The purpose of this paper is to compare several fins, duct height, and velocity magnitudes to acquire a PhotoVoltaic/Thermal system designed through Computational Fluid Dynamics. Simulation of different fins (rectangular, trapezoidal, curved, and pin) with different distances among fins is performed in Fluent software. The parameters such as duct height (4, 6, 8, and 10 centimeters) and velocity magnitudes (0.5, 1, 2, and 3 m/s) are also simulated. According to the results the highest cell temperature was 51°C at 0.5 m/s, while the best result was 33°C achieved with 4 cm duct height, rectangular fin and 3 m/s velocity magnitude. The findings suggest that the maximum cell temperature at the rate of 0.5 m/s is 51 °C, whereas temperature conducive to the best outputs is 33 °C. Differences among the cell temperatures through the various duct and the different fin types were significant at 1% level, also velocity magnitude would be cardinal at 1% level. A logarithmic regression model has been proposed to getting the cell temperature estimated by velocity magnitude.
Quality is an important factor in food products marketing, in the agricultural products, which the lack of agricultural equipment effects on it. Nowadays, separator devices play an important role in the quality of agricultural products. In this study, the separation of stigma from other components is analysed in oscillating separator, wind tunnel and combination of two states for determining their transposition. Oscillating separator experiments were performed based on completely randomized factorial design with 3 treatment of slope, amplitude, frequency and 3 replicates that each treatment is carried out at two levels. Considering that saffron components terminal velocities were different therefore wind tunnel experiments were done at different speeds within the range of saffron components terminal velocities. The results show that the combination of "wind tunnel-oscillating seperator" had the best seperation. In the oscillating seperator, the frequency of 35 Hz, amplitude of 7 μ and slope of 10˚ in comparison with other states had the optimum seperation. This combination was followed the average stigma separation of 86.29% and percent of impurities of 14.14%.
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