ارزیابی بازده انرژی و اکسرژی جمع‌کننده خورشیدی مجهز به صفحه متخلخل، جریان بازگشتی و منعکس‌کننده‌ها

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی بیوسیستم، گروه فنی کشاورزی، پردیس ابوریحان دانشگاه تهران، پاکدشت، ایران

2 دانشیار گروه فنی کشاورزی، پردیس ابوریحان دانشگاه تهران، پاکدشت، ایران

3 استادیار 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


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 Rashidi 1
  • Akbar Arabhosseini 2
  • Hadi Samimi-Akhijahani 3
1 M.Sc. student of Biosystem Engineering, Department of Agro-technology, University of Tehran, Aboreyhan Campus, Pakdasht, Iran
2 Associate Professor of Biosystem Engineering, Department Agro-technology, University of Tehran, Aboreyhan Campus, Pakdasht, Iran
3 Assistance 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
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