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本文提出一种用于解析建筑中辐射换热问题的新方法。此法的基本思路在于把一个多面体系划分成若干个单元,并通过作者提出的均一等效化处理过程,将复杂的多面辐射换热体系,最终转变成由两个平行表面组成的二面体系。本法根据计算模型的特点,定名为单元传递法。利用本法,能尽量按建筑实情分析问题,整个计算易于通过手算完成,不必求解联立方程组,而且,由于本法较严密地按灰体辐射换热机理处理近似简化过程,与其它现行的近似法相比,计算精度较高。文中最后,列举本法在四个方面的实际应用问题,这些问题是:1.确定在实际条件下的表面辐射换热系数;2.确定任一表面的辐射换热量;3.确定工作面水平的环境平均辐射温度;4.确定分层空调车间空调区的辐射得热量。全部有关均一等效化的计算式和应用计算式,均汇总成表,以便应用。
This paper presents a new method for the analysis of radiation heat transfer problems in buildings. The basic idea of this method is to divide a multi-faceted system into several units, and through the uniform equalization process proposed by the author, the complex multi-faceted radiation heat exchange system is eventually transformed into a two-plane system consisting of two parallel surfaces. . According to the characteristics of the calculation model, this law is named cell transfer method. By using this method, the problem can be analyzed as far as possible according to the actual situation of the building. The entire calculation is easy to be done by hand, and it is not necessary to solve the simultaneous equations. Moreover, this method is more closely followed by the gray body radiative heat transfer mechanism to handle the approximate simplification process and other existing Compared with the approximation method, the calculation accuracy is higher. Finally, in the article, practical application problems of the method are listed in four aspects. These problems are: 1. Determine the surface radiation heat transfer coefficient under actual conditions; 2. Determine the radiation heat transfer amount of any surface; 3. Determine the working surface The level of the ambient average radiation temperature; 4. Determine the radiation heat gain in the air-conditioning zone of a stratified air-conditioning plant. All calculation formulae and application formulas for uniform equivalents are summarized in a table for application.