Zhang Qi, Li Yinlei, Song Jun, Zhang XueLing, Wu Xuehong, Liu Chongyang, Li Yanfang
College of Energy and Power Engineering, Zhengzhou University of Light Industry Zhengzhou 450002 China
RSC Adv. 2023 Jun 5;13(25):16837-16849. doi: 10.1039/d3ra01118f.
It is important to improve phase change materials (PCMs) with appropriate temperature and excessive latent heat to accelerate the application of latent heat energy storage technology in solar energy storage systems. In this paper, the eutectic salt of NHAl(SO)·12HO (AASD) and MgSO·7HO (MSH) was prepared and the performance was studied. The DSC results show that the optimum content of AASD in the binary eutectic salt is 55 wt%, the melting point was 76.4 °C, and the latent heat is up to 189.4 J g, which is suitable for solar power storage systems. Four nucleating agents (KAl(SO)·12HO, MgCl·6HO, CaCl·2HO, CaF) and two thickening agents (sodium alginate, soluble starch) are added to the mixture in varying proportions to improve its supercooling. The best combination system was 2.0 wt% KAl(SO)·12HO/1.0 wt% sodium alginate with a supercooling degree of 24.3 °C. After thermal cycling tests, the best formulation of the AASD-MSH eutectic salt phase change material was determined to be 1.0 wt% CaCl·2HO/1.0 wt% soluble starch. The latent heat was 176.4 J g and the melting point was 76.3 °C. The supercooling was still lower than 30 °C after 50 thermal cycles, which served as a benchmark for the next investigation.
改进具有合适温度和高潜热的相变材料（PCM）对于加速潜热储能技术在太阳能储能系统中的应用很重要。本文制备了NHAl(SO)·12HO（AASD）和MgSO·7HO（MSH）的低共熔盐并研究了其性能。差示扫描量热法（DSC）结果表明，二元低共熔盐中AASD的最佳含量为55重量%，熔点为76.4℃，潜热高达189.4焦耳/克，适用于太阳能储能系统。将四种成核剂（KAl(SO)·12HO、MgCl·6HO、CaCl·2HO、CaF）和两种增稠剂（海藻酸钠、可溶性淀粉）按不同比例添加到混合物中以改善其过冷度。最佳组合体系是2.0重量%KAl(SO)·12HO/1.0重量%海藻酸钠，过冷度为24.3℃。经过热循环测试后，确定AASD-MSH低共熔盐相变材料的最佳配方为1.0重量%CaCl·2HO/1.0重量%可溶性淀粉。潜热为176.4焦耳/克，熔点为76.3℃。经过50次热循环后过冷度仍低于30℃，这为下一步研究提供了基准。
