夏热冬冷地区热桥对低层建筑能耗的影响  

Influence of thermal bridges on energy consumption of low-rise buildings in hot-summer and cold-winter zone

作　　者：杜海存[1] 谢潇宇 郭兴国[2] 刘向伟[2] DU Haicun;XIE Xiaoyu;GUO Xingguo;LIU Xiangwei(School of Mechatronics Engineering,Nanchang University,Nanchang 330031 China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]南昌大学建筑工程学院,江西南昌330031

出　　处：《南昌大学学报（工科版）》2020年第3期254-259,共6页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(51708271,51208247)。

摘　　要：考虑土壤温度以及辐射换热对热桥能耗的影响,利用THERM建立二维稳态热桥传热模型,基于有限元法得出墙体的温度分布及热流密度,进而得出墙体的传热系数值。根据等效传热系数法将该传热系数作为墙体的平均传热系数代入Design Builder中计算建筑的冷、热负荷,与不考虑热桥时的建筑冷、热负荷进行对比得出热桥对建筑能耗的影响。以夏热冬冷地区4个典型城市南昌、成都、武汉、上海为例,分析了某二层居住建筑中热桥对低层建筑能耗的影响。模拟结果表明:夏季墙体平均传热系数增大27.02%~30.28%,建筑冷负荷增大3.36%~4.63%;冬季墙体平均传热系数增大20.81%~25.00%,建筑热负荷增大6.49%~7.76%。同一季节与城市下建筑负荷变化与墙体平均传热系数变化成正相关。相同变化量下土壤温度对墙体平均传热系数的影响大于室外空气温度。The influence of soil temperature and radiation heat exchange was considered by the energy consumption of thermal bridge.A two-dimensional thermal bridge heat transfer model was established by THERM.The temperature distribution and heat flux of the wall were obtained by the finite element method.The heat transfer coefficient of the wall was obtained by calculating the temperature distribution and heat flux of the wall,based on the equivalent heat transfer coefficient method.It was substituted into Design Builder as the average heat transfer coefficient of the wall in order to get the cooling and heating loads of the building.The influence of the thermal bridge on the building energy consumption was obtained by comparing the building loads with and without the thermal bridge.Four two-storey residential buildings were taken as examples to analyze the influence of thermal bridge on building energy consumption,which was separately located in Nanchang,Chengdu,Wuhan and Shanghai.The results showed that:In summer,the average heat transfer coefficient growth rate of the wall was 27.02%-30.28%,and the cooling load growth rate of the total building was 3.36%-4.63%.In winter,the average heat transfer coefficient growth rate of the wall was 20.81%-25.00%,and the heating load growth rate of the total building was 6.49%-7.76%.In the same season,the change of building load was positively correlated with the change of the average heat transfer coefficient of the wall.Under the same variation,the effect of soil temperature on the average heat transfer coefficient was greater than the outdoor air temperature.

关 键 词：夏热冬冷地区 土壤温度 辐射换热 等效传热系数法 平均传热系数 

分 类 号：TU[建筑科学]