日光温室中土壤—空气换热器作用下热湿环境的研究

土壤-空气换热器对日光温室内空气温湿度调节具有良好的效果。为了研究日光温室中土壤-空气换热器作用下日光温室内热湿分布特性,建立了土壤-空气换热器作用下日光温室热湿环境数值模拟模型。该模型基于计算流体力学(computational fluid dynamics,CFD)方法,利用FLUENT15.0进行了稳态和非稳态的数值求解;采用组分运输模型和DO模型分别对湿度和太阳辐射进行了三维数值模拟。结果表明:模型能够对土壤-空气换热器作用下日光温室内热湿环境特性进行较准确的研究。在距日光温室地面0.5~2.5 m处,土壤-空气换热器对日光温室内空气温湿度处理具有良好的效果。

Investigation on Heat and Moisture Environment of Earth-to-Air Heat Exchanger in Solar Greenhouse

Earth-to-air heat exchanger has good effect on air temperature and humidity regulation in Solar Greenhouse. In order to study the distribution characteristics of heat and moisture in greenhouse under the action of earth-to-air exchanger in solar greenhouse, a simulation model of greenhouse and hot air environment under the action of earth-to-air heat exchanger was established. The model is based on the CFD (Computational Fluid Dynamics) method and uses FLUENT15.0 to solve the numerical solution of steady and unsteady state. The three dimensional numerical simulation of humidity and solar radiation is carried out by the component transport model and the DO model. The results show that: The model can make a more accurate study on the characteristics of the heat and moisture environment in solar greenhouse under the action of earth-to-air exchanger. The earth-to-air heat exchanger has a good effect on the temperature and humidity control of the air in the solar greenhouse at a distance of 0.5m-2.5m from the solar greenhouse.