添加物对石蜡相变螺旋盘管蓄热器蓄热和放热性能的影响

Effect of additive on thermal energy stored and discharged performance of wax phase change thermal storage with spiral pipe

对以石蜡为相变材料的螺旋盘管蓄热器的蓄热和放热性能进行了实验研究 ,探讨了在石蜡中添加铜粉、硅粉和不锈钢丝带对石蜡螺旋盘管蓄热器蓄热和放热性能的影响。结果表明 :在蓄热过程中 ,随着加热时间的增加 ,蓄热器内的温度分布不均匀性逐渐增大 ;纯石蜡蓄热器内温度分布不均匀性最为严重 ;插入不锈钢丝带的蓄热器内温度分布最均匀。在放热过程中 ,纯石蜡蓄热器的出口水温下降最快 ;而石蜡加不锈钢丝带的蓄热器出口水温最高。

The thermal energy storing and discharging performances of wax phase change thermal storage with spiral pipe were studied experimentally in this paper. For increasing the effective thermal conductivity of wax, the copper powder, silicon powder, and stainless steel ribbon were used as additive in wax respectively. The effect of the additives on the thermal energy storing and discharging performance of thermal storage were discussed. The experimental results show that during thermal energy storage, the temperature profile in thermal storage becomes more uneven when heat was inputted continuously. During thermal energy storage and discharging, the thermal storage with wax and stainless steel ribbon has the most uniform temperature profile; followed with wax and silicon powder, wax and copper powder, and wax. The water temperature at the outlet of spiral pipe of thermal storage with wax drops most rapidly in these thermal storages with various additives. For a specific thermal energy discharging time, the thermal storage with stainless steel ribbon has the highest water temperature at the outlet of spiral pipe in the process of thermal energy discharging, the second is the one with wax and silicon powder, and the third is the one with wax and copper powder.