关于排烟风管隔热层厚度的探讨

Discussion on thickness of thermal insulation layer of smoke exhaust ducts

GB 51251-2017《建筑防烟排烟系统技术标准》对设置在吊顶内的排烟风管的隔热层提出了要求,且明确了隔热层厚度不小于40 mm,但规范并未明确隔热材料的导热系数等热物性参数。本文讨论和分析了隔热层、复合包覆风管的隔热性及耐火极限等,为设计、审查、验收提供参考。

Technical standard for smoke management systems in buildings(GB 51251-2017)puts forward the requirements for the thermal insulation layer of smoke exhaust ducts in suspended ceilings,and clarifies that the thickness of the thermal insulation layer is not less than 40 mm.But the specification does not specify the thermal physical parameters such as the thermal conductivity of the thermal insulation materials.In this paper,the thermal insulation performance and the fire endurance of the thermal insulation layers and the composite clad ducts are discussed and analysed,which provides a reference for design,review and acceptance.