摘要
制作了四面绝热的泡沫金属/石蜡复合相变储热装置,在不同功率密度下分别对存在自然对流和不存在自然对流两种情况下装置的固-液相变储热过程进行了对比实验研究。整理绘制了在不同加热功率下的温度-时间曲线,并采用常热流边界条件下半无限大物体熔化过程的数学解对实验件受热面温度进行了模拟,结果表明在大功率密度情况下从底部加热会形成较为明显的自然对流,并且自然对流的存在增强了储热装置的内部传热,储热效率提高为原来的1.38倍,在5000W/m2功率下热源最大温度比原来低26℃。
A phase change thermal storage device with Metal Foam/Paraffin Wax was developed which has insulated walls around and the experiment on the device performance was conducted at different power density under the condition with and without natural convection, respectively. The temperature variation with time under different heating power was obtained and a semi-infinite model with the second kind boundary conditions was used to simulate the bottom temperature of the tested vessel. The experimental results show that the obvious natural convection occurred in the melting part when the tested vessel was heated from below, and the heat- transfer capability and the thermal storage efficiency of the thermal storage device improved significantly because of the effect of convection. The thermal storage efficiency with the effect of convection was 38% greater than that without the effect of convection, and the maximum bottom temperature decreased by about 26°C at 5000W/m^2.
出处
《制冷学报》
CAS
CSCD
北大核心
2009年第1期1-6,共6页
Journal of Refrigeration
基金
航空科学基金资助项目(2004ZE51048)
教育部博士点基金资助项目(20040006012)
"凡舟"青年科研基金资助项目(20070505)资助~~
关键词
工程热物理
储能技术
泡沫金属
相变材料
自然对流
储能效率
Engineering thermophysics
Energy storage technique
Metal foam
PCM
Natural convection
Thermal storage efficiency
作者简介
E-mail： zhangtao@ase.buaa.edu.cn
