Experimental study of cooling discharging characteristics of the energy storage system filled with MPCM slurry

被引：0

作者：

Bu L. ^{[1
]}

Qu Z. ^{[2
]}

Xu H. ^{[1
]}

Jin M. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai

[2] Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 08期

关键词：

Convection; Cooling discharging; Heat transfer; Microcapsule slurry; Phase change; Thermal energy storage system;

D O I：

10.11949/0438-1157.20201693

中图分类号：

学科分类号：

摘要：

Taking advantage of the fixed-temperature energy storage characteristics of phase change materials, a latent heat energy storage system with water as the heat exchange fluid and microencapsulated phase change material (MPCM) slurry as the energy storage medium was built. In this experimental system, water worked as heat transfer fluid and MPCM slurry acted as the energy storage medium. The cooling discharging characteristics of this system were characterized by the cooling rate, phase transformation completion rate, volumetric thermal release capacity and convective heat transfer coefficient. Through the comparisons between this latent thermal energy storage system and the sensible thermal energy storage system using pure water as the working medium, the influences of different flow rate of circulating water and stirring rate on the cooling discharging performance of this system was analyzed. The results indicated that the phase transformation of MPCM mainly occurred in the range of 17-19℃, and the phase transformation completion rate is approximately 90% when the slurry temperature was 20℃. The cooling discharging rate increased with the increasing the circulating water flow rate. When the flow rate of circulating water is 6 L·min-1, the maximum cooling discharging rate of MPCM slurry reached 1.52 kW in the phase transition region, which is 70% higher than that of the sensible thermal energy storage system. In the range of 0-200 r·min-1, the volumetric thermal release capacity and convective heat transfer coefficient of MPCM slurry can be increased by increasing the stirring rate. At the stirring rate of 200 r·min-1, the volumetric thermal release capacity and convective heat transfer coefficient of MPCM slurry are 73.86 MJ·m-3 and 2176 W·m-2·K-1, respectively, which are 1.66 and 1.87 times higher than that of sensible thermal storage system. © 2021, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：4064 / 4072

页数：8

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