基于太阳能低温集热蓄热的相变流体制备及性能研究

基于前期对相变流体的实验研究,选定了以质量分数为20%的烃类相变流体作为基液,制备了多组以TiO2纳米颗粒为添加剂,SDBS为分散剂的添加纳米颗粒的相变流体。通过改变纳米颗粒质量分数、粒径以及分散剂质量分数,分析不同相变流体随温度变化的热物性及稳定性,最终得出烃类相变流体中分别添加质量分数为0.1%的20 nm TiO2纳米颗粒及质量分数为0.1%的SDBS分散剂,其热物性及稳定性最佳。为添加纳米颗粒的相变流体的制备及其在太阳能低温集热蓄热领域的应用提供了参考。

Thermal properties test of phase change slurry added titanium dioxide nanoparticles and dispersants

Based on previous experimental studies on phase change slurry, hydrocarbon phase change slurry with mass fraction of 30% were selected as base liquids, and several groups of phase change fluids with nanoparticles and SDBS were prepared as additives and dispersants. By changing the mass fraction, particle size of nanoparticles and mass fraction of dispersant, the thermophysical properties and stability of different phase change slurry varying with temperature were analyzed. It was concluded that the thermal properties and stability of hydrocarbon phase change fluids were best when adding 20 nm titanium dioxide nanoparticles with mass fraction of 0.1% and SDBS dispersant with mass fraction of 0.1%. It provided a reference for the preparation of phase change slurry with nanoparticles and their application in the field of solar low-temperature heat storage.