| Solar greenhouse because of its simple structure, can greatly take advantage of solar energy and is widely used in cold areas of agricultural production in arid regions of our country. To grasp the characteristics and changes regulations of cold and drought area of solar greenhouse can provide scientific and effective theoretical basis in construction and control of greenhouse to improve the productivity of greenhouse.In this experiment, we use solar greenhouse of planting production as the object in our country where in cold and drought area of Saihan district in the west of Hohhot. Through long-term test greenhouse inside and outside air temperature under different weather, solar radiation, soil temperature and internal wall surface heat flux and soil and other environmental parameters,choose measures data of sunny and snow weather to make analysis, using CFD approach to mode and simulation of the temperature field of greenhouse.The results showed that:changes with solar elevation angle is a sine curve; in the condition of sunny weather, the changes of temperature are more dramatically, the minimum temperature in greenhouse appeared at about 8:00, the highest temperature is about 13:00; while the temperature are changing slowly in snow weather, the minimum temperature in greenhouse appeared at about 9:00, the highest temperature appears at about12:00; in the condition of sunny weather, the highest value of 5cm,10cm,15 cm soil temperature were found in 15:00,16:00,18:00, soil temperature of extreme value of the time is lag while in the snow weather is not obvious; At night, the wall surface heat flux is higher than the ground in sunny, but lower than the ground in snow. Finally the simulation results and actual measurement have been the comparing test results found that both match each other, using the CFD method was verified on greenhouse modeling analysis of the rationality and feasibility of sunlight greenhouse for reasonable construction of cold dry areas. |
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