估计南向坡面总辐射最佳倾角的表示式

AN EXPRESSION FOR ESTIMATING OPTIMUM SLOPE OF SOUTH FACING SURFACE

提出了一个估计各月南向倾斜面太阳总辐射最佳倾角简单表示式．该式表明：太阳赤纬、水平面上太阳总辐射与直接辐射之比（下简称辐射比）以及地面反射率为常数时，最佳倾角随纬度增加而增大，且冬季增大较快；当纬度、太阳赤纬和地面反射率不变时，最佳倾角随水平面上辐射比增大而减小，尤其在高纬冬季更加显著；夏季最佳倾角随辐射比的变化较小．这表明一地的辐射气候状况对该地的坡面最佳倾角有一定影响。

An expression to evaluate the optimum tilted angle of a flat south facing surface, on which the possible maximum daily global radiation amount may be received, is presented in this paper. It is a function of the geographical latitude, the suns declination, the daily global beam ratio on a horizontal surface and the ground reflectivity. It is indicated that the optimum tilted angle increases with the increasing latitude for a given decliation and God/Bod ratio. And it increaeses with the God/Bod ratio for a particular latitude and declination. This fact implies that the effect of climatic condition of site on the optimum tilied angle is marked during winter and relatively small during summer. The expression is valid for the locations with the latitude less than 60° in the northern hemisphere and for each month of the year.