Resumo

DEL BOSQUE-VILLARREAL, G. Arturo; RODRIGUEZ-GARCIA, Raúl; ZERMENO-GONZALEZ, Alejandro  e  JASSO-CANTU, Diana. Evaluation of a physical model of climate simulation in a greenhouse with natural ventilation. Agrociencia [online]. 2012, vol.46, n.5, pp.427-440. ISSN 2521-9766.

Greenhouses are being increasingly used in México; in 2009 greenhouses covered an area of 10 000 ha, 60% of them were made of plastic. In a large part of México long periods of hot weather prevail, so that the use of natural ventilation is an option for efficient climate control to avoid crop damage caused by heat. Simulation models can be used as tools in the design and control of greenhouses. The objective of this study was to evaluate a physical model for simulating temperature and relative humidity in a greenhouse. The model was constructed starting from a simplified balance of energy, and simulation was performed based on outside climate. The evaluation was carried out at Galeana, Nuevo León, México, in July 2009 and May 2010 in a greenhouse with natural ventilation, in which 4 ha of tomatoes (Solanum lycopersicum L.) were grown. The input variables of the model were outside temperature and relative humidity, solar radiation, wind speed and direction. Analysis of the results of the 2009 and 2010 evaluations indicate that the model suitably simulates the greenhouse climate; a better fit was found for estimation of temperature (r=98 and 0.95; modeling efficiency = 0.92 and 0.83) than for relative humidity (r=0.96 and 0.91; modeling efficiency=0.82 and 0.71). The model was less accurate in the simulation of cold night temperatures (r=0.96; modeling efficiency=0.60) when the greenhouse is closed.

Palavras-chave : energy balance; physical model; Solanum lycopersicum L.

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