Natural flow rate and sweet peppers productivity in tropical greenhouse are improved by CFD simulation is the main objective\r\nof this research work. Most of the greenhouse types today are in the arch shape. To develop an improved greenhouse structure\r\nfor the region, the arch type was built and used as the control model. Mae Sar Mai agriculture research station under the royal\r\nproject foundation was selected as the field test site. Temperature sensors with data logger were installed to monitor variation of\r\ntemperature inside the greenhouse. The measured temperature data were used as the boundary conditions for the CFD analysis. A\r\nnew greenhouse model with two-step roof shape was designed and the air flow behavior was simulated by using CFD. Regarding\r\nCFD results the air flow rate of the new model is about 39% higher than that of old model. The maximum temperature of the\r\nnew model is lower than that of the old one. The sweet paper growths in both greenhouse models were measured and compared.\r\nResults show that the new model obtains 4?C lower maximum temperature in day time, 97% in number and 90% in weight higher\r\nthe first grade pepper productivity than the old one.
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