摘要
考虑传湿对多孔介质墙体传热的影响,根据单元体质量守恒和能量守恒,建立了非稳态热湿耦合数学模型模拟多孔介质墙体的热湿传递过程,并在长沙对一墙体的热湿耦合传递开展了实验测试,应用COMSOL Multiphysics软件对所建模型进行数值计算,将计算结果与EN15026, HAMSTAD等验证实例和实验测试结果对比,验证了所建数学模型的正确性。结果表明,模型的计算结果与验证实例的结果高度吻合,与实验测试结果吻合良好,室内侧分界面处空气相对湿度的平均偏差为4.7%,最大偏差为8.6%,温度的平均偏差为0.4℃,最大偏差为0. 74℃,室外侧分界面处空气相对湿度的平均偏差为3.7%,最大偏差为7.2%,温度的平均偏差为0.93℃,最大偏差为1.97℃,证明了该模型有很好的准确性。
In this paper, considering the moisture transfer effect on heat transfer, a coupled heat and moisture transfer model based on mass and heat balances is presented to simulate the thermal performance of porous building elements with the multi-physics soft-COMSOL-to solve the model. Then, an experimental setup is built in Changsha to test the temperature and moisture distribution within an aerated concrete wall subjected to atmosphere conditions. Finally, a newly developed hygrothermal model is validated by comparing with the benchmark test of EN15026, HAMSTAD project and experimental data. Results show that the simulation results are quite consistent with the results of the benchmark test of EN15026 and HAMSTAD project. Such simulation results also agree well with the experimental data. The average deviations of relative humidity and temperature are 4.7% and 0.4 ℃, and the maximum deviations are 8.6% and 0.74 ℃, respectively at the interface between the lime cement plaster and aerated concrete brick(indoor side). At the interface between cement plaster and aerated concrete brick, the average deviations of relative humidity and temperature are 3.7% and 0.93 ℃, the maximum deviations are 7.2% and 0.93 ℃, respectively(outdoor side). It turns out that the model is of good veracity to evaluate heat and moisture transfer in porous building elements.
作者
鲍洋
陈友明
刘向伟
董文强
房爱民
BAO Yang;CHEN Youming;LIU Xiangwei;DONG Wenqiang;FANG Aimin(College of Civil Engineering,Hunan University,Changsha 410082,China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)
出处
《建筑科学》
CSCD
北大核心
2018年第10期66-75,共10页
Building Science
基金
国家重点研发计划课题"建筑本体与建筑能耗耦合计算模型开发"(2017YFC0702201)
关键词
多孔介质建筑墙体
热湿耦合传递
温度
相对湿度
模型验证
porous building element
coupled heat humidity
temperature
relative humidity
model verification