毛细管与相变材料复合墙体性能实验研究
Experimental study on performance of composite wall of capillary and phase change material
摘要：
为了获得毛细管与相变材料复合墙体的蓄释能特性，建立了复合相变墙体实验模型，以空气源热泵与太阳能复合机组作为实验房间与实验模型的冷热源，研究了冬季工况下不同供水温度和蓄能时长对复合相变材料相变程度、室内侧墙体表面热流密度的影响。实验结果表明：当膨胀石墨的质量百分比为5%时，复合相变材料有较合适的导热系数，且潜热较大；当毛细管供水温度和蓄能时长分别为30 ℃、8 h和32 ℃、6 h时，复合相变材料在蓄热时相变完成，释能效果较好，平均热流密度分别为40.328 W/m2和39.221 W/m2。
Abstract：
In order to obtain the energy storage and release characteristics of the composite wall of capillary and phase change material, an experimental model of the composite phase change wall is established in this paper. The composite unit of air-source heat pump and solar collector is used as the cold and heat sources for the laboratory and the model experiment. The effects of different water supply temperatures and energy storage time length on the phase transformation degree of the composite phase change material and the heat flux of indoor wall surface under winter conditions are studied. The experimental results show that when the mass percentage of expanded graphite is 5%, the composite phase change material has a suitable thermal conductivity and a large latent heat. When the water supply temperature and energy storage time length are 30 ℃, 8 h and 32 ℃, 6 h, respectively, the phase change process of the composite phase change material is completed during heat storage, the energy release effect is better, and the mean heat flux is 40.328 W/m2 and 39.221 W/m2, respectively.
Keywords:capillary;phasechangematerial;compositewall;energystorageandreleasecharacteristics;watersupplytemperature;energystoragetimelength