Event-triggered control for greenhouse temperature under natural ventilation based on computational fluid dynamics

Abstract

In this paper, the event-triggered control for greenhouse temperature based on Computational Fluid Dynamics (CFD) is investigated. To overcome the deficiency of sensor which can only represent the temperature value of some points inside the greenhouse, CFD technology is used to simulate and output the temperature field data of the entire greenhouse. Furthermore, in order to reduce the network resource consumption, the event-triggered mechanism is adopted in CFD simulation output-controller channel. When the greenhouse temperature meets the event-triggered condition, the simulated data is transmitted to the controller. Moreover, multi-objective particle swarm optimization (MOPSO) is used to design the controller to solve the contradiction between energy consumption and control accuracy in the control process. Finally, a numerical simulation example is provided to illustrate the effectiveness of given event-triggered scheme for greenhouse temperature under natural ventilation based on CFD simulation. The simulation results show that the control scheme given in this paper can effectively regulate the greenhouse internal temperature and meet the control requirements.

Influence of the Height in a Colombian Multi-Tunnel Greenhouse on Natural Ventilation and Thermal Behavior: Modeling Approach

“…On the contrary, the main objective is to make an analysis of the ventilation phenomenon under the most critical condition that can occur in a real scenario and that is in empty conditions and under the most extreme climatic conditions [37,47]. This is an approach that is still valid and continues to be implemented in a significant number of studies carried out in various countries [48][49][50][51]. In addition, as different types of horticultural, ornamental, aromatic and medicinal crops are grown in the region, the analysis developed in this study can be applied to any type of crop.…”