日光温室内传热筒与空气间的换热量及对气温的影响

Heat transfer effect of cylinder ektexine on air temperature in greenhouse

为探讨热风炉加热期间日光温室内的热量分布规律,根据传热学原理,分析了日光温室加温期间热风炉传热筒与空气间的热量交换量。结果表明,距离炉体越远,日光温室传热筒外壁温度越低,并对筒外壁的递减趋势进行模拟。筒外壁与温室空气间的自然对流换热量和塑料筒放热孔与室内空气的换热量相当。塑料筒上放热孔的数量越多,其与温室空气的换热量也越大。热风炉的位置对室内气温的影响较大,热风炉所在一侧的气温要明显高于远离热风炉一侧的气温,在同一剖面内,夜间加温时气温的分布规律呈现出上部气温高于下部气温,1 m以下南侧气温高于北侧气温的趋势,1 m以上有相反的趋势。通过研究,为日光温室热风炉科学合理地安装与配置提供一定参考。

According to the heat transfer principle,the heat transfer between cylinder ektexine of hot-blast stove and the air was simulated for understanding the heat distribution principle during hot-blast stove heating process in greenhouse.It showed that the cylinder ektexine temperature was decreasing along with the distance to the hot-blast stove.The heat exchanged by nature convection between cylinder ektexine and air was equivalent to that from the holes on plastic cylinder.The more holes on plastic cylinder,the greater the heat exchange to the air in greenhouse.The location of hot-blast stove had a big influence on the air temperature.The air temperature of the side which was near the hot-blast stove was higher obviously than that in the other side.At night-time,air temperature at upside was higher than that at bottom in the same section,and air temperature at the south side was higher than that at the north under 1m.But for above 1 m,it was adverse.The research is expected to provide some references for reasonable installation and disposition of the hot-blast stove.