Effect of moisture transfer on building energy performance

摘要：

　　There is an increasing interest to decrease the building energy consumption all over the world.One way is decreasing building energy consumption by optimizing hydrothermal performance of building envelope.Most building materials are porous,composed of solid matrix and pores.Moisture transfer and accumulation within porous building material has an important impact on the hydrothermal performance of building envelope,energy consumption and indoor environment,however often not taken into consideration adequately.This paper focused on the effect of moisture transfer on building energy performance,by predicting moisture transfer in building envelope and analyzing the impact of moisture transfer on thermal conductivity of porous building envelope material.At first,a transient dynamic model for the coupled heat and moisture transfer in porous media was developed with the driving potentials of temperature and air humidity ratio.This model takes into consideration the phase change of water and can deal multi-layers building envelope.And then two typical walls(brick wall and aerated concrete wall)were calculated with this model,and thermal conductivity of three main materials(brick,aerated concrete and cement mortar)was analyzed.The results show that: 1)both the two frequently-used walls are affect by the high temperature and humidity moisture under the hot and humid climate,and both keep high value of moisture content ;2)in the three main materials moisture transfer can affect its thermal conductivity in a great extent.

关键词： Moisture Transfer Porous Material Building Envelope Energy Performance Thermal Conductivity

作者: Guo-jie Chen Xiang-wei Liu You-ming Chen Xing-guo Guo Ying-ying Tan

作者单位: College of Civil Engineering,Hunan University,Changsha,410012,China;College of Mechanical Engineerin College of Civil Engineering,Hunan University,Changsha,410012,China School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China

会议类型: 国际会议

会议名称: 第26届效率、成本、优化、模拟及环境影响能源系统国际会议

会议地点: 桂林

会议语种:英文

页码: 1-6

在线出版日期: 2013-07-16（万方平台首次上网日期，不代表论文的发表时间）