皖南民居墙体热工性能的计算分析

西安科技大学 建筑与土木工程学院,陕西 西安 710054

皖南地区; 墙体; 热工性能; 计算分析

Analysis on thermal performance of Wannan residential wall
DI Peng,WANG Zhen-zhen

(College of Civil and Architectural Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

Wannan area; wall; thermal performance; theoretical calculation

备注

皖南地区民居建筑的墙体热工性能是影响其室内舒适度的主要因素之一。通过对该地区特殊构造的空斗墙体的热工性能进行深入研究,根据热工原理,以热阻和传热系数值为衡量标准,针对特殊构造的空斗墙提出较科学的计算方法,对比空斗墙体在不同砌筑方式、不同墙体材料以及不同空腔填充材料条件下的热阻及传热系数值,并与实体墙对比分析,得到空斗墙体的K值大小规律为全斗无眠﹥一眠三斗﹥一眠二斗﹥一眠一斗; 填有黄泥的空斗墙热阻值较空气间层空斗墙提高约16%; 较中间层均为黄泥的青砖空斗墙热阻比粘土砖空斗墙的热阻高出10%; 青砖实体墙较粘土砖实体墙热阻能高出14%.由结果分析得到,空斗墙比实体墙的热稳定性强,保温性能好; 青砖较粘土砖的热阻值更大,更为节能,而空斗墙体的热工性能与空腔的体积无正比关系,空斗墙体空腔中的填充材料性能是影响墙体热工性能的主要因素,填充材料的导热系数越小,墙体热工性能越好。

Thermal performance of wall is one of the main factors affecting indoor comfort.Through in-depth study of thermal performance of the cavity wall,according to thermal engineering principles and measure thermal resistance and heat transfer coefficient,this paper proposed a more scientific method of calculation for the special structure of the cavity wall,contrast the thermal resistance and heat transfer coefficient of masonry of the cavity wall in different ways,materials and walls filling material,as well as comparative analysis with solid brick wall.Results show that the value of the heat transfer coefficient of the cavity wall with no sleep bricks is the largerest,thermal resistance of cavity wall filling with yellow mud is 16% higher than air.Thermal resistance of grey bricks is 10% higher than clay bricks.Thermal resistance of grey solid bricks wall is 14% higher than clay solid bricks.So that thermal resistance of cavity wall is larger than solid brick wall; for the same kind of laying method,thermal resistance of grey bricks is higher than clay bricks; and for the same materials,thermal resistance of cavity wall is larger than solid brick wall.Thermal performance of cavity wall is not proportional to the percentage of cavity,and is closely related to the cavity filling material type,with smaller thermal conductivity is,and thermal performance of cavity wall is better.