不同透光率下塑料连栋温室覆盖层传热模型的研究

为研究温室覆盖材料传热特性对温室生产影响,建立塑料连栋温室覆盖层的热环境模型,借助MATLAB软件,采用Runge-Kutta法对温室覆盖层的热环境模型求解,探讨覆盖材料透光率τc分别为0.8、0.75和0.7时对塑料连栋温室覆盖层传热模型的影响。结果表明,随着覆盖材料透光率的下降,覆盖层模拟温度明显降低,覆盖层模拟温度的精度也随之下降;当覆盖层的透光率τc降到0.7以下时,会严重影响覆盖材料对太阳辐射的作用。将τc=0.7作为覆盖层透光率的临界值,指导温室生产实践。

Study on heat transfer model of covering layer of multi-span plastic greenhouse with different transmission rates

Study on the heat transfer characteristics of the greenhouse cover material impact on the greenhouse production.In this paper,a thermal environment model of covering layer of multi-span plastic greenhouse has established,and it was solved by used with the MATLAB software and the Runge-Kutta method.The focus of research was the impact of the light transmittance of cover material on the model,and different transmission rates were 0.8,0.75 and 0.7.The results showed that: with the decline of covering material transmission rates,covering layer simulated temperature decreased significantly,and the accuracy of simulated temperature also felled.When the transmission rate dropped to 0.7 below,the cover material would seriously affected the role of solar radiation.This study used the transmission rate of 0.7 as a critical value for covering layer.It can be used to guide the greenhouse production practice.