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本文给出二种不透气平吸收板的平板式太阳能空气集热器的热平衡方程组,求出热效率的通用化表达式,并对各个因子进行分析.本文通过试验获得效率因子和热损失系数随雷诺数变化的经验关系.用雷诺数和集热器流道几何参数来表示流量率,将流动因子表达为雷诺数和流道几何参数的函数.因而,利用这些因子就可求出这两种平板空气集热器在不同雷诺数和不同串联长度条件下的热效率.
In this paper, two kinds of heat balance equations of planar solar air collectors with airtight absorption plates are given, and the generalized expression of thermal efficiency is obtained, and the various factors are analyzed.In this paper, the efficiency factor and the heat loss coefficient Reynolds number changes in the empirical relationship between the Reynolds number and collector flow geometry parameters to represent the flow rate, the flow factor expressed as a function of the Reynolds number and flow geometry. Therefore, these factors can be used to determine both Thermal Efficiency of Flat-panel Air-Collector at Different Reynolds Numbers and Different Series Lengths.