新型相变材料十二水磷酸氢二钠/石墨烯微片在相变墙体中的应用

The Application of Na₂HPO₄·12H₂O/GN as a Promising Phase Change Material for the PCM Wall

伴随着全球能源日益紧张,能源如何得到有效利用成为当前研究的热点。无机水合盐相变材料(PCM)作为一种性能优良的储热材料被广泛研究。本文选用了相变潜热大,热学性能稳定的十二水磷酸氢二钠(Na2HPO4?12H2O)作为研究对象。通过添加1%的石墨烯微片(GN)降低十二水磷酸氢二钠的过冷度,同时提高导热效率。使用差热扫描量热仪对Na2HPO4?12H2O/GN复合材料进行了热学性能测试。随后将制成的Na2HPO4?12H2O/GN复合材料作为相变层添加到墙体中进行模拟实验。通过相应的实验分析,比较了不同条件下PCM墙体与普通墙体的温度调节情况。结果表明,PCM墙体的冷速比普通墙体低39.41%,热速比普通墙体低27.83%。试验结果表明,采用Na2HPO4?12H2O/GN作为相变储热层的墙体可以有效调节室内温度。

In this paper, sodium phosphate dibasic dodecahydrate (Na2HPO4?12H2O) is selected as phase change material (PCM) characterized with considerable thermal latent heat and consistent heat storage performance. 1 wt% graphene nanoplatelets (GN) is added in the system to improve the thermal efficiency and reduce the supercooling degree of Na2HPO4?12H2O. Subsequent to the addi-tion of Na2HPO4?12H2O/GN composite as phase change material layer, the PCM wall is built. The corresponding experimental analysis is conducted to compare the temperature adjustment of PCM wall and ordinary wall under different conditions. As a result, the cooling rate of PCM wall is 39.41% lower than that of ordinary wall and the heating rate of PCM wall is 27.83% lower than that of ordinary wall. The experiment demonstrates that the application of Na2HPO4?12H2O/GN as PCM for the wall is an effective way to regulate the room temperature.