一种垂直换热管对拱型温室大棚热环境的影响研究

STUDY ON EFFECT OF VERTICAL HEAT EXCHANGE TUBE ON THERMAL ENVIRONMENT OF HOOP GREENHOUSE

为了调节温室大棚内由于太阳辐射随昼夜变化所带来的能量不平衡问题,提出利用垂直换热管作为换热装置将白天富余的太阳辐射能传输到地下土壤中储存,夜间通过换热管将储存的能量释放在大棚内来提高棚内空气温度,剩余部分能量储存在地下土壤中用于应对阴天天气导致的太阳能供能不足的现象。实验在内蒙古新能源实验示范基地展开,建造两个同尺寸的大棚,分别记为实验组和对照组,无作物。实验结果表明:在9 d的实验期间,通过实验组与对照组比较发现,实验组大棚在夜间棚内不同位置的温度有不同程度提高,棚内空气温度最大提升3.2℃;地表温度最大提升4.4℃;地面以下10 cm处温度最大提升3.3℃,地面以下30 cm处温度最大提升1.2℃,地面以下50 cm处温度最大提升1.0℃。该实验可达到利用换热管将太阳辐射能合理分配应用的预期效果,可强化土壤的白天储能、夜间放能,将富余的太阳辐射能储存在地下土壤中来提升土壤温度,为温室大棚内热环境的调控提供新途径。

In order to adjust the balance of solar radiant energy utilization in greenhouse,In this paper,vertical heat exchange tubes are used as heat exchange devices to transfer the surplus solar radiant energy in the daytime to underground soil for storage,and release part of energy stored in underground soil through heat exchange tube to raise air temperature in greenhouse at night,and the rest of energy is stored in underground soil.The experiment was carried out in the new energy experimental demonstration base in Inner Mongolia,and two greenhouses with the same size were constructed,which were recorded as the experimental group and the control group,respectively,without crops.The experimental results showed that during the nine-day experiment,compared with the control group,the temperature of the experimental group at different positions in the night shed increased to varying degrees,and the maximum air temperature in the shed increased by 3.2℃.the maximum increase of surface temperature was 4.4℃;The maximum temperature at 10 cm underground increased by 3.3℃,the maximum temperature at 30 cm underground increased by 1.2℃,and the maximum temperature at 50 cm underground increased by 1.0℃.The experiment achieved the expected effect of reasonable distribution and application of solar radiation energy by using heat exchange tubes,strengthened the day energy storage and night energy release of soil,and stored the solar radiation energy rich in underground soil to improve soil temperature,which provided a new way for the regulation of thermal environment in greenhouses.