In this study, the near wake region is defined as D ≤ 6, where D is the device diameter.
The statistical analysis performed in this study is essential in exploring and giving a detailed understanding on the most suitable RANS turbulence model to be improved, specifically on its near-wake region. Seven RANS turbulence models with a single VATT, represented by using a cylindrical object, were employed in the preliminary study. This paper presents a comprehensive statistical analysis using the Mean Absolute Error (MEA), Mean Squared Error (MSE) and Root Mean Squared Error (RMSE) on the near-wake region for shallow water application by comparing numerical solutions (i.e., different types of RANS turbulence models using Ansys Fluent) with published experimental data. At present, limited number of research has been undertaken into the characterisation of the near-wake region for a Vertical Axis Tidal Turbine (VATT) device using the Reynolds Averaged Navier Stokes (RANS) model in the shallow water environment of Malaysia. Accurate characterisation of the near-wake region is important, but it is dominated by highly turbulent, slow-moving fluid. The flow field in the near wake region (up to six turbine diameters downstream) of a tidal current turbine is strongly driven by the combined wake of the device support structure and the rotor. The performance analysis demonstrated that the drying speed of a hybrid solar dehydrator is moderately slower than traditional drying, but it provided a more hygienic drying environment and preserved the color and nutrition value of food products. Heat accumulated inside the dehydrator resulted in a temperature of 44.1 degrees Celsius which is 20 % higher than the ambient temperature. The drying performance of the dehydrator on food was evaluated and compared with traditional drying under the meteorological conditions of Panchor, Muar, Malaysia. The final design was then converted via computer-aided design (CAD), SolidWorks 2021 to a 3D model and fabricated into a full-scale prototype.
The design was then proceeded to concept evaluation through a decision matrix to select the best option. The design process commenced with the initial sketches to collect related ideas and design concepts. The dehydrator is designed to suit the needs of household users and small industries and works using a hot air mechanism.
This paper reported on the design and performance evaluation of a hybrid photovoltaic thermal solar dehydrator.
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