Simulations and Analysis of Ventilation in the Double-layer-arch Greenhouse Based on the CFD in Jianghuai Region

doi:10.11924/j.issn.1000-6850.2014-2271

Abstract

Abstract: In recent years, the double-layer arch greenhouse in Jianghuai region has come into being, but the shed-type has not been determined, the micro-climate issues in the production of the greenhouse need to be studied further. This paper introduced the application and research progress of the double- layer arch greenhouse and built a 3D model for the double-layer arch by using AutoCAD and ProE, then simplified the 3D model into 2D model and divided it on the basis of structured grids. In addition, the ground and plastic film covering of the external shed was handled as temperature wall, and the internal shed was regarded as thermal transmission wall. According to the ventilation effect, numerical simulations were done through tubular and single-sided ventilation respectively for double arch greenhouses. The results showed that temperature in inner layer and internal shed was uniformly distributed and heat in greenhouses could be taken away under the circumstances of tubular ventilation, which was beneficial to the structural stability of double-layer shed and guaranteed the conspicuous ventilation effect. Temperature showed a ladder-like increase from the entrance of internal shed to the other side under the circumstances of ventilation of single- sided. The highest inner temperature could reach 329 K and the maximum temperature difference could be 29 K. The heat conservation showed a uniform distribution and stayed almost stable, so tubular ventilation did well to the double-layer greenhouses. The simulation and analysis result provided a necessary theoretical basis for further promotion and study of the double-layer arch greenhouses.

References

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[1] 汤庆.基于 Ansys Workbench双层拱架塑料大棚结构设计及流场模拟[D].合肥:安徽农业大学,2012.
[2] 伍德林,汤庆,朱世东,等.新型双层塑料大棚外层棚结构设计与ANSYS稳定性分析[J].上海农业学报,2012,28(4):100-105.
[3] 钱剑锐,凡改恩.双层塑料大棚保温性能及对枇杷生长发育的影响[J].浙江农业科学, 2011(4):775-777.
[4] 夏大鸣.单层与双层塑料大棚的性能和栽培效果比较[D].长沙:湖南农业大学,2005.
[5] 胡绵好.长沙地区单、双层塑料大棚性能和栽培效果的研究[D].长沙:湖南农业大学,2004.
[6] Fatnassi H, Boulard T, Poncet C, et al. Optimisation of greenhouse insect screening with computational fluid dynamics[J]. Biosystem Engineering,2006,93:301-312.
[7] Fatnassi H, Leyronas C, Boulard T, et al. Dependence of greenhouse tunnel ventilation on wind direction and crop height[J]. Biosystems Engineering,2009,103:338-343.
[8] Majdoubi H, Boulard T, Fatnassi H, et al. Airflow and microclimate patterns in a one- hectare canary type greenhouse:an experimental and CFD assisted study[J].Agric. Forest Meteorol,2009,149:1050- 1062.
[9] Kittas C, Bartzanas T. Greenhouse microclimate and dehumidification effectiveness under different ventilator configurations[J].Building and Environment,2007,42(10):3774- 3784.
[10] Abbes M, Farhat A, Mami A. Pseudo bond graph model of coupled heat and mass transfers in a plastic tunnel greenhouse[J].Simulation Modeling Practice and Theory,2010,18(9):1327-1341.
[11] 程秀花,毛罕平,伍德林,等.玻璃温室自然通风热环境时空分布数值模拟[J].农业机械学报,2009,40(6):179-183.
[12] 佟国红,李保明, David M,等.用 CFD方法模拟日光温室温度环境初探[J].农业机械学报,2007,23(7):178-185.
[13] 王健,汪小旵,丁为民.风压通风的单栋温室内部流场的 ANSYS CFD模拟[J].农业机械学报,2007,38(3):114-116,121.
[14] 吴飞青,张立彬,胥芳,等.CFD技术在温室通风中的应用[J].农机化研究,2008,6:1-5.
[15] Liu Yanzheng, ChenJing, Teng Guanghui. 3D- CFD method driven with the dynamic data using real- time online monitoring for temperature simulation of greenhouse[J].Sensor Letters,2011,9(3): 947-957.
[16] 胥芳,张立彬,陈教科,等.玻璃温室小气候温湿度动态模型的建立与仿真[J].农业机械学报,2005,36(11):102-105,131.
[17] 孙怀卫,杨金忠,王修贵.塑料大棚气流场模拟及作物蒸腾量计算[J].农业工程学报,2011,27(11):236-241.
[18] 程秀花,毛罕平,伍德林.温室自然通风研究进展[J].安徽农业科学, 2009,37(8):3803-3805,3856.
[19] 程秀花,毛罕平,倪军.温室环境-作物湿热系统 CFD模型构建与预测[J].农业机械学报,2011,42(2):173-179,157.
[20] 韦彦,赵景文,张正伟,等.灌溉方式对温室内主要环境因子及黄瓜生长发育的影响[J].内蒙古农业大学学报,2007,28(3):204-208.
[21] 何芬,马承伟.温室湿度环境的主成分分析人工神经网络建模研究[J].上海交通大学学报:农业科学版,2008,26(5):428-431.
[22] Boulard T. Computer fluid dynamics prediction of climate and fungal spore transfer in a rose greenhouse[J]. Computers And Electronics In Agriculture, 2010,74(2):280-292.
[23] Molina Aiz F D, Valera D L, Alvarez A J, et a1. A wind tunnel study of airflow through horticultural crops: Determi- nation of the Drag Coefficient[J]. Biosystems Engineering,2006,93(4):447-457.
[24] Misteio A, Arcidiacono C, Picuno P, et al. Computational analysis of ventilation in greenhouses at zero- and- windspeeds[J]. Agricultural and Forest Meteorology,1997,88:121-135.
[25] Ould Khaoua S A, Bournet P E, Migeon C, et al. Analysis of greenhouse ventilation efficiency based on computational fluid dynamics[J]. Biosystems Engineering,2006,95 (1), 83-98.
[26] Teitel M, Ziskind G, Lirana O, et a1. Effect of wind direction on greenhouse ventilation rate, airflow patterns and temperature distributions[J]. Biosystems Engineering,2008,101(3),351-369.
[27] Majdoubi H, Boulard T, Fatnassi H, et a1. Airflow and microclimate patterns in a one-hectare Canary type greenhouse: an experimental and CFD assisted study[J]. Agricultural and Forest Meteorology,2009,149(6-7):1050-1062.