scholarly journals Studies on Salt Hydrates for Latent Heat Storge. VI. Preheating Effect on Crystallization of Sodium Acetate Trihydrate from Aqueous Solution with a Small Amount of Disodium Hydrogenphosphate

1984 ◽  
Vol 57 (2) ◽  
pp. 561-563 ◽  
Author(s):  
Takahiro Wada ◽  
Yoshihiro Matsuo
Keyword(s):  
Aqueous Solution ◽  
Latent Heat ◽  
Sodium Acetate ◽  
Sodium Acetate Trihydrate ◽  
Acetate Trihydrate ◽  
Salt Hydrates

scholarly journals Experimental Investigation on Mechanism of Latent Heat Reduction of Sodium Acetate Trihydrate Phase Change Materials

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 584
Author(s):  
Liu Wu ◽  
Jianqiang Li ◽  
Hui Wang ◽  
Ying Zhang ◽  
Shaowei Feng ◽  
...  
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Sodium Acetate ◽  
Lower Layer ◽  
Reduction Process ◽  
Imaging Method ◽  
Thermal Cycles ◽  
Sodium Acetate Trihydrate ◽  
Infrared Thermal Imaging ◽  
Acetate Trihydrate

Sodium acetate trihydrate (SAT) phase change material (PCM) has been well known for thermal energy storage due to its high latent heat and resource abundance. However, SAT suffers from severe latent heat reduction after heating and cooling cycles. Although a few of previous researches showed the reduction could be effectively inhibited by using thickeners, the mechanisms of the reduction process and thickeners’ inhibition have not been deeply explored till now. In this work, SAT modified by 5 wt.% nucleating agent of disodium hydrogen phosphate dodecahydrate (SAT/5 wt.% DSP) was prepared and 200 thermal cycles were carried out. The differential scanning calorimeter, Rheometer, X-ray diffractometry, and scanning electron microscope were used to investigate the extent of latent heat reduction, viscosity, phase composition and microstructure, respectively, and the infrared thermal imaging method was used to evaluate heat storage capacity. It was found that the latent heat of SAT/5 wt.% DSP dropped dramatically and the relative decrease in latent heat was measured to be 22.44%. The lower layer of SAT/5 wt.% DSP contained 24.1 wt.% CH3COONa, which was quantitatively consistent with the reduction extent. Furthermore, the phase change endothermic time of the lower layer was only 44.1% of that of the upper. SAT/5 wt.% DSP was further modified by 3 wt.% thickener of carboxymethyl cellulose (SAT/5 wt.% DSP/3 wt.% CMC) and endured 200 thermal cycles. The extent of the latent heat reduction of SAT/5 wt.% DSP/3 wt.% CMC was only 9.29%, and phase compositions were more homogeneous. The 3 wt.% CMC increased viscosity by 14 times, which effectively prevented the Stokes sedimentation velocity of CH3COONa in melts and inhibited the final macroscopic phase separation.

Sodium Acetate Trihydrate–Crystallization Inhibitor System for Seasonal Latent Heat Storage

2018 ◽  
Vol 144 (3) ◽  
pp. 04018022
Author(s):  
Lirong Yuan ◽  
Qifeng Ge ◽  
Hailu Fu ◽  
Guangming Jiang ◽  
Zhenxun Yu ◽  
...  
Keyword(s):  
Latent Heat ◽  
Sodium Acetate ◽  
Heat Storage ◽  
Sodium Acetate Trihydrate ◽  
Latent Heat Storage ◽  
Acetate Trihydrate ◽  
Crystallization Inhibitor ◽  
Inhibitor System
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