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Super absorbent polymer as support for shape-stabilized composite phase change material containing Na2HPO4·12H2O–K2HPO4·3H2O eutectic hydrated salt
Solar Energy Materials and Solar Cells ( IF 6.9 ) Pub Date : 2021-08-16 , DOI: 10.1016/j.solmat.2021.111334
Ting Zou 1 , Tao Xu 1 , Hongzhi Cui 2 , Hongfei Tao 3 , Huijin Xu 4 , Xiaoqing Zhou 1 , Qiliang Chen 1 , Jiayu Chen 5 , Gongsheng Huang 5 , Yongjun Sun 6
Affiliation  

Solar energy radiation during the midday could causes the internal temperature of building rising, thus resulting in a significant source of power consumption to run air conditioner devices for thermal comfort environment. A growing interest developed in phase change materials (PCMs) applied in building envelope owing to the prevailing energy challenges. A new type of shape-stabilized composite phase change material (CPCM) was developed by introducing a novel Na2HPO4·12H2O–K2HPO4·3H2O (DSP-PPDT) eutectic hydrated salt into super absorbent polymer (SAP), which was characterized by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD), Scanning electron microscope (SEM). Results indicated that DSP-PPDT eutectic hydrated salts in various ratios all can be formed, among which DSP-PPDT eutectic hydrated salt with the mass fraction of PPDT at 25% had a melting temperature of 24.26 °C, making it suitable for building envelope. The results of cooling tests suggested that 2% of Na2SiO3·9H2O nucleating agent could reduce the supercooling degree of the eutectic hydrated salt to 0.79 °C. The modified eutectic hydrated salt could be stabilized in the network structure of SAP at a mass fraction of 12% through physical interaction without leakage, which melted at 24.13 °C with the enthalpy of 172.7 J/g and had enhanced thermal stability, good thermal reliability at 100 thermal cycles as well as low thermal conductivity of 0.474 W/(m·K). The good thermal performances of CPCM make it a promising candidate applied in building envelope.



中文翻译:

高吸水性聚合物作为含 Na2HPO4·12H2O–K2HPO4·3H2O 共晶水合盐的形状稳定复合相变材料的载体

正午的太阳能辐射会导致建筑物内部温度升高,从而成为运行空调设备以实现热舒适环境的重要电力消耗来源。由于普遍存在的能源挑战,人们对应用于建筑围护结构的相变材料 (PCM) 越来越感兴趣。通过引入新型Na 2 HPO 4 ·12H 2 O-K 2 HPO 4 ·3H 2开发了一种新型形状稳定复合相变材料(CPCM)O(DSP-PPDT)共晶水合盐转化为高吸水性聚合物(SAP),通过差示扫描量热法(DSC)、傅里叶变换红外光谱(FT-IR)和X射线衍射(XRD)、扫描电子显微镜(扫描电镜)。结果表明,DSP-PPDT共晶水合盐可以形成各种比例,其中PPDT质量分数为25%的DSP-PPDT共晶水合盐的熔点为24.26℃,适用于建筑围护结构。冷却试验结果表明,2%的Na 2 SiO 3 ·9H 2O成核剂可以将共晶水合盐的过冷度降低到0.79℃。改性共晶水合盐可以通过物理相互作用以12%的质量分数稳定在SAP的网络结构中而不会泄漏,在24.13°C熔化,焓为172.7 J/g,具有增强的热稳定性,良好的热可靠性在 100 次热循环以及 0.474 W/(m·K) 的低热导率下。CPCM 良好的热性能使其成为应用于建筑围护结构的有希望的候选者。

更新日期:2021-08-16
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