Resumo

CASTANEDA-MIRANDA, Rodrigo; VENTURA-RAMOS, Eusebio Jr.; PENICHE-VERA, Rebeca del R.  e  HERRERA-RUIZ, Gilberto. Analysis and simulation of a greenhouse physical model under weather conditions of the central region of México. Agrociencia [online]. 2007, vol.41, n.3, pp.317-335. ISSN 2521-9766.

The use of greenhouses for vegetable production has expanded rapidly in recent years in México. The most important aspect for the success of these agro-businesses is the improvement of production efficiency, higher quality and productivity, which are related to specific climatic conditions of each region. The present study introduces the analysis and simulation of a mathematical model of greenhouse climate. The model is formulated on basic principles of mass and energy transfer processes, and simulates the greenhouse air, soil, roof and crop temperatures, as well as relative humidity. The dynamic simulation of the mathematical model was made using the SIMULINK tool of MATLAB software. The simulation results were calibrated and validated with the measured data collected in a 1000 m2 experimental greenhouse developed at the University of Querétaro. The results from the validation were prediction equations for the roof temperature (R2=0.855), inner air temperature (R2=0.964), crop temperature (R2=0.835), soil temperature (R2=0.714) and relative humidity (R2=0.960). The magnitude of the coefficients indicates that the model can be used to predict the greenhouse climate with a high level of confidence, and it is a tool for supporting the analysis of the necessary conditions for greenhouse vegetable production under climatic conditions of the Central Region of México.

Palavras-chave : Energy balance; greenhouses; climatic model; dynamic simulation.

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