复合相变墙体供暖特性数值模拟研究  

Numerical simulation of heating characteristics of composite phase change wall

作　　者：范鹏 马立[1] FAN Peng;MA Li(College of civil engineering and architecture,Southwest university of science and technology,Mianyang 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《区域供热》2023年第4期25-31,共7页District Heating

摘　　要：采用宏观封装的方式将相变材料封装在金属板中,将太阳能与热泵结合,提出一种新型相变墙体供暖系统。相变墙体传热性能受相变层厚度和相变材料导热系数的影响,将不同相变层厚度和不同相变材料导热系数相互组合,通过有限元求解,分析各因素对相变墙体传热特性的影响。结果表明:不同的导热系数分别对应着一个最佳的相变层厚度,导热系数0.2 W/(m·K)、0.3 W/(m·K)、0.4 W/(m·K)对应的最佳相变层厚度分别为20 mm、25 mm、30 mm;增大相变材料的导热系数会使墙面温度和热流密度升高,且释能阶段受导热系数的影响较小;相变潜热越大,墙体内壁面的温度和热流密度波动越小,室内热舒适度越好。A new type of phase change wall heating system is proposed by using macroscopic encapsulation of phase change materials in metal plates,combining solar energy with heat pump.The heat transfer performance of the phase change wall is affected by the thickness of the phase change layer and the thermal conductivity of the phase change materia.l By combining the thickness of different phase change layer and the thermal conductivity of different phase change material,the influence of various factors on the heat transfer characteristics of the phase change wall is analyzed by finite element method.The results show that the different thermal conductivity correspond to an optimal thickness of the phase change layer,the thermal conductivity of 0.2 W/(m·K),0.3 W/(m·K),0.4 W/(m·K)corresponding to the optimal thickness of the phase change layer is 20 mm,25 mm,30 mm.Increasing the thermal conductivity of PCM will increase the wall temperature and heat flux,and the thermal conductivity has little influence on the energy release stage.The greater the latent heat of phase change,the smaller the temperature and heat flux fluctuation on the inner wall,and the better the indoor thermal comfor.

关 键 词：相变墙体 导热系数 相变层厚度 数值模拟 

分 类 号：TU111.4[建筑科学—建筑理论]