空调建筑外墙和屋顶经济绝热厚度的计算

该文介绍了种计算空调建筑外墙和屋顶经济绝热厚度的模型。该模型根据热流通过不同组件时间的相关分析并运用Lagrange乘子法，计算了不同增初投资额条件下外墙和屋顶的经济绝热厚度。运用该模型，依据上海、南京、武汉和重庆的气候参数对一典型住宅建筑进行了数值计算。计算结果表明，从经济评价角度来看，外墙保温隔热宜采用各热材料价格和气候因素对外墙和屋顶绝热材料厚度取值的影响。

CALCULATIONS OF ECONOMIC THERMAL INSULATION THICKNESSES ON ROOF AND WALLS OF AIR-CONDITIONED BUILDINGS

This paper presents a techno economic model for optimizing thermal insulation thicknesses of roof and walls of an air conditioned building. The model is based on the time depending analysis of heat flow through building components for predicting thermal performance of the building. Using Lagrange multiplier method, the analysis has been extended to determine the economic insulation thickness for a given investment. This approach is applied to one residential building corresponding to four cities viz. Shanghai, Nanjing, Wuhan and Chongqing. The calculations have shown that the insulation thickness over various components should be different, and the insulation over the west wall and the roof provides most savings whereas on the south wall the least. In addition, sensitivity analysis has been made.