电力科技与环保2025，Vol.41Issue(3)：477-487,11.DOI:10.19944/j.eptep.1674-8069.2025.03.012
新型有机脂肪酸复合相变储能材料及应用前景
Novel organic fatty acid composite phase change energy storage materials and application prospects
摘要
Abstract
[Objective]In response to the surge of emergency cooling demand of combined heat and power(CHP)system under peak load or extreme environment,the low energy storage density of traditional water storage technology,and the insufficient thermal conductivity of organic phase change materials,the present study is aimed at developing a composite phase change material(CPCM)with suitable phase change temperature,high latent heat,and high thermal conductivity in order to enhance the thermal management efficiency and energy utilization of the system.[Methods]Using octanoic acid(OA)and lauric acid(LA)as substrates,we calculated the binary eutectic ratios based on Schrader's equation theory,and screened the eutectic matrix suitable for the temperature range of 5～8℃by combining the step-cooling curve method,the differential scanning calorimetry(DSC)method,and the melting-solidification cycle experiments;and we further used the adsorption property of expanded graphite(EG)to prepare the OA-LA/EG composites,and systematically analyzed their phase change temperature and thermal conductivity.Further,the porous structure of expanded graphite(EG)was used to prepare OA-LA/EG composites,and the phase transition temperature,latent heat,thermal conductivity and cycling stability were systematically analyzed.[Results]The results show that the phase transition temperature of the eutectic matrix with 80:20 OA-LA mass ratio is 5.4℃,and the latent heat is 158.8 J/g.With the addition of 12 wt%EG,the phase transition temperature of the composites is stabilized at 5.2℃,and the latent heat is 145.8 J/g,and the thermal conductivity is increased to 2.23 W/(m·K),which is 6 times higher than that of the pure OA-LA,and the supercooling phenomenon has been suppressed.(supercooling degree≤0.2℃).After 1000 cycles,the latent heat decay rate is only 13.2%,showing excellent cycling stability.[Conclusion]OA-LA/EG composites provide an efficient emergency cooling solution for cogeneration systems by virtue of their adaptable phase change temperature,high energy storage density and fast thermal response,which is of great value for improving the stability of the system and the efficiency of the comprehensive use of energy.关键词
有机脂肪酸/膨胀石墨/相变温度/导热率/复合材料Key words
organic fatty acid/expanded graphite/phase change temperature/thermal conductivity/composite material分类
能源科技引用本文复制引用
倪明龙,乐小龙,陈振乾,王磊,施娟,刘明涛,盛帮明,李晓琪,李志远..新型有机脂肪酸复合相变储能材料及应用前景[J].电力科技与环保,2025,41(3):477-487,11.基金项目
中国电力工程顾问集团有限公司科技项目(DG2-A02-2022) （DG2-A02-2022）
