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Showing 3 results for Mosavi Seyedi


Volume 13, Issue 54 (8-2015)
Abstract

Present study were investigated to evaluation the quality parameters in drying of Aloe vera in three temperatures (40, 50, 60 °C), air velocity (0.5, 1, 1/5 m/s) and hot air recycling (0, 50 and 75%) in order to reduce waste. The results showed that with increasing temperature, the samples showed less resistance to color change. The highest difference dried gel was at 70 °C so that the increasing air velocity and temperature was increased this index. Also, the maximum change pH and shrink were obtained to be 0.58 and 86.2%, at 60 °C and 1.5m/s respectively in case without recycling hot air, while its minimum value 0.3 and 70.6% were at 40 °C and 0.5m/s in case with 75% recycling hot air, respectively. The maximum value of rehydration water was obtained to be 301%  at 40 °C and 0.5 m/s in case with 75% recycling hot air, while its minimum value 199%  were at 60 °C and 1.5m/s in case without recycling hot air.

Volume 13, Issue 54 (8-2015)
Abstract

The research aimed at mathematical modeling, kinetics and energy consumption of a hot air dryer with air recycle (0, 50%, and 75%). A hot-air dryer capable of recycling the exhaust air was used. The experimental data were fitted to standard thin-layer drying models in MATLAB 2007. The best model was selected according to the coefficient of correlation (R2), chi-square (c2) and root mean squares error (RMSE). These indices showed that the Midilli et al. model has the best fit for explaining the experimental data. The required energy was minimum at 0.5 m/s and 60˚C for 0%, 50% and 75% recycled air levels and was maximum at 1.5 m/s and 40˚C for all recycling levels. The hot-air recirculating system also reduced energy requirements and increased the drying time for aloe vera.

Volume 20, Issue 5 (May 2020)
Abstract

Now a day most countries are interested in renewable energy due to the many problems with fossil fuel use. One of the best types of renewable energies is solar energy and can be produced in electrical, thermal and hybrid forms by photovoltaic cells equipped with thermal collectors. In this research a systemLinear parabolic focusers equipped with photovoltaic cells were designed and simulated in Optic Ray Tracing and Solidworks software and compared with experimental results. The thermal collector was simulated in a photovoltaic-thermal hybrid system with two longitudinal and transverse arrangements with internal diameters of 8 to 14 mm at three discharge levels.Simulation results of two longitudinal and transverse arrangements showed that the thermal efficiency in the longitudinal arrangement was better than the transverse ones. and by increasing diameter from 8 to 12 mm the thermal efficiency increased and the thermal efficiency from 12 to 14 mm alignment of the pipes did not change much. Also by increasing the fluid discharge from 1 to 3 l/min the thermal efficiency due to the decrease in thermal losses and the electrical efficiency due to the decrease in temperature Photovoltaic cell surface increased. Comparison of the simulation results and the experimental evaluation showed that the maximum thermal and electrical efficiency for the data Simulations were 61.18% and 12.58%, respectively, and for field data is calculated 58.14% and 12.03%, respectively.

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