摘要
本文将拱形塑料大棚的横截面看作半圆形,用数学模式计算了南北向和东西向大棚面上直射光入射角的变化,并分析棚面上直射光反射率的日变化、季节变化和纬度变化。在此基础上,计算了两种走向大棚面法向直射光强的日平均比值。根据比值的季节和纬度变化,对0—60°N地区拱形大棚宜选择的合理走向作出了决策。
The cross section of the Quonset-type plastic greenhouse is considered as a semi-circle. By means of the mathematical model,the incident angles of direct solar radiation at various elevations on the plastic surface of the greenhouse in north-south and east-west orientations are calculated and daily, seasonal and latitudinal changes of its reflectivityon the plastic surface are analyzed. On this basis, calculation is made for the mean daily ratio of the intensity of direct solar radiation normal to the surface of the greenhouse in the two orientations. A decision is thus made for the reasonable choice of orientation in the zone of 0-60°N from the seasonal and latitudinal changes of the ratio.
出处
《南京气象学院学报》
CSCD
1990年第3期417-425,共9页
Journal of Nanjing Institute of Meteorology
