能源连续墙运行期热湿耦合传递数值模拟研究

Numerical Investigations of Coupled Heat and Moisture Transfer during the Operation of Energy Diaphragm Wall

目前国内外针对能源连续墙的研究主要集中在其热性能和力学行为,然而,埋管换热器置于连续墙内将会对墙体及建筑内部空气带来影响,关于其运行期的热湿耦合传递过程的研究尚缺乏。分析了能源连续墙内部由于埋管换热器传热过程引起的热湿耦合迁移过程,重点研究室内侧壁面的温湿度变化以及通过壁面的显热,潜热热流密度和湿通量。根据埋管换热器不同运行工况:夏季放热、冬季吸热,对比分析了能源连续墙在不同取/放热强度下温度场和湿度场的变化及差异。研究结果表明:在冬夏两季时,能源连续墙运行造成的壁面显热热流密度达到最大水平。而湿通量分和潜热热流密度的最大通量值则发生在过渡季节。夏季埋管的换热功率增加时,壁面夏季显热热流密度和潜热热流密度均增大了。

Current domestic and international research on energy diaphragm walls focuses on the thermal performance and mechanical behavior. However, heat exchangers integrated inside the diaphragm wall will induce an impact on the wall and the air inside the building, and there is a lack of attention on the coupled heat and moisture transfer during the operation of energy diaphragm wall. This paper analyses the coupled heat and moisture transfer processes within the energy diaphragm wall, focusing on the temperature and humidity changes at the interior wall surface as well as the sensible heat, latent heat and moisture flux through the wall surface. According to the different operating conditions of the heat exchanger: heat injection in summer and extraction in winter, both the temperature and humidity under different heat injection/extraction levels are investigated. Results show that the flux of the sensible heat through the wall surface reaches its maximum level during the winter and summer. In contrast, the maximum flux of the moisture and latent heat occur during the transition seasons. Both the sensible and latent heat flux increase during the summer months when the rate of the heat exchanger increases.