University of Tehran Press Iranian Journal of Biosystem Engineering 2008-4803 51 2 2020 06 21 Evaluation of Energetic and Exergetic Efficiency of a Solar Collector Equipped with Porous Plate, with Recycling System and with Reflectors Evaluation of Energetic and Exergetic Efficiency of a Solar Collector Equipped with Porous Plate, with Recycling System and with Reflectors 371 384 77058 10.22059/ijbse.2020.279686.665183 FA Milad Rashidi M.Sc. student of Biosystem Engineering, Department of Agro-technology, University of Tehran, Aboreyhan Campus, Pakdasht, Iran Akbar Arabhosseini Associate Professor of Biosystem Engineering, Department Agro-technology, University of Tehran, Aboreyhan Campus, Pakdasht, Iran Hadi Samimi-Akhijahani Assistance Professor of department of Biosystem Engineering, University of Kurdistan. Sanandj, Iran Journal Article 2019 04 28 In this study, the amount of produced thermal energy, exergetic and energetic efficiency of a collector at three conditions with porous plate (PS), with recycling system (PRS) and with reflectors (PRE) in a solar dryer was investigated. For all the experiments the fluid flow rate was 0.018 kg/s. Tomato slices with 7 mm thickness were considered for drying process evaluation. All the experiments were carried out during three consecutive days of June of 2018 from 8:00 to 18:00. The value of total energy enters to the dryer for PS, PRS and PRE changed to 21.94, 24.93 and 28.77 MJ, respectively. Moreover, the energy efficiency obtained 21.03-52.30% for PS, 23.12-58.23% for PRS and 30.01-69.75% for PRE. The maximum exergy efficiency for mentioned conditions was calculated about 19.40%, 21.20% and 23.12%, respectively. The specific energy used for drying of the slices for PS, PRS and PRE was obtained 9.68, 9.28 and 8.82 MJ/kg, respectively and this shows that using the reflectors is proper method to increase thermal efficiency of the flat plate collectors. In this study, the amount of produced thermal energy, exergetic and energetic efficiency of a collector at three conditions with porous plate (PS), with recycling system (PRS) and with reflectors (PRE) in a solar dryer was investigated. For all the experiments the fluid flow rate was 0.018 kg/s. Tomato slices with 7 mm thickness were considered for drying process evaluation. All the experiments were carried out during three consecutive days of June of 2018 from 8:00 to 18:00. The value of total energy enters to the dryer for PS, PRS and PRE changed to 21.94, 24.93 and 28.77 MJ, respectively. Moreover, the energy efficiency obtained 21.03-52.30% for PS, 23.12-58.23% for PRS and 30.01-69.75% for PRE. The maximum exergy efficiency for mentioned conditions was calculated about 19.40%, 21.20% and 23.12%, respectively. The specific energy used for drying of the slices for PS, PRS and PRE was obtained 9.68, 9.28 and 8.82 MJ/kg, respectively and this shows that using the reflectors is proper method to increase thermal efficiency of the flat plate collectors. https://ijbse.ut.ac.ir/article_77058_61239a6367696bc6ab7b74b2dc639eb9.pdf