Experiments are performed on the effect of local cooling by thermoelectric cooler on triggering solidification of supercooled sodium acetate trihydrate (SAT). Factors such as the water content

the SAT sample mass as well as the input power of the thermoelectric cooler are examined about their effects on the crystallization activation and discharging characteristics. The results showed that with the increase of water content

the overall crystallization induction period increased

the heat release temperature decreased

and the water content of 44% was used as the ideal system ratio. The crystallization induction period was 2 min and the stable exothermic temperature was 52.8℃. The higher the input power(P) is

the faster the unit is cooled and the induction time period for P=280 W is one third of that for P=70 W. The probability of nucleation of samples is increased for higher sample mass and then the induction time is shorter with higher discharging temperature and longer heat release time.