圆柱形相变储热器热损失的试验研究

Experimental Study of Heat Loss on Cylindrical Phase Change Thermal Storage

相变储热有着密度高、体积小、质量轻,蓄放热过程中温度波动小等优点,在太阳能热利用、工业余热回收、采暖及空调等领域有着较为广泛的应用。本文利用相变储热试验平台模拟储热器的工作原理,对储热器不工作状态下内部和外部温度进行监测,发现相变储热器在非稳态散热时具有比较明显的凝固放热现象,而且通过顶面的热损失严重;对储热器热损失进行了分类,对储热器热损失系数这一关键数据进行探讨;最后,在试验和理论分析基础上提出增大上部保温层厚度、加强进出口部位的保温、减小管径和增加阀门可减小储热器通过顶面的热损失。

Phase change heat storage has the Advantage of high density, small size, light weight, storage exothermic process tem- perature fluctuations, and it has wider application, in solar thermal, industrial waste heat recovery, heating and air-conditioning and other fields. The phase change thermal storage experiment platform was built, the working principle of thermal reservoir was simu- lated, the internal and external temperature of the thermal storage under not working status was monitored, The result showed phase change thermal storage has obvious solidified exothermic phenomena under unsteady state cooling. Classification heat reser- voir heat loss, discusses the critical data-thermal storage heat loss coefficient;Finally, made recommendations that increasing the thickness of the upper layer of insulation, strengthen import and export parts of insulation, reducing the diameter and increase valve could reduce heat loss from upper layer on the basis of experimental and theoretical analysis.