隔热涂料用于建筑外表的热工性能等效折算方法

EQUIVALENT CONVERSION AND CALCULATION METHOD OF THE THERMAL PERFORMANCES FOR THERMAL INSULATION COATING PAINTED ON THE EXTERIOR SURFACE OF BUILDING

基于现有典型气象年气候数据,首先建立室外综合温度的计算模型,并用其考察表面长波发射率和短波吸收率对室外综合温度的影响。结论表明,表面短波吸收率对室外综合温度的影响很大,而长波发射率影响很小。然后,将室外综合温度进行分解,利用传热叠加原理和傅里叶级数展开理论,导出隔热涂料用于建筑外表的附加热阻和附加热惰性指标计算公式。最后,以厦门地区应用为例,计算水平屋面涂刷涂料的附加热阻和附加热惰性指标,提出利用附加热惰性指标和综合附加热阻评判隔热涂料在某地区应用的适宜性。

Based on the existing typical meteorological year climate data; a calculation model of outdoor integrated temperature is firstly established. By using the calculation model, the influences of long-wave emittance and short-wave absorptance of the surface on outdoor integrated temperature are investigated respectively. It shows that, the short-wave absorptance of the surface has great influence on outdoor integrated temperature ; the long-wave emittance of the surface has little influence on outdoor integrated temperature. And then, the outdoor integrated temperature is decomposed into short-wave equivalent temperature and long-wave equivalent temperature. With the application of the superposition theory of heat transfer and the principle of Fourier series expansion, the calculation formulas of attached thermal resistance and attached thermal inertia are derived for the thermal insulation coating painted on the exterior surface of building. Finally, as an application example of this method in Xiamen, the attached thermal resistances and attached thermal inertia of the thermal insulation coating painted on the horizontal roof are calculated and illustrated. The attached thermal inertia and integrating attached thermal resistance are proposed to estimate the application suitability of thermal insulation coating in a region.