太阳能相变储能水箱释能性能的数值模拟  

Numerical analysis of the discharging performance of a solar energy storage tank containing PCM modules

作　　者：张永信[1] 李舒宏[1] 操恺[2] 李献亮[1] 顾维维[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]江苏省产品质量监督检验研究院,江苏南京210007

出　　处：《储能科学与技术》2013年第4期377-382,共6页Energy Storage Science and Technology

基　　金："十二五"国家科技支撑计划(2011BAJ03B05);江苏省科技支撑项目(BE2010747)

摘　　要：采用数值模拟软件FLUENT对含有相变储能模块的储热水箱(下文简称为相变储能水箱)和不含相变储能模块的普通水箱(直接进水)的释能工况进行数值模拟,并将模拟结果进行了对比。数值模拟结果表明水箱加入相变储能模块后,一方面相变储能模块的堆积起到了散流作用,减缓了进口水流造成的扰动;另一方面冷水进入水箱中通过相变储能模块缝隙时,相变储能模块对冷水有一定的加热作用。加入相变储能模块后,改善了释能过程的水箱内热分层效果,提高了储热水箱的释热总量。在流量为5L/min时,相变储能水箱的释能效率比普通水箱的释能效率高7%,但是随着流量的增大,相变储能水箱的释能效率逐渐降低。Numerical simulations were carried out on the discharging behaviour of a thermal energy storage water tank containing PCM modules and a tank containing only water. The modeling was done by using a CFD software package FLUENT. The results show that the cold inlet water can be heated by the PCM module during the discharging process and the PCM modules also act as a diffuser to reduce the disturbance caused by the inlet cold water. The PCM modules improve the thermal stratification of water during the discharging process. At a flow rate of 5 L/min, the discharging efficiency of the tank with PCM modules is 7% higher than that of the normal tank and the discharging efficiency of the water tank with PCM modules decreases with increasing water flow rate.

关 键 词：相变储能 PCM 数值模拟 释能效率 

分 类 号：TK02[动力工程及工程热物理]