基于CFD方法的温室散热系统结构优化模拟研究  

Simulation Study on Cooling System Structure Optimization of Greenhouse Based on CFD

作　　者：刘文合[1] 杨英英[1] 徐占洋[1] 

机构地区：[1]沈阳农业大学水利学院,沈阳110866

出　　处：《灌溉排水学报》2016年第4期8-13,共6页Journal of Irrigation and Drainage

基　　金：国家星火计划资助项目(2013GAD650007);辽宁省农业攻关成果转化项目(2014210003)

摘　　要：为保证温室作物在北方寒冷季节正常生长,在温室中设置了太阳能墙体辅助加温系统,而散热系统是加温系统的重要组成部分。为研究影响散热系统性能主要结构参数的主要因素,简化模型并选取该散热系统的管径、管间距、流体温度为研究对象,各采用3个水平参数,采用正交法进行实验,基于CFD进行数值模拟,初始条件为：内部温度10℃,外界空气温度-15℃,2m深土壤温度13℃。结果表明,1土壤500mm深处温室地温变化不明显,气温和土壤表面温度变化比较大;2加温之后90min内温度急剧上升,随后的30min内温度呈缓慢上升趋势,温度场逐渐均匀,温度大约提高了6℃,与不加温温室相比空气温度提高了5～6℃,土壤温度提高了3℃左右;3在选用同样管数条件下,影响室内温度的主次顺序为：温度、管间距、管径,最佳结构参数确定为管径22mm、管间距200mm。In order to ensure the crops growth in greenhouse during the northern cold season,solar energy wall heating system was set up in greenhouse,and the cooling system was an important part.In order to study the main factors impacting on the main performance of the cooling system,the model was simplified and pipe diameter,pipe spacing and the fluid temperature were chosen as the study objects.3levels ofeach factor were selected,experiments were conducted by orthogonal method and the numerical simulation was based on Computational Fluid Dynamics（CFD）.The internal temperature of the initial conditions was10 ℃,the outside air temperature was-15℃,and the soil temperature at 2mdepth was 13℃.The results showed that,1Soil temperature of 500 mm depth changed a little while the simulated air and soil temperature changed relatively large;2The temperature rose sharply after heating in the first 90 minutes,and the temperature showed a slowly rising trend during the following 30 min until the temperature field became uniform.Finally the temperature was increased by approximately 6℃,the air temperature in greenhouse with solar energy wall assisted system was increased by 5~6℃and soil temperature was increasedby about 3 ℃ compared with none heating system greenhouse;3Under the condition of the same number of tubes,the primary and secondary order of the main influencing parameters was the fluid temperature,the pipe spacing and the pipe diameter.The optimum structural parameters were determined as the diameter of 22 mm and the spacing of 200 mm.

关 键 词：太阳能墙体辅助加温系统 散热系统 空气温度 土壤温度 数值模拟 

分 类 号：S625[农业科学—园艺学]