As Phase Change Material For Heat Storage

Inorganic hydrated salts are the most typical in low-temperature phase change materials as heat storage, which have the advantages such as wide utilization, bigger fusion heat, higher heat storage density, good thermal conductivity, easy source, cheap price and generally showing neuter, etc. Thus, they are more and more attention by people in the field of solar low-temperature heat utilization, building heating, living hot water, life commodity and so on. Among, sodium acetate trihydrate is the most development prospects in hydrated salt phsae change materials as heat storage, and which have been became the study object for many researchers in recent years. But before unmodified, sodium acetate trihydrate as a phsae change materials for heat storage has serious supercooling and phase stratification, also its thermal cycling stability is very poor. So it is hard to get application in practice.First, through the heat-cooling experiments, the thermal characteristics of pure sodium acetate trihydrate were studied and discussed in this paper. Then, through a lot of nucleating agent screening tests, studied the impact of different nucleating agents and different dosage of the same nucleating agent to supercooling degree of sodium acetate trihydrate. And identified several effective nucleating agents and theirs optimum dosage. Then studied the impact of constant temperature to supercooling degree of the heat storage system, and thinked the constant temperature of system was suitable for 65℃. Through the experiments of contrasting thickener effect, the effective thickener for different heat storage systems were screened.At last, through the heat-cooling thermal cycling and differential scanning calorimetry(DSC) testing experiments, studied the thermal cycling stability of several heat storage systems of sodium acetate trihydrate after modified. And the components and structure of the heat storage system were measured by X-ray diffractometer after thermal cycling. Then several reasons for the reduction in thermal cycling stability of the heat storage system were analysed. This article through studies, got a heat storage system with small supercooling degree, no obvious phase stratification and good thermal cycling stability, its formula is 10g of sodium acetate trihydrate and 0.05g of sodium pyrophosphate decahydrate and 0.3g of CMC.