1.Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China
2.Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures of Ministry of Agriculture and Rural Affairs,Beijing 100081,China
3.Institute of Facility Agriculture,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China
4.Western Agriculture Research Center,Chinese Academy of Agricultural Sciences,Changji 831100,China
To investigate the influence of multi-layer coverage on the typical seasonal thermal performance of large-span greenhouse, a double-film large-span greenhouse model was constructed based on computational fluid dynamics (CFD) model. The distribution law of the internal heat environment in the greenhouse under two extreme environments of no wind in summer and wind in winter was investigated and were then compared and analyzed with the thermal environment distribution of a single-film greenhouse. The results show that: The constructed CFD model accurately represents the temperature distribution inside the double-film large-span greenhouse, with an average relative error of 1.53% and a root mean square error of 0.75. During summer conditions, the double-film large-span greenhouse shows higher temperature accumulation in the buffer area, leading to an average temperature of about 1 °C higher than that of the single-film greenhouse. Moreover, during winter conditions, the double-film large-span greenhouse achieves a larger winter difference inside and outside, with an average temperature 5.1 °C to 10.6 °C higher than that of the single-film greenhouse. To sum up, the double-film large-span greenhouse is more suitable for the climatic environment of the Shouguang area.
求解器选择ANASYS FLUENT 2021R2,进行三维稳态求解,离散格式为二阶迎风格式,湍流模型选用标准k-epsilon模型,开启能量模型,为了加载太阳辐射对拱棚热环境的影响,选用DO辐射模型和Solar Ray Tracing模型,考虑空气热浮升力的影响,采用Boussinesq模型[15],设置操作温度为外界环境温度,使用SIMPLE算法进行求解,求解时能量残差收敛标准设为10-6,其他变量残差收敛标准设为10-4,已有研究[16]表明,此收敛标准下的仿真结果具有可靠的准确度。
ZhouC J. Notes on Dr. Zhou’s investigation (75): Practice and innovation of large-span insulated plastic greenhouses (Part Ⅰ) [J]. Agricultural Engineering Technology, 2017, 37(34): 20-27 (in Chinese)
WuY, LiJ M. Analysis on temperature and light variation properties of large-span asymmetric plastic greenhouses in typical seasons[J]. Journal of China Agricultural University, 2019, 24(10): 125-135 (in Chinese)
LiS L, HuoY J, SunZ Q. Study on the temperature characteristics in super-span plastic covered tunnel greenhouse with simple thermal screen of different layers[J]. Journal of Henan Agricultural University, 2008, 42(6): 621-624 (in Chinese)
LiP P, HuY G. Thermal preservation effect of multi-film covering and heating wire in plastic greenhouses in winter[J]. Transactions of the Chinese Society of Agricultural Engineering, 2002, 18(2): 76-79 (in Chinese)
WangJ Q, ZhaoY P, ZhangB L. Effect of heat preservation and energy-saving by applying multi-layer thermal screen in greenhouse [J]. Transactions of the Chinese Society of Agricultural Engineering, 2005, 21(8): 118-121 (in Chinese)
YangD W, JingH W, JingW T, HeB, ZouZ R, BaoE C, CaoY F. Comparative analysis of thermal performance of fabricated solar greenhouses with different wall materials[J]. Journal of China Agricultural University, 2023, 28(10): 194-205 (in Chinese)
QieL J, HanJ H, LiY. Thermal performance analysis and evaluation on solar greenhouse with assembled heterogeneous composite wall[J]. Journal of China Agricultural University, 2023, 28(4): 159-169 (in Chinese)
ChenF, SunW T, YuW Y, WeiX M, ZhouB C, LiY L, GuoW Z. Analyzing light and thermal environment and insulation performance of a multi-span greenhouse with external insulation[J]. Transactions of the Chinese Society of Agricultural Engineering, 2023, 39(6): 194-203 (in Chinese)
YuW, LiuW H, BaiY K, DingX M. Simulating thermal environment in a two-span solar greenhouse using CFD[J]. Transactions of the Chinese Society of Agricultural Engineering, 2023, 39(16): 215-222 (in Chinese)
FangH, YangQ C, ZhangY, ChengR F, ZhangF, LuW, LiuH. Prediction model on air temperature in large-span greenhouse with different orientation based on CFD[J]. Journal of China Agricultural University, 2017, 22(11): 133-139 (in Chinese)
[23]
SaberianA, SajadiyeS M. The effect of dynamic solar heat load on the greenhouse microclimate using CFD simulation[J]. Renewable Energy, 2019, 138: 722-737
ZhaoR S, CaiZ L, YangZ, HongT T, ZhangZ. Effect of side vent height on airflow, temperature and humidity in plastic greenhouse[J]. Journal of China Agricultural University, 2021, 26(3): 105-114 (in Chinese)
[26]
XuK, GuoX, HeJ M, YuB, TanJ L, GuoY. A study on temperature spatial distribution of a greenhouse under solar load with considering crop transpiration and optical effects[J]. Energy Conversion and Management, 2022, 254: 115277
ZhaoN, LiM, ZhaoS M, SongW T, ShiW. CFD simulation on the influences of pipe air supply system on airflow field and temperature field in plastic tunnel[J]. Journal of China Agricultural University, 2023, 28(8): 272-281 (in Chinese)
[29]
NebbaliR, RoyJ C, BoulardT. Dynamic simulation of the distributed radiative and convective climate within a cropped greenhouse[J]. Renewable Energy, 2012, 43: 111-129
WuC R, ChengR F, FangH, YangQ C, ZhangC. Simulation and optimization of air tube ventilation in plant factory based on CFD[J]. Journal of China Agricultural University, 2021, 26(1): 78-87 (in Chinese)
WangC Q, NiX N, WeiM, LiQ M, WangS J, CaoX. Cooling effect of plastic greenhouse with different ventilation modes based on CFD [J]. Transactions of the Chinese Society for Agricultural Machinery, 2023, 54(1): 351-356, 439 (in Chinese)
GaoZ J, SiC Q, HeF, ZhangY P, ZhuL B. CFD simulation of temperature field in root zone of solar greenhouse under the heating by hot air duct[J]. Journal of China Agricultural University, 2022, 27(11): 207-216 (in Chinese)
[36]
陆清清. 内遮阳保温幕在冬夏季对温室内部环境影响的研究[D]. 上海: 东华大学, 2022
[37]
LuQ Q. Study on the effect of internal thermal screens on the internal environment of greenhouse in winter and summer[D]. Shanghai: Donghua University, 2022 (in Chinese)
[38]
XieM X, JiaT, DaiY J. Hybrid photovoltaic/solar chimney power plant combined with agriculture: The transformation of a decommissioned coal-fired power plant [J]. Renewable Energy, 2022, 191: 1-16
ZhangY, MaC W, LiuY W, HanJ J. Numerical simulation and experimental verification of heat transfer through multi-layer covering of greenhouse[J]. Transactions of the Chinese Society of Agricultural Engineering, 2010, 26(4): 237-242 (in Chinese)
SongM J, ZhaoP, ZhangB X, ZhaoS C, ZhangJ J. Comparative analysis on environmental performance of assembled solar greenhouse with single layer and double layer shed film[J]. Journal of Chinese Agricultural Mechanization, 2018, 39(5): 68-73 (in Chinese)