相变板储热水箱充/放热速率及经济性分析  

Charging/discharging rates and economic analysis of a PCM plate heat storage tank

作　　者：徐政凯 陈启阳 陈健勇[1] 陈颖 XU Zhengkai;CHEN Qiyang;CHEN Jiangyong;CHEN Ying(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006

出　　处：《热科学与技术》2024年第4期413-420,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金区域联合基金资助项目(U20A20299)

摘　　要：将相变材料板按照一定结构排列在水箱中,制成相变储热水箱。通过实验,研究了进口流量和进水温度对相变板储热水箱充热和放热性能的影响,监测了相变材料的温度变化情况,采用了雷诺数(Reynolds,Re)和史蒂芬数(Stefan,Ste)分析储热水箱的充/放热速率,并进一步对相变储热装置进行了经济性分析。结果表明:设置不同的进口水温和流量,可调控充/放热速率,满足不同用户侧的需求。在充热过程中,当Ste为0.101时,Re从37.37增加到70.59,平均充热功率增大59.23%。Re为70.59时,Ste从0.075增加到0.101,平均充热功率增大34.44%。不同位置的相变材料温度基本一致。在放热过程中,储热水箱内Re和Ste的减小均能延长供热时长。Ste为0.163时,Re从70.59减小到37.37,有效放热时间增加了135.65%。相变材料在高度方向温度变化有明显的差异。经济性分析表明,在广州市和深圳市采用空气源热泵结合相变储热装置提供热水能够在4 a内回收成本,可为相变储热装置在生活热水中应用提供参考。A heat storage water tank is constructed by arranging the phase change material(PCM) plates with a certain layout. Effects of the inlet flow rates and inlet temperatures on the charging and discharging performance of the heat storage tank device are studied experimentally with an attention paid to the variations of PCM temperature. Reynolds number(Re) and Stefan number(Ste) are used to analyze the charging/releasing rate of the heat storage tank, and economic analyses of the heat storage device are further carried out. The results show that the charging/discharging rate can be regulated by setting different inlet water temperatures and flow rates in order to meet the different needs of the users. During charging process, when Ste is 0.101, Re increases from 37.37 to 70.59, and the average charging power is increased by 59.23%. When Re is 70.59 and Ste increases from 0.075 to 0.101, the average charging power increases by 34.44%. The PCM temperatures at different positions are generally the same. Regarding the discharging process, the discharging time can be prolonged by reducing Re and Ste. When Ste is 0.163 and Re decreases from 70.59 to 37.37, the effective discharging time increases by 135.65%. The PCM temperatures are significantly differentiated vertically. The economic analysis shows that the cost of PCM heat storage device combined with air source heat pump can be recovered within 4 a in Guangzhou and Shenzhen, which can provide a reference for the application of the PCM heat storage device in domestic hot water.

关 键 词：相变材料板 储热水箱 充/放热性能 经济性分析 

分 类 号：TK02[动力工程及工程热物理]