A temperature and vent opening couple model in solar greenhouses for vegetable cultivation based on dynamic solar heat load using computational fluid dynamics simulations
A temperature and vent opening couple model in solar greenhouses for vegetable cultivation based on dynamic solar heat load using computational fluid dynamics simulations
复制标题
DOI：
10.1111/jfpe.14240
复制
发表时间：
2022-12
影响因子：
3
通讯作者：
Qiqi Fu;Xinxing Li;Guo-fu Zhang;Xiang Li
中科院分区：
文献类型：
--
作者：
Qiqi Fu;Xinxing Li;Guo-fu Zhang;Xiang Li
在动态太阳热负荷条件下，日光温室微气候控制技术的应用，对当前日光温室能耗和清洁效率的研究具有重要意义。特别是，日光温室使用自然通风，用于温室内外的能量和热量的快速交换。在这项研究中，我们提出了自然通风模型和计算流体动力学（CFD）模型之间的耦合，以研究日光温室通风与温度之间的关系，从而更深入地了解温室通风需求。利用CFD模拟了在动态太阳热负荷下通风口对日光温室微气候的影响，提出了自然通风模型与CFD模型的耦合，研究了日光温室通风与温度的关系。此外，我们还分析了每日和每年的温室微气候，以更深入地了解温室通风需求。结果表明，室外风速和通风口开度对温室通风量和温度的影响显著，温室通风量与室外风速呈线性关系。当通风口开度减小时，室外风速对通风量的影响不大，而室内温度随着室外风速的增大而降低。温室内的平均温度被观察到受到风速小于3 m/s的极大影响。同时，打开温室通风口导致室内温度下降，其中打开度小于60%时降低幅度最大（最大温度漂移被确定为9.33%）。实际应用具有节能和减少污染的能力，日光温室对中国和全球农业产业的贡献至关重要。此外，它们还与现代农业竞争力的提高有关，特别是在目前化石燃料和传统能源的成本和污染迅速增加的时代。该研究为动态太阳热负荷下通风口自然通风控制室内空气温度提供了基本参考。研究结果可作为日光温室生产管理的理论依据，对后续温室环境的自动化和智能化控制具有重要的现实意义。
The application of microclimate control technology in solar greenhouses under a dynamic solar heat load is of great significance for current research on energy consumption and clean efficiency in greenhouses. In particular, solar greenhouses use natural ventilation for the rapid exchange of energy and heat inside and outside the greenhouse. In this study, we proposed a coupling between the natural ventilation model and the computational fluid dynamics (CFD) model to investigate the relationship between ventilation and temperature in solar greenhouses, thus providing a more in‐depth understanding of greenhouse ventilation demands. The influence of vents on the greenhouse microclimate was simulated under dynamic solar thermal loads using CFD to propose a coupling between the natural ventilation model and the CFD model to investigate the relationship between ventilation and temperature in solar greenhouses. Furthermore, we analyzed the daily and annual greenhouse micro‐climates to provide a more in‐depth understanding of greenhouse ventilation demands. Results highlighted the impact of the outdoor wind speed and vent opening on greenhouse ventilation rates and temperatures, with a linear relationship between greenhouse ventilation rates and outdoor wind speed. The outdoor wind speed had little effect on the ventilation rate for reduced vent openings, while the indoor temperature decreased as outdoor wind speed increased. The average temperature in the greenhouse was observed to be greatly affected by wind speeds less than 3 m/s. Simultaneously, opening the greenhouse vent resulted in a fall in indoor temperatures, with openings less than 60% causing the greatest reduction, (the maximum temperature drift was determined as 9.33%).Practical ApplicationsWith the ability to conserve energy and reduce pollution, solar greenhouses are crucial to China's contribution and the global agricultural industry. Moreover, they are associated with improvements in the competitiveness of modern agriculture, particularly in the current era of rapidly increasing costs and pollution from fossil fuels and traditional energy. This study provides a basic reference for the natural ventilation of vents in the control of indoor air temperatures under dynamic solar thermal loads. The results can be used as a theoretical basis for the production management of solar greenhouses, and have an important practical significance for the subsequent automation and intelligent control of greenhouse environments.