A Dynamic Model for Simulation of Thermal Behavior in Single Span Greenhouse

One of the best ways to provide optimum conditions to the crop is the development of accurate greenhouse models for inside environment control. In this study a mathematical model was developed for computing transmitted total solar radiation (beam, diffused and ground reflected), for the single span greenhouse, without crops, was performed in Tabriz University. Also a dynamic model was developed to predict the all internal temperatures of the greenhouse including greenhouse inside air, soil surface and north wall temperature. The input parameters of the model were the measured meteorological conditions and the thermo-physical properties of the greenhouse components. Results showed that soil surface heat exchange has a positive contribution to the internal air temperature. Comparisons between the predicted and measured results showed close agreement for greenhouse air temperature. The correlation coefficient and mean percentage error for this model were calculated as 0.99 and -3.62%, respectively. Results also showed a considerable amount of the incident radiation was lost to outside the greenhouse by convection and radiation.