以热传导流入肋片热量与通过空气与肋片间的对流所散出的热量及湿空气凝结所需热量之和相等作为条件, 构建了可以实际反映温室环境影响下的植物生长用LED灯具散热结构的温度分布模型。通过实验结合仿真模拟, 实现对温室环境的物理仿真模型的建立, 并以模型得到了灯具处于最为恶劣的工况下的空气物理参数。结合具体的空气物理参数以及所构建的数学模型, 计算出了悬挂在温室中部2.5 m高度处的150 W植物生长用LED灯具在最为恶劣的工况下的散热结构关键节点的温度数值, 并运用红外热像仪, 对关键温度节点进行了收集。数据表明, 计算值与实验值及仿真值的数值误差均不超过5%, 验证了模型的正确性, 对具体的植物生长用LED灯具的散热结构的设计具有积极的指导作用。

A mathematic model of LED heatsinks in greenhouses was established by the condition that the heat conducted into the fin heat equals the total heat from the air convection and the condensation of wet air. The air physical parameters under the worst condition were obtained by the physical simulation model of the greenhouse environment established by experiment and simulation. After obtaining the specific air physical parameters, combined with the constructed mathematical model, the temperature values of the key nodes of a 150 W plant growth LED lamps heatsink suspended at the height of 2.5 m in the middle of the greenhouse were calculated in the worst case. The correctness of the model was verified by experiment and simulation, the data show that the relative error is not more than 5%, thus this has a positive effect for the design of LED lamps heatsink for greenhouse.