基于有限元分析的日光温室土质墙体温度场模拟与验证

Simulation and Verification of Greenhouse Soil Wall Temperature Field by FEM Analysis

研究日光温室墙体中温度梯度及其变化规律对于日光温室墙体的蓄热保温性能分析评价、设计与建造有着重要的意义。2012年12月至2013年2月，采用自制多点温度测试仪，对山东泰安地区日光温室土质墙体的温度进行采集，并与ANSYS有限元模拟结果进行比较，发现温度场实测结果与模拟结果相吻合。进一步模拟结果表明，墙体蓄热/放热层一天中呈周期性变化，保温隔热层随外界温度变化较小，墙体下部温度较高，且在水平方向上温度梯度变化较小，在10～14℃持续时间长且稳定；距墙体内表面0．2 m处温度最高，并沿墙体厚度方向逐渐平缓降低，墙体外表面温度最低。基于模拟结果，对山东省泰安地区日光温室土质墙体进行结构优化，其最小厚度应为2．2 m，蓄热/放热层为0～0．5 m，保温隔热层为1．3～1．7 m。

It was significant to study the temperature gradient and its change rule for evaluation of heat prevention performance , design and construction of greenhouse wall .The temperature data of greenhouse soil wall in Taian region were measured through multi -point temperature test instrument from December 2012 to February 2013 .The measured results coincided with that obtained through ANSYS FEM simulation .The fur-ther simulation results showed that the temperature of heat release and absorption layer in the wall changed pe -riodically in a day , while that of heat preservation and insulation layer changed smaller .The temperature at the wall bottom was higher , and changed a little in the horizontal direction , which was stable at 10~14℃for long time.The temperature was the highest at the place 0.2 m away from the inner surface of wall , and re-duced gently along the direction of wall thickness; the outer surface of the wall had the lowest temperature . Based on the simulated and measured results , the optimized soil wall of greenhouse in Taian area showed that the minimum thickness should be 2.2 m, including 0~0.5 m of heat release and absorption layer and 1.3~1 .7 m of heat preservation and insulation layer .