摘要
针对冷链物流冷冻温区应用场合,提出将三羟甲基丙烷、氯化铵、水组成三元复合相变蓄冷材料,利用差示扫描量热仪筛选得到了性能较为优异的复合材料,其质量比为1∶2∶7,相变温度为-19.4℃,潜热焓为250.5 kJ/kg。实验研究了降温速率、冷却介质温度、容器尺寸和纳米颗粒(Al_(2)O_(3),Fe_(2)O_(3),TiO_(2))对该材料过冷度的影响规律。结果表明:当降温速率从1.89℃/min逐渐减小至0.47℃/min时,过冷度降低幅度为40.9%;冷却介质温度从-30℃升高到-24℃的过程中,过冷度最大降低幅度为48.5%;容器直径从10 mm增大到20 mm的过程中,过冷度降低幅度达到39.5%;TiO_(2)纳米颗粒质量分数在0.4%时,过冷度降低效果最佳。由此可见,在一定范围内减小降温速率,增大冷却介质温度和容器尺寸,添加一定量的TiO_(2)纳米颗粒,可有效降低相变蓄冷材料的过冷度。
Aiming at the application of the cold-chain logistics in freezing temperature area,a composite phase change material for cold storage which is composed of trimethylolpropane,ammonium chloride and H2O was proposed.The composite phase change material with excellent thermal performance was developed by using differential scanning calorimetry,which has a mass ratio of 1∶2∶7 with phase-change temperature of-19.4℃and latent heat enthalpy of 250.5 kJ/kg.Then,the effects of cooling rate,temperature of cooling medium,vessel diameter and different nanoparticles(Al_(2)O_(3),Fe_(2)O_(3),TiO_(2))on the supercooling degree were experimentally investigated.The results show that when the cooling rate decreases from 1.89℃/min to 0.47℃/min,the reduction range of supercooling degree is 40.9%.When the temperature of cooling medium increases from-30℃to-24℃,the maximum reduction range of supercooling degree is 48.5%.When the vessel diameter increases from 10 mm to 20 mm,the reduction range of supercooling degree is 39.5%.When the concentration of TiO_(2) is 0.4%,the optimum effect on reducing supercooling degree is achieved.Therefore,the supercooling degree can be effectively reduced by reducing the cooling rate,increasing the temperature of the cooling medium and the size of the vessel,and adding a certain amount of TiO_(2) nanoparticles.
作者
周志钢
朱群东
武卫东
ZHOU Zhigang;ZHU Qundong;WU Weidong(Shanghai General Cooling Technology Co.,Ltd.,Shanghai 201201,China;School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《上海理工大学学报》
CAS
CSCD
北大核心
2021年第3期241-248,共8页
Journal of University of Shanghai For Science and Technology
基金
上海市科促会联盟计划项目(LM201709)。
关键词
相变材料
复合
蓄冷
过冷度
纳米颗粒
phase change material
composite
cold storage
supercooling degree
nanoparticles
作者简介
第一作者:周志钢(1976-),男,博士.研究方向:制冷设备及相变蓄能技术.E-mail:stephen.zhou@vacooler.com;通信作者:武卫东(1973-),男,教授.研究方向:蓄冷材料及应用.E-mail:usstwwd@163.com。
