基于CFD的下沉式日光温室保温性能分析

Analysis on insulation performance of sunken solar greenhouse based on CFD

为了深入了解下沉式日光温室的保温性能,该文基于非稳态传热模型,采用计算流体力学(computational fluid dynamics,CFD)软件模拟盖帘状态下下沉式日光温室的温度场,并采用试验对CFD模拟温室内的温度场进行验证,验证结果表明,CFD对下沉式日光温室盖帘状态下温度场的模拟具有较高的可信度。为了提高下沉式日光温室的保温效率,使用CFD软件对不同盖帘时间的下沉式日光温室的温度场进行模拟,并分析其对热能分布的影响。结果表明,不同盖帘时刻对下沉式日光温室夜间温度的影响差异显著;在午后弱光、室内外温差较大条件下,提前盖帘可以显著提高日光温室内夜间温度。该研究为CFD在下沉式日光温室研究中的应用及下沉式日光温室盖帘管理提供参考。

To learn more about sunken solar greenhouse insulation performance, the air temperature field inside sunken solar greenhouse with cover curtain was simulated using computational fluid dynamics （CFD）based on unsteady heat transfer model in sunlight greenhouse, and experiment was conducted to validate the simulated results. The validation results showed that simulated results of CFD about air temperature field with cover curtain had a higher reliability. In order to improve heat preservation rate of sunken solar greenhouse, its air temperature field under different cover curtain time was simulated using CFD software and effect on heat energy distribution was analyzed. The results showed that effect of different cover curtain time on air temperature at night inside sunken solar greenhouse was significant, under the conditions of low light and large air temperature difference of inside and outside greenhouse afternoon, night-time air temperature could be significantly improved by cover curtain earlier. This study can provide a more reference for the CFD application and cover curtain management in sunken solar greenhouse.