The study on heat transfer model of covering layer of multi-span plastic greenhouse

摘要

In order to study the heat transfer characteristics of covering layer of multi-span greenhouse, took the temperature condition as the main research object, the basic theory of heat transfer and mass transfer and the local climate condition as bases, established the thermal environmental model of plastic greenhouse covering layer. Used the mathematical software MATLAB, and the Runge - Kutta method to solve the thermal environment model, and the experimental data was used to test this model. The results showed that: the early winter, greenhouse production, the standard error of estimate RMSE was 0.82 between the covering layer simulation temperature and the measured temperature, the average absolute error within ±1.08 a????; the winter, greenhouse idle stage, the standard error of estimate RMSE was 0.46 between the covering layer simulation temperature and the measured temperature, the average absolute error within ±0.38 a????; the model had good simulation accuracy.