摘要
排风隔热墙是一种新型节能外墙,建立其一维非稳态传热模型。利用该模型计算出周期外扰下墙体各位置的温度波响应,经过与二维非稳态模型计算结果相比较,发现一维非稳态传热模型具有很好的准确性,适合工程计算和分析。对渗流层厚度、渗流速度、外层结构厚度对墙体内表面温度波响应的单因素分析表明:随着渗流层厚度、渗流速度的增大,内表面温度波的幅值减小,但对相角延迟的影响不明显;随着外层结构厚度的增大,内表面温度波的幅值也减小,而且相角延迟增大。
Exhaust-air-insulation （EAI） wall is a new kind of envelope structure of promising high thermal resistance. The one-dimensional unsteady heat transfer model is built to represent the temperature wave response in EAI wall under the periodically boundary conditions. The two-dimensional method is applied to search the accurate temperature response. In comparison with the accurate values in different conditions, the results from the one-dimensional model show good accuracy. The effects of the thickness of the porous material layer, the wind speed of exhaust air, and the thickness of exterior structural layer on the unsteady heat transfer performance of EAI wall are expounded. Calculation reveals that the larger the thickness of the porous material layer, or the higher wind speed of exhaust air, the lower the temperature amplitude of the temperature wave on the innermost surface of EAI wall. But the effect on the phase delay is inconspicuous. The larger the thickness of exterior structural layer, the lower the temperature amplitude, and the larger the phase delay.
出处
《建筑节能》
CAS
2015年第8期35-39,共5页
BUILDING ENERGY EFFICIENCY
基金
自然科学基金资助项目(51378231)
关键词
排风隔热墙
一维非稳态传热模型
单因素分析
非稳态传热特性
exhaust-air-insulation wall
one-dimensional unsteady heat transfer model
single factoranalysis
unsteady heat transfer performance
