金属复合梯级相变蓄热炕性能的实验研究

Experimental Research on the Performance of Metal Composite Cascade Pcms Thermal Storage Kang

为推进我国北方农村地区冬季清洁供暖,同时针对单级相变材料导热性能较差,蓄热效果较低的问题,提出了1种以太阳能为热源,3种不同熔点石蜡为相变材料的金属梯级相变蓄热炕。在3种不同供水温度下通过实验分析炕体热性能,实验结果表明:泡沫铝复合梯级相变蓄热炕的最佳供水温度为38.0℃,在此供水温度下,其睡眠阶段睡眠平均温度为28.86℃,比蜂窝铝复合梯级相变蓄热炕提高了8%,比纯石蜡梯级相变蓄热炕提高了13%,比纯石蜡单级相变蓄热炕提高了19%;其睡眠阶段睡眠温度标准差最大值为0.53℃,而纯石蜡梯级相变蓄热炕为0.50℃,二者相差很小。在提高睡眠温度的同时,也保障了睡眠区域温度的均匀性。

In order to promote clean heating in winter in rural areas in northern China,and address the poor thermal conductivity and low thermal storage effect of single-stage PCMs(phase change materials),a metal cascade PCMs thermal storage Kang(Chinese heated brick bed)using solar energy as the heat source and three paraffin waxes with different melting points as PCMs was proposed.The thermal performance of the Kang body was analyzed through experiments under three different water supply temperatures.The experimental results show that the optimal water supply temperature of the foam aluminum composite cascade PCMs thermal storage Kang is 38.0℃.At this water supply temperature,the average sleep temperature during sleep is at 28.86℃,8%higher than the honeycomb aluminum composite cascade PCMs thermal storage Kang,13%higher than the pure paraffin cascade PCMs thermal storage Kang,and 19%higher than the pure paraffin single-stage PCMs thermal storage Kang.The maximum standard deviation of the sleep temperature during sleep is 0.53℃,while the pure paraffin cascade PCMs thermal storage Kang is 0.50℃,with a narrow difference between the two.While raising the sleeping temperature,it also guarantees the uniformity of the temperature in the sleeping area.