温室传热水道与土壤换热强度影响的数值分析

Numerical Analysis of the Influence of Solar Greenhouse Heating Channels and Soil Heat Transfer Intensity in Cold and Arid Areas

以呼和浩特市某日光温室铺设的传热水道为研究对象,为提供传热水道在土壤中铺设间距、深度的准确依据,利用CFD数值模拟技术对传热水道在不同供水温度(30、40、50℃)、不同埋管深度(30、40、50cm)、不同管道间距(20、40、50cm)的情况时对温室土壤的换热强度进行研究与分析。结果表明:埋管深度越深对土壤地面温度影响越小,管道间距越宽则土壤的温度分布越分散,使土壤不容易达到温度扩散的饱和值,管温越高对管道以下的土壤影响越大,造成资源浪费;当埋管深度为30cm、管间距为20cm时,土壤的换热效果最佳。研究结果可为温室传热水道对土壤加热提供理论参考。

Taking the hot water channel laid in a solar greenhouse in Hohhot as the research object,in order to provide an accurate basis for the spacing and depth of the water channel in the soil,this paper uses CFD numerical simulation technology to study and analyze the heat transfer strength of the greenhouse soil at different water supply temperatures(30℃,40℃,50℃),different buried pipe depths(30cm,40cm,50cm),and different pipe spacing(20cm,40cm,50cm).The results show that the deeper the depth of the buried pipe,the smaller the impact on the soil ground temperature,the wider the pipe spacing,the more dispersed the temperature distribution of the soil,so that the soil is not easy to reach the saturation value of temperature diffusion,and the higher the pipe temperature,the greater the impact on the soil below the pipeline,resulting in a waste of resources.When the buried pipe depth is 30cm and the pipe spacing is 20cm,the heat exchange effect on the soil is the best,which provides a theoretical reference for the greenhouse water channel to heat the soil.