基于圆柱形单元的储热装置放热实验研究

EXPERIMENTAL RESEARCH ON HEAT RELEASE OF HEAT STORAGE DEVICE BASED ON CYLINDRICAL UNIT

蓄热水箱作为太阳能供暖系统的重要核心设备,其性能直接影响着储能系统的整体运行效率。设计一种基于圆柱形相变单元的相变储热装置,并搭建相变蓄热水箱性能测试平台,通过单一控制变量法得到储热装置放热过程的温度变化曲线。研究表明:对于空间一定的储热装置,在等质量相变材料(PCM)时,相变单元的直径对装置放热速率的影响较大;相变单元之间的间距对装置放热速率的影响较小;当增大换热流体(HTF)的入口流量及降低HTF入口温度时,能大大减少储热装置的放热时间,提高储热装置的整体性能。

As an important core equipment in the solar heating system,the performance of the hot water storage tank directly affects the overall operating efficiency of the energy storage system. In this paper,a phase-change heat storage device with a group of cylindrical phase-change unit is designed,and a phase-change hot water storage tank performance test platform is built. The temperature change curve of the heat storage device in heat release process is obtained through the single control variable method. Studies show that for a heat storage device with a certain space,when the mass of phase change material(PCM)is equal,the diameter of the phase change unit has little effect on the heat release rate of the device;the distance between the phase change units has a great impact on the device The effect of heat release rate is small;when the inlet flow rate of heat transfer fluid(HTF)is increased and the HTF inlet temperature is decreased,the heat release time of the heat storage device can be greatly reduced,and the overall performance of the heat storage device can be improved.