The Rearch On The Distribution Of Sun Light Environment In Solar Greenhouse

In order to explore the Light transfer law in Solar Greenhouse,option the greenhouse without plant and tomato cultivation in greenhouse to experiment.Two greenhouse is 60 m long,span is 8 m,the north wall is 3.5 m the high ridge is 4 m.At the same time to measure the each surface solar radiation,Different plants bearing light intensity and the spectral distribution,each surface temperature and other environmental data in the greenhouse.Analyzed the measurement date and the results are as follows:The lighting distribution of no plants grown in greenhouse,including the direct light scattering light absorption about soil surface,the north wall,and on the surface of the slope,determine the distribution of various surface direct light and scattering light in greenhouse,the results show that the direct light intensity is much higher than the scattering light in greenhouse in winter and spring season.The soil surface direct light intensity after much fewer but higher than the slope,soil surface direct light account for 40%of the total direct light intensity,accounted for 33%of the north wall surface,slope surface accounted for 27%;And the intensity of scattered light is mainly distributed in the soil surface,soil surface scattering light intensity of scattered light total 51%,accounted for 38%of the north wall,the slope after accounted for only 11%of the total intensity of scattered light.The distribution about Blade Angle of different plant groups has a certain distribution on direct light and scattering light's absorption.The test was selected the period when the plants in blossom period and fruit enlargement period,Since December 2015 until the end of May 2016 test data,During the half year,we choose sunny days per month of data and then analysis.The result show that,the direct light absorption effect is the same whenever the plants leaves in horizontal distribution,the vertical distribution,special Angle distribution and the random distribution of leaf layer,after 12 month was the minimum,to may gradually rise,and 3,4,5 month to direct light uptake increased were relatively flat,during a day,The increase of tomato leaf layer for the absorption of direct light speed is less than the drop speed,the highest absorption of all appear at from 10:00 a.m.every day to 13:00 p.m.,it was almost the same about the uptake of direct light intensity at 8:00 a.m.and 17:00 p.m.These four kinds of structures of scattered light absorption effect were the same as the tendency of the direct light absorption.but uptake.The random distribution leaf layer structure and when crossing Angle is 45° are close and the maximum,and then the horizontal distribution layer structure,the vertical distribution of leaf structure of scattered light absorption of the least.Inside and outside the sunlight greenhouse spectral radiation has a certain regularity,This experiment by time,former points of different distance in greenhouse and light quality as variables to explore the distribution of spectrum,the maximum variation of the diurnal variation of the spectrum regularity appeared at 11:00?12:00,The influence of distance on spectrum distribution is not large,the greenhouse where tomato planting in spectrum distribution than no plants grown in greenhouse spectrum distribution obviously,but in both cases ultraviolet light has no obvious change.the solar radiation intensity of tomato group under the different azimuth is the above section big and the following part of small.But plants under some radiation brightness have little influence on variation with time.