Abstract
Sun drying is the oldest way to preserve but also to valorize and store surplus agricultural production. Nowadays, several types of dryers have been developed, but the solar greenhouse dryer is an ideal solution in our tropical countries because of its implicit and higher load capacity. The greenhouse climate depends on several factors, namely the outdoor climatic conditions (air temperature, wind speed, radiation, etc.) but also on the type of materials used to cover the greenhouse. The study was carried out on a parabolic greenhouse covered by a polyethylene film with a concrete base (absorber) which in turn is placed on the ground and will be tested under the climatic conditions of Dakar, Senegal. It is in this context of sustainable development that this work is carried out. The goal is to determine the distribution of temperatures and wind speeds in the greenhouse. The simulation was carried out using the three-dimensional computer fluid dynamics software (CFD). The turbulence method (k-ε) was used and to solve the radiation transfer equation (RTE) we introduce the discrete ordered method DO. We also add the “Solar Load Model” which gives the position of the sun and its radiations in relation to the layout of the greenhouse according to the date and time of the simulation. The simulation is carried out in a closed greenhouse and the results found can be used to improve the design and control of the greenhouse climate. Air temperatures and velocities simulation give an average of 325.95 K and 0.114 m/s respectively.
Highlights
Among the applications of solar technology we can mention solar dryer, which is useful for the development of our tropical countries, because the sun is an abundant source of energy for our continent
It is in this alternative that Computer Fluid Dynamics simulation (CFD) can be important in terms of air flow study, analysis and temperature distribution in a greenhouse
* Corresponding author: tigamposoumaila@gmail.com the effect of opening arrangements on ventilation and energy transfer in a greenhouse. These transfers can be evaluated using fluid dynamics techniques. It combines the simultaneous resolution of the radiative transfer equations (RTE) and the convective equations in order to have an overview of the resulting climate in the greenhouse [8]
Summary
Among the applications of solar technology we can mention solar dryer, which is useful for the development of our tropical countries, because the sun is an abundant source of energy for our continent. As in the drying process, air movement and heat transfers are related to air velocity It is in this alternative that Computer Fluid Dynamics simulation (CFD) can be important in terms of air flow study, analysis and temperature distribution in a greenhouse. It is used to predict air speed, determine the distribution of temperature fields, increase work performance and efficiency For this reason, several researchers have conducted CFD studies on the greenhouse. Studies on the numerical prediction of the effect of opening arrangements on ventilation and energy transfer in a greenhouse These transfers can be evaluated using fluid dynamics techniques. A fluid dynamic analysis (CFD) was digitally predicted from outdoor climatic conditions to analyze the temperature distribution within a Chinese solar greenhouse as a function of time. This work uses the same approach and the aim is to determine the distribution of temperatures and wind speeds in the greenhouse
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