变比例相变级联堆积床的蓄热特性研究  

Study on Heat Storage Characteristics of Variable Proportion Phase Change Cascade Packed Bed

作　　者：丛钰 曹丽华[1] 孟雨欣 张仲彬[1] CONG Yu;CAO Lihua;MENG Yuxin;ZHANG Zhongbin(College of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林省吉林132012

出　　处：《动力工程学报》2023年第3期283-291,共9页Journal of Chinese Society of Power Engineering

摘　　要：为了探究级联堆积床内不同相变材料(PCM)的比例对热性能的影响,共建立7种堆积比的相变胶囊蓄热堆积床物理模型,通过数值模拟方法监测换热流体和PCM温度等指标,并对比分析了蓄热量、?效率、蓄热速率和蓄热速率密度等表征堆积床热性能的指标。结果表明:随着高熔点相变材料占比的增加,堆积床可以获得较高的?效率,但其他指标均随着低熔点相变材料占比的增加而升高;与均分的级联堆积床相比,按熔点从低至高,PCM占比呈梯级升高或降低的级联堆积床的蓄热品质及蓄热效率提升显著,证明合理优化级联堆积床内相变材料的比例可有效提升级联堆积床的热性能。To investigate the impacts of different phase change materials(PCM)ratios in the cascade packed bed on the thermal performance,seven kinds of physical models of phase change capsule thermal accumulation beds with different packing ratios were established.Via monitoring the heat exchange fluid and PCM temperature using numerical simulation,other indicators acquired from calculation were the heat storage,the exergy efficiency,the heat storage rate,and the heat storage rate density which were compared with relative indicators to characterize the thermal performance of the packed bed.Results show that with the increase of the proportion of high melting point PCM,the exergy efficiency of the packed bed increases.However,all other indicators increase with the increase of the proportion of low melting point PCM.In addition,the cascade packed bed with a stepped increase(or decrease)in the percentage of PCM from low to high melting point has a significant improvement in thermal storage quality(thermal storage efficiency)compared to the evenly divided cascade packed bed,which proves that the reasonable optimized ratio of PCM in the cascade packed bed can effectively improve its thermal performance.

关 键 词：相变蓄热 级联堆积床 堆积比 胶囊 数值模拟 

分 类 号：TM85[电气工程—高电压与绝缘技术]