Modeling and regulation of the internal climate of an agricultural greenhouse

Abstract

This paper presents the modeling and control of the indoor climate of greenhouses. Indeed, in order to predict the internal climatic parameters of an agricultural greenhouse such as air temperature and relative humidity, it is necessary to model the greenhouse using Matlab / Simulink software. This model describes the transfer of heat and water vapor inside the greenhouse as a function of weather conditions (wind speed, outside temperature, solar radiation, outside humidity, location and structure of the greenhouse, season, etc. etc). Consequently, the all-or-nothing (TOR) regulation has been adapted to the greenhouse model in order to regulate the temperature and humidity of the soil to a precise setpoint. When the plant's water and ventilation needs reach a well-defined threshold, usually chosen by the farmer, the TOR regulator sends the control signals to the solenoid valve to start the irrigation and also to the fan to cool the indoor climate of the greenhouse.