颗粒型固-固相变材料堆积床蓄热与放热实验

对季戊四醇的固体颗粒堆积床相变蓄热和放热特性进行了实验研究.实验结果表明:在开始加热时,空气进口段堆积床的温度上升比较快,随着蓄热的进行,温度升高减慢;当季戊四醇的温度达到相变温度时,出口温度基本保持不变.当开始放热时,堆积床进口处蓄热材料的温度下降较剧烈,后段温度下降很缓慢.随着时间的增加,蓄热床内各点的温度均下降,并出现中段温度高、两侧温度低的现象.在实验中观察到明显的升华现象.

Experimental Investigations for Thermal Storage and Rejection of Solid-solid Phase-Change Materials in the Packing Bed

The authors conduct the experimental investigations for the heat-stored and heat-rejected behaviors of Pentaerythritol solid-solid phase-change particles in the packed bed. The experimental results show that at the beginning of heating, the temperature at the inlet of packed bed goes up quickly. But the rise of the temperature slows down along with the process of heat-stored. When the temperature of Pentaerythritol reaches to its phase-change temperature, the outlet temperature keeps almost constant. As the heat-rejected process begins, the temperature of the heat-stored materials decreases sharply at the inlet of packed bed, and drops very slowly at the posterior section of packed bed. The temperature of each spot in packed bed drops with increasing time, and besides, the temperature in the middle section is high and is low at the two sides of the test section. It spends nearly 4 hours to reject well all the thermal storage in the packed bed. In experiments, the sublimation phenomena can be obviously observed. After experiments, a portion of the heat-stored material has been lost.