砖-粉煤灰砌块夹心复合墙体传热系数研究

为计算砖-粉煤灰砌块夹心复合墙体传热系数,分析其热工性能,进行了普通砖墙体、普通砖-粉煤灰砌块夹心复合墙体、再生砖墙体和再生砖-粉煤灰砌块夹心复合墙体的传热系数试验.依据普通砖、再生砖及粉煤灰砌块导热的基本机理,结合现有研究成果,给出了这几种材料的导热系数与温度、湿度的关系表达式,并提出了适用于工程设计的传热系数真实值计算方法.通过分析试件传热系数的试验值、理论值及真实值,证明真实值计算方法正确合理;用再生砖替代普通砖应用于砖-粉煤灰砌块夹心复合墙体同样能达到较好保温效果,这可为再生砖的应用及砖-粉煤灰砌块夹心复合墙体建筑节能细化设计提供依据.

Heat Transfer Coefficient of Composite Wall with Fly Ash Blocks Sandwich

The heat transfer coefficient of composite wall with fly ash blocks sandwich were studied. The heat transfer coefficient of four forms of wall specimens were determined. Based on the basic mechanism of the thermal conductivity of the four wall types:(1)clay bricks wall; (2)clay bricks wall with fly ash blocks sandwich; (3)recycled concrete bricks wall; (4)recycled concrete bricks wall with fly ash blocks sandwich, the relationship between coefficient of thermal conductivity of various materials and temperature,humidity could be derived,and an actual value calculation method for calculating the heat transfer coefficient that suitable for engineering design was also proposed. By analyzing the experimental values,theoretical values and the actual values of the specimens,the actual value calculation method was proved to be correct and reasonable; using recycled concrete bricks instead of clay bricks in composite wall with fly ash blocks sandwich the good insulation effect can also achived, which contributes to a building energy efficiency design detailing on using recycled concrete bricks and composite wall with fly ash block sandwich.