保温层对墙体温度场的延迟和衰减  

Time Lag and Decrement of Thermal Insulation Layer on Wall Temperature Field

作　　者：廖绍凯[1] 牛志荣[1] 庄伟晨[1] 

机构地区：[1]嘉兴学院建筑工程学院,浙江嘉兴314001

出　　处：《建筑节能》2013年第5期41-44,共4页BUILDING ENERGY EFFICIENCY

基　　金：嘉兴市科技计划项目(2011AY1032);嘉兴市重点实验室--建筑节能技术实验室资助项目(00510220)

摘　　要：基于有限差分法,建立了考虑环境温度变化的外墙外保温体系的温度场数值计算模型。利用该模型,对比了混凝土墙体和聚苯板外墙保温体系的温度场,并分析了保温层材料的热物理性能的变化对墙体的延时和削弱作用。计算结果表明,聚苯板保温层对墙体的保温效果较好;其次,随保温层材料的导热系数的减少或热容的增加,墙体的延迟时间和衰减因子呈指数增长。Based on the finite differential method,numeric temperature field models for outer-walls external thermal insulation system were developed,in which environmental temperature were taken into account.By applying the model,the temperature field of concrete wall and external thermal insulation system of polystyrene board were compared,the time lag and decrement effects of wall were analyzed with the physical properties change of the thermal insulation layer material.The calculation results show that the insulation effect of external thermal insulation system of polystyrene board is better;Secondly,the delay time and decrement factor is exponential growth with the reduce of ther mal conductivity or increases of heat capacity of thermal insulation layer.

关 键 词：保温层 导热系数 热容 延迟时间 衰减因子 

分 类 号：TU111.19[建筑科学—建筑理论]