日光节能温室下沉深度对其采光性能的影响

The effect of sinking depth on lighting performance of the solar energy-saving greenhouse

为了减少下沉深度对室内采光性能的影响,在保证室内高效采光率的情况下提出了确定室内适宜下沉深度的方法,即用某时刻太阳的具体位置来计算此时刻下沉壁面在室内所产生的阴影区域面积,然后以室内采光率为约束条件来确定下沉深度。本文以10m跨度的下沉式温室为例,在室内的总阴影率不超过30%的前提下,计算得到不同地区的适宜下沉深度。计算结果表明,纬度越高的地区其适宜的下沉深度越小,各地区在建造下沉式温室时应将该因素考虑在内。

In order to reduce the effect of the sinking depth on lighting performance in the solar energy-saving greenhouse, a method is proposed to determine the proper sinking depth of the greenhouse under the condition of ensuring efficient lighting rate. The method is to calculate the shadow＇s area of the sinking-wall region on a certain moment and the specific location of the sun on this moment, and then determine the sinking depth with the restrictions of indoor lighting rate. Take the 10m-span sink- ing-greenhouse for example, the paper calculates the proper sinking depth of different religions on the premise of the total indoor shadow rate no more than 30 percent. The results show that the higher the latitude is, the smaller the sinking depth is needed. And this factor should be taken into account during the construction of the solar energy-saving greenhouse.