冬季太阳能相变蓄热通风墙热工性能的数值模拟  

NUMERICAL SIMULATIONS ON THERMAL PERFORMANCES OF PASSIVE SOLAR VENTILATED WALLS WITH LATENT HEAT STORAGE IN WINTER

作　　者：陈佳慧 康鑫 Chen Jiahui;Kang Xin(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Hubei Green and Intelligent Building Engineering Technology Research Center,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]湖北省绿色智能建筑工程技术研究中心,武汉430070

出　　处：《太阳能学报》2023年第4期522-530,共9页Acta Energiae Solaris Sinica

摘　　要：在建筑通风墙体中加入相变材料被认为是改善其冬季热工性能的有效方法。相变材料在墙体中可采用分块的方法进行宏观封装,此时材料在熔化过程中产生的自然对流现象十分显著,不能被忽略。该文使用开源计算流体力学框架OpenFOAM下开发的求解器针对被动式相变蓄热通风墙体的热工性能开展了数值研究,以准确模拟相关传热、流动、相变等物理过程。计算结果表明:相变材料蓄热墙能有效降低室内温度波动;相变材料内部的自然对流作用很大程度上影响着材料的熔化与凝固速度,因此材料封装时的长宽比以及分块方式应做出审慎选择。Adding phase change materials(PCMs) to building ventilation wall is considered to be an effective means to improve its thermal performance in winter.PCMs can be packaged macroscopically in the wall by the method of block.At this time,the phenomenon of natural convection generated in the melting process of materials is very significant and cannot be ignored.In this paper,thermal performances of passive solar ventilation walls with latent heat storage are studied,by using the numerical solver developed based on the open-source CFD framework OpenFOAM.Physical processes of heat transfer,flow dynamics,and phase change of materials are accurately predicted.The results show that the thermal storage wall of PCMs can effectively reduce the fluctuation of indoor temperature.In addition,natural convection in the PCMs greatly affects the melting and solidification rate of materials.Therefore,the length-to-width ratios of PCMs and its blocking-arrangements should be carefully selected.

关 键 词：相变材料 被动式太阳能建筑 数值模拟 通风墙 焓-多孔介质法 

分 类 号：TU111.4[建筑科学—建筑理论]