梯级相变蓄热装置蓄放热性能模拟研究  

Numerical simulation on the thermal performance of the cascade stage latent thermal storage system with the various phase change material

作　　者：宗弘盛 杨兆晟 张群力[1] 张世红[1] Zong Hongsheng;Yang Zhaosheng;Zhang Qunli;Zhang Shihong(Beijing Key Lab of Heating,Gas Supply,Ventilating and Air Conditioning Engineering,Beijing University of Civil Engineering and Architecture 1,Beijing 100044,China)

机构地区：[1]北京建筑大学供热供燃气通风与空调北京市重点实验室,北京100044

出　　处：《可再生能源》2021年第5期618-625,共8页Renewable Energy Resources

基　　金：北京建筑大学2020年度研究生创新项目(31081020003);北京市高校基本科研业务费专项资金项目(X20027;X20026)。

摘　　要：文章设计了包含多种蓄热材料的梯级相变蓄热装置,建立了该装置蓄放热过程的数学模型,模拟并对比了单级、梯级相变蓄热装置在相同工况下的蓄热量、有效能利用率、液相率、传热热流密度等性能的差异。在相同工况下,与单级硬脂酸相变蓄热装置相比,梯级相变蓄热装置的蓄热量提高16.9%,有效能利用率提高10.1%,蓄热/放热平均热流密度分别提高97.6%,64.9%,蓄热/放热用时分别缩短50.5%和39.2%。梯级相变蓄热装置的蓄热用时随传热流体进口流速的增加呈现先下降后上升的趋势。梯级相变蓄热装置的蓄热用时长短受传热流体进口流速工况的影响。A cascade stage latent thermal storage system with various phase change materials is designed.The numerical model of the process of the dynamic thermal performance of the singlestage and the cascade stage latent thermal storage system are set up.The heat storage capacity,the heat recovery efficiency,the liquid phase fraction,and the heat transfer flux on the same working conditions are simulated.Compared with the single-stage latent thermal storage system with stearic acid on the same work condition,the heat storage capacity,the heat recovery efficiency,the average heat flux density during heat charging and discharging process of the cascade latent thermal storage system are increased by 16.9%,10.1%,97.6%and 64.9%respectively;however,their heat charging and discharging period is shortened by 50.5%and 39.2%respectively.With the inlet velocity of heat transfer fluid increases,the heat charging period of the cascade stage latent thermal storage system decreases firstly and then rises.The heat charging period of the cascade stage latent thermal storage system is affected by the inlet velocity of the heat transfer fluid.

关 键 词：梯级相变蓄热 传热 数值仿真 相变材料 蓄热 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]