مهندسی بیوسیستم ایران

مهندسی بیوسیستم ایران

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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دوره 51، شماره 2
تابستان 1399
صفحه 371-384

  • تاریخ دریافت 08 اردیبهشت 1398
  • تاریخ بازنگری 19 دی 1398
  • تاریخ پذیرش 25 دی 1398