低质水相变墙体的性能模拟
Performance simulation of phase change walls with low exergy water
摘要：
将毛细管与相变墙体相结合，利用ANSYS Fluent软件进行模拟计算，研究了冬、夏2种工况下相变材料的物性参数、供回水温度及双层相变材料布置方式对墙面热流量和温度的影响。结果表明：相变温度与平均供水温度的差值越大，蓄能越多，对蓄能过程有利；相变材料的导热系数越大，相变材料蓄热越快，墙面热流量越大，导热系数对释能影响较小；相变材料的相变潜热越大，墙面温度越稳定；对于单层毛细管双层相变蓄能，宜将较厚的相变材料布置在保温层侧，较薄的相变材料布置在墙面侧，毛细管布置在较厚的相变材料层中。
Abstract：
Combining the capillary with the phase change walls, studies the effects of physical parameters, supply and return water temperatures and double-layer phase change material arrangement on wall heat flux and temperature under winter and summer working conditions by using ANSYS Fluent software. The results show that the greater the difference between the phase change temperature and the average water supply temperature, the more energy storage, which is beneficial to the energy storage process. The greater the thermal conductivity of the phase change material, the faster the heat storage of the phase change material, and the greater the wall heat flux. The thermal conductivity has less effect on energy release. The greater the latent heat of phase change material, the more stable the wall temperature. For the single-layer capillary and double-layer phase change material, the thicker phase change material should be arranged on the side of the insulation layer, the thinner phase change material on the wall side, and the capillary in the thicker phase change material layer.
Keywords:phase change wall, capillary, phase change material, physical parameter, supply and return water temperature, layout