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ارزیابی بازده انرژی و اکسرژی جمعکننده خورشیدی مجهز به صفحه متخلخل، جریان بازگشتی و منعکسکنندهها | ||
| مهندسی بیوسیستم ایران | ||
| مقاله 12، دوره 51، شماره 2، تیر 1399، صفحه 371-384 اصل مقاله (851.89 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijbse.2020.279686.665183 | ||
| نویسندگان | ||
| میلاد رشیدی1؛ اکبر عرب حسینی2؛ هادی صمیمی اخیجهانی* 3 | ||
| 1دانشجوی کارشناسی ارشد مهندسی بیوسیستم، گروه فنی کشاورزی، پردیس ابوریحان دانشگاه تهران، پاکدشت، ایران | ||
| 2دانشیار گروه فنی کشاورزی، پردیس ابوریحان دانشگاه تهران، پاکدشت، ایران | ||
| 3استادیار گروه مهندسی بیوسیستم دانشگاه کردستان، دانشکده کشاورزی، سنندج، ایران | ||
| چکیده | ||
| در این تحقیق میزان انرژی حرارتی تولید شده، بازده انرژی و اکسرژی توسط جمعکننده در سه حالت با صفحه متخلخل (PS)، با جریان بازگشتی (PRS) و با منعکسکنندهها (PRE) در یک خشککن خورشیدی مورد مطالعه قرار گرفت. دبی جریان سیال در تمام حالتها 018/0 کیلوگرم بر ثانیه در نظر گرفته شد. برای مطالعه روند خشک شدن از ورقههای گوجهفرنگی به ضخامت هفت میلیمتر استفاده شد. دادهبرداریها در سه روز متوالی از ساعت 8:00 تا 18:00 در خرداد ماه سال 97 انجام گرفت. مقدار انرژی کل وارد شده به خشککن برای PS، PRS و PRE به ترتیب به اندازه 94/21، 93/24 و 77/28 مگاژول تغییر نمود. علاوه بر آن مقدار بازده انرژی از 03/21 تا 30/52 درصد برای PS، از 12/23 تا 23/58 درصد برای PRS و از 01/30 تا 75/69 درصد برای PRE به دست آمد. حداکثر میزان بازده اکسرژی برای سه حالت اشاره شده 40/19 درصد، 2/21 درصد و 12/23 درصد محاسبه شد. انرژی ویژه مصرفی برای خشک نمودن ورقهها برای PS، PRS و PRE به ترتیب 68/9، 28/9 و 82/8 مگاژول بر کیلوگرم به دست آمد و این نشان میدهد که استفاده از منعکسکنندهها گزینه مناسبی برای افزایش بازده حرارتی جمعکنندههای خورشیدی صفحه تخت میباشد. | ||
| کلیدواژه‌ها | ||
| انرژی حرارتی؛ انرژی مصرفی ویژه؛ تشعشع خورشیدی؛ کیفیت؛ ورقههای گوجه فرنگی | ||
| عنوان مقاله [English] | ||
| Evaluation of Energetic and Exergetic Efficiency of a Solar Collector Equipped with Porous Plate, with Recycling System and with Reflectors | ||
| نویسندگان [English] | ||
| Milad Rashidi1؛ Akbar Arabhosseini2؛ Hadi Samimi-Akhijahani3 | ||
| 1M.Sc. student of Biosystem Engineering, Department of Agro-technology, University of Tehran, Aboreyhan Campus, Pakdasht, Iran | ||
| 2Associate Professor of Biosystem Engineering, Department Agro-technology, University of Tehran, Aboreyhan Campus, Pakdasht, Iran | ||
| 3Assistance Professor of department of Biosystem Engineering, University of Kurdistan. Sanandj, Iran | ||
| چکیده [English] | ||
| 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. | ||
| کلیدواژه‌ها [English] | ||
| Thermal Energy, Specific energy consumption, Solar radiation, Quality, Tomato slices | ||
| مراجع | ||
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