温室多层覆盖传热的数值模拟与验证

Numerical simulation and experimental verification of heat transfer through multi-layer covering of greenhouse

为准确地掌握温室中不同材料和不同使用条件下多层覆盖的传热和保温特性,该文在前人研究的基础上建立了温室多层覆盖传热的理论模型,并开发了模拟其传热过程与计算传热量和传热系数的计算机程序,可根据覆盖材料的红外辐射特性、覆盖层构造参数以及工作环境等条件,定量分析覆盖层的传热情况,得出传热量以及传热系数的理论计算值。实测结果表明,传热量以及传热系数的理论计算值与试验测定值较为一致,表明该多层覆盖传热的理论模型具有较高的准确性。

In order to grasp the properties of heat transfer and keep various multi-layer covering at different conditions in greenhouse exactly,a model of heat transfer through greenhouse multi-layer covering was developed in this study.A computer program was designed for simulating its heat transfer process,calculating heat transfer capacity and heat transfer coefficient of covering.Heat transfer flux density and heat transfer coefficient of covering could be simulated and forecasted by using this model,based on the thermophysical characteristics of covering,the construct parameters of greenhouse and the environment conditions,etc..The measurement results indicated that the simulated values of heat transfer flux density through multi-layer were in accordance with the values from experiments.This model is simple and accurate for quantitative analysis of heat transfer through multi-layer covering of greenhouse.