近零能耗建筑外挑空调板保温方案优化设计

Optimization of Thermal Insulation Scheme for Exterior Air-Conditioner Slab of Nearly Zero Energy Buildings

外挑空调板是一个典型的结构性热桥部位,通常,增加热桥部位的保温层厚度可以减少该节点的线性热桥传热系数,从而降低建筑整体能耗.然而,保温层厚度的增加会导致施工难度加大,安装安全性风险升高,同时也会导致增量成本随之加大.因此,确定合适的保温层厚度是热桥保温方案优化设计的关键.本文以某高层近零能耗居住建筑的外挑空调板为例,提出了空调板保温厚度的优化取值方法.分别在3个典型城市的气象条件下,对该节点的多种保温方案进行了热桥值、基本舒适度、热桥对建筑累计热负荷影响的分析和全寿命周期费用计算,可供工程项目设计参考.

The external air-conditioner slab is a typical structural thermal bridge.Generally,increasing the thickness of the insulation of the thermal bridge can reduce the linear thermal bridge heat transfer coefficient of the node,thereby reducing the overall energy consumption of the building.However,the thicker insulation layer will result in difficulty of construction and risk of installation durability,as well as increasing the incremental cost.Determining an appropriate thickness of the insulation layer is the key sector to an optimal design of thermal bridge insulation.This paper proposed the optimizing design method of the insulation thickness of exterior air conditioning panels of a nearly zero energy high-rise residential building.Basing on meteorological conditions of three typical cities,thermal bridge values,basic thermal comfort,and effects on the accumulated heating load of various insulation schemes were analyzed,additionally life cycle costs were calculated for references of engineering projects.