摘要
基于节能减排的重要性,针对Na_2SO_4·10H_2O基相变材料相变过程中液相泄露和长期使用的热稳定性问题,采用直接浸渍的方法将其封装入不同载体(Si O_2气凝胶、X型分子筛、膨胀珍珠岩、活性炭和硅藻土)中,成功制备了不同载体的定形相变材料。通过SEM、XRD、DSC等表征方法,测定了饱和吸附时各自的相变材料占比分别为80.0%、82.2%、76.9%、89.2%及60.6%;并且从热性能、机械性能、成本等方面综合对比了不同载体的性能,发现膨胀珍珠岩(EP)是性价比最优的载体材料。进一步对Na_2SO_4·10H_2O/EP复合相变材料进行了熔冻循环实验测试,经过100次循环实验,热值损耗保持在15%以内,过冷度稳定在10℃以内,热稳定性良好。
Energy conservation has great significance in today~ society. In this paper, Na2SO4 · 10H20 was selected as a phase change material （PCM） which was encapsulated into different carriers, such as SiO2 aerogels, X-type molecular sieves, expanded perlite, activated carbon and diatomite by using direct impregnation method for preventing the leakage and guaranteeing the long-term thermal stability during the phase transition. Test results of SEM, DSC and XRD show that the percentage of PCM in the different adsorbents is 80.0%, 82.2% , 76.9% , 89.2% and 60.6% respectively after saturation adsorption. Compared with other carriers the expanded perlite （EP） is the most cost-effective carrier material in terms of thermal properties, mechanical properties and cost. The Na2SO4·10H20/EP composite phase change material was further detected for the thermal cycle experiment. After 100 cycles, its calorific value loss is less than 15% , and the undercooling is within 10 ℃, indicating that the Na2SO4 · 10H20/ EP has a good thermal stability.
出处
《人工晶体学报》
CSCD
北大核心
2017年第12期2374-2379,2385,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(51672025,51572020,51372019)
山西省科技支撑计划(MC2016-03)
