非均质围护结构传热系数的简化计算及检测方法

对非均质围护结构等效热阻的两种简化计算方法进行了回顾评述,从热阻等效原理证明了这两种简化算法是基于不同的热阻等效得到的,并串联的等效方法较串并联等效方法更适于非均质围护结构传热系数的简化计算。对现有检测非均质围护结构传热系数方法进行分析讨论,指出用热箱法可以检测流过非均质围护结构的热流量,但不宜直接测量表面温度来计算非均质围护结构等效热阻,提出了“真空屏热箱法”检测非均质围护结构传热系数,并对这一方法的原理进行了说明。

The Calculation and Testing Methods of the Thermal Transmittance of Inhomogeneous Building Envelope

Two calculation methods of the equivalent thermal resistance of inhomogeneous building envelope are demonstrated from the differential connections of thermal resistances;it shows that the formula which is resulted from the parallel-series connection is more appropriate than that from the series-parallel connection for approximately calculation of the equivalent thermal resistance.The testing method of the thermal transmittance of inhomogeneous building envelope with hot box is also discussed in this paper;it shows that the heat flux that flows through the inhomogeneous building envelope may be measured by the hot-box, but the equivalent thermal resistance can not be obtained from the measuring of surface temperatures,furthermore,a new test method called "vacuum screen hot-box method" is advanced for the testing of the thermal transmittance of inhomogeneous building envelope,and the test theory of this method is also represented in this paper.