基于CFD的两连跨日光温室热环境模拟  

Simulating thermal environment in a two-span solar greenhouse using CFD

作　　者：于威[1] 刘文合[1] 白义奎[1] 丁小明 YU Wei;LIU Wenhe;BAI Yikui;DING Xiaoming(College of Water Conservancy,Shenyang Agricultural University,Shenyang 110866,China;Chinese Academy of Agricultural Engineering,Beijing 100125,China)

机构地区：[1]沈阳农业大学水利学院,沈阳110866 [2]农业农村部规划设计研究院,北京100125

出　　处：《农业工程学报》2023年第16期215-222,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：辽宁省重点研发项目:北方寒区生态智能型高效节能日光温室设计与装备研发(2021JH2/10200022);2021年辽宁省民生科技计划(农业攻关及产业化);北京市设施蔬菜创新团队项目(BAIC01-2023);农业农村部规划设计研究院农规英才项目(QNYC-2021-02)。

摘　　要：相比单跨日光温室,两连跨日光温室具有单位面积建造成本低,土地利用率高等优势,为深入了解两连跨日光温室热环境性能,该研究基于计算流体动力学(computational fluid dynamics,CFD)构建了相同结构参数和构造材料的单跨和两连跨日光温室热环境模型。通过试验测试两连跨日光温室内的环境温度和各围护结构表面热流,并与CFD模拟的温度场进行对比,结果表明模拟数据与实测数据吻合度较高。在此基础上,基于该CFD模型分别对两连跨和单跨日光温室热环境进行模拟,并提取各围护结构表面热流和温度、土壤温度和空气温度进行对比分析。结果表明,在相同外界气候条件下,两连跨日光温室比单跨日光温室夜间气温高1.7~3.8℃,土壤温度高2.9~3.0℃,墙体内表面温度高2.9~7.9℃;两连跨日光温室的土壤和墙体在夜间,持续向南侧棚室放热,热流稳定,热流密度分别为7.11~8.59、12.65~15.19 W/m^(2),分别比单跨日光温室土壤、墙体表面热流密度高0.76~2.42、9.71~14.36 W/m^(2)。相比单跨日光温室,两连跨日光温室地表土壤温度和室内气温波动较小,热环境调节能力明显提升。该研究结果为两连跨日光温室的结构优化、耕种管理等提供参考。Two-span Chinese solar greenhouses(TSCSG)are commonly used in China,due to the low construction cost and high rate of land utilization.There are two sheds with one back wall in the TSCSG,compared with the traditional solar greenhouses(single-span Chinese solar greenhouses,SSCSG)with one back wall and one shed.The two sheds can be located both on the south side or separately on the north and south sides of the back wall.In terms of the addition of a north shed behind the back wall,there are different significant extreme temperature values and distribution characteristics of the walls,and soil in the TSCSG,compared with the SSCSG.In this study,the thermal environment performance of TSCSG was focused mainly on the heat transfer in the TSCSG.A three-dimensional transient state model was established for temperature environment in the TSCSG and SSCSG using computational Fluid Dynamics(CFD)on the Fluent platform.A series of experiments were carried out to collect the indoor temperature and Heat flux of the enclosure structure in the TSCSG.The ANOVA(analysis of variance)and isoscedasticity t-test method were then employed to analyze the significance of differences between simulated and test data.Consequently,the test verified that there was no significant difference between simulated and measured data.Accordingly,the CFD simulation model was employed to calculate the indoor temperature and heat flow in the TSCSG and SSCSG.Consequently,the following results were obtained after CFD simulation.Under the same external climate conditions,the nighttime indoor temperature,the soil temperature,the inner surface temperature of the wall were 1.7-3.8℃,2.9-3.0℃,and 2.9-7.9℃higher in the TSCSG than that in the SSCSG,respectively.The soil and walls of TSCSG released the heat towards the south side shed at night with a stable heat flow continuously,but nothing occurred in the SSCSG.Moreover,the heat flow rates densities of walls and soil in the TSCSG were 7.11-8.59,and 12.65-15.19 W/m^(2),respectively,which were 0.76-2.42,and 9.7

关 键 词：温室 土壤 温度 三维瞬态模拟 单跨日光温室 热环境分析 FLUENT 热流分布 

分 类 号：S625[农业科学—园艺学]