泡沫铝-石蜡复合相变材料的蓄放热性能研究

Thermal Storage and Release Properties of Aluminum Foam - Paraffin Composite Phase Change Materials

采用渗流法制备的泡沫铝制作了泡沫铝-石蜡复合相变材料,对其蓄、放热性能进行了研究。结果表明:(1)复合相变材料与水的体积比为1:4、泡沫铝骨架孔隙率分别为54.81%、60.52%、64.37%、69.74%时,复合相变材料从24℃升高到66℃所需的时间分别为190s、305s、380s、395s;66℃的复合相变材料放入24℃的水中,放热时间分别为270s、355s、540s、600s,水温升高值分别为8.2℃、8.7℃、9.4℃、10.1℃;(2)对比泡沫铝骨架孔隙率60.52%的复合相变材料、泡沫铝和石蜡的蓄、放热过程,其蓄、放热时间分别为305s、60s、870s和355s、30s、1470s;(3)泡沫铝骨架孔隙率为69.74%-54.81%的复合相变材料,其理论等效导热系数在61.16 W·m-1·k-1-91.40W·m-1·k-1之间。

Aluminum foam- Paraffin Composite Phase Change Materials （APCPCMs） were fabricated by infiltrated aluminum foam and paraffin, and the thermal storage and thermal release properties of the com- posites have been studied. The results are shown as followings. （1） When the volume ratio between APCPCM and water is 1：4, the time for the temperature changing from24℃ to 66℃ of the APCPCMs with aluminum foam porosity being 54.81% ,60.52% ,64.37% and 69, 74%, are 190s, 305s, 380s and 395s respectively. The thermal release time of these APCPCMs are 270s, 355s, 540s and 600s after putting them into 24℃ water, and resulting a water temperature increasing 8.2℃, 8.7℃, 9.4℃ and 10. 1℃ respectively. （2） APCPCM with aluminum foam porosity 60.52% is compared with aluminum foam and paraffin, the thermal storage time are 305s, 60s, 870s, and the thermal release time are 355s, 30s, 1470s respectively. （3） Equivalent thermal conductivity coefficient of the APCPCMs with aluminum foamporosity changing form 69.74% to 54.81% is between 61.16 W· m-1· k-1 -91.40W· m-1· k-1