日光温室中直射光的计算机模拟方法——设施农业光环境模拟分析研究之三

    A Method of Computer Simulation of Direct Solar Radiation within Greenhouses——The third part of serial studies on simulation of light environment of farming under structure

    • 摘要: 在覆盖材料确定时,温室采光屋面的几何形状直接决定着温室的光环境,即温室内的采光量及其时空分布特征。本文的主要研究对象是我国目前较为普及的日光温室。首先,采用数学函数方法,生成各种不同曲率的采光屋面,由此构造出具有不同几何形状的日光温室。第二,根据已经建立起的温室采光理论,建立计算机模拟模型,对其内部的直射光环境进行模拟。通过对模拟结果进行评判对比,可筛选出优化的温室采光结构。因此本项研究可为温室结构优化设计和生产管理提供科学依据和分析工具。

       

      Abstract: The geometric shapes of the lighting roof of greenhouses have a direct effect on the light environment--dailylight integral and its distribution inside,when a definite type of cladding materials is given. All studies in this paper are mainly aimed at what is called a"solar greenhouse".Firstly,six types of mathematical functions are selected to generate six kinds of curves, which involve a circle, an ellipse,a parabola,a hyperbola,a cycloid,and a logarithm. Except for the parabola, each of the other five mathematical functions gives rises to an additional number of curves with various curvature through a certain mathematical transformation, which constitute a cluster of curves to imaginatively construct serial greenhouses in different geometric shapes.Secondly, in accordance with this method of calculation, for the solar radiation in greenhouses previously described in another paper,a model of computer simulation has been developed.Thirdly,by using this model ,the light environment of greenhouses has been simulated. During the whole procedure of simulation,the instantaneous and cummulative distribution of solar radiation,daily light integral,and inclined back surface have been taken into consideration separately.This study is useful as a method and a tool for optimization of greenhouse structure as well as for productive management.

       

    /

    返回文章
    返回