Abstract
Natural flow rate and sweet peppers productivity in tropical greenhouse are improved by CFD simulation is the main objective of this research work. Most of the greenhouse types today are in the arch shape. To develop an improved greenhouse structure for the region, the arch type was built and used as the control model. Mae Sar Mai agriculture research station under the royal project foundation was selected as the field test site. Temperature sensors with data logger were installed to monitor variation of temperature inside the greenhouse. The measured temperature data were used as the boundary conditions for the CFD analysis. A new greenhouse model with two-step roof shape was designed and the air flow behavior was simulated by using CFD. Regarding CFD results the air flow rate of the new model is about 39% higher than that of old model. The maximum temperature of the new model is lower than that of the old one. The sweet paper growths in both greenhouse models were measured and compared. Results show that the new model obtains 4°C lower maximum temperature in day time, 97% in number and 90% in weight higher the first grade pepper productivity than the old one.
Highlights
IntroductionSeveral types of greenhouses with different shapes have been used for crop growing in Thailand
During the past decades, several types of greenhouses with different shapes have been used for crop growing in Thailand
The greenhouse started receiving the solar heating at 7 AM, and the heat was accumulated during the day time
Summary
Several types of greenhouses with different shapes have been used for crop growing in Thailand. These are the Ridge and Furrow, Saw-tooth, Venlo, Quonset, Gothic arch, and Tunnel shapes. Most of them were originally designed and used in the European countries These models are introduced and constructed in the northern region of Thailand. Plant production and growth in tropical countries strongly depend on the greenhouse shapes and their dimensions. They depend on the temperature, humidity, ventilation, solar heat transmission, covering materials, CO2, and so forth [1, 2]. Few of them studied the temperature, pressure and flow patterns by using the CFD analysis [12,13,14] and effect from the insect-proof screen installation [7, 15]
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