ارزیابی عملکرد خشک‌کن خورشیدی کابینتی مجهز به سامانه مبدل حرارتی و صفحه متخلخل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد مهندسی بیوسیستم، گروه فنی کشاورزی پردیس ابوریحان دانشگاه تهران، تهران، ایران

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

3 استادیار گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه کردستان، سنندج، ایران

چکیده

در این تحقیق تاثیر استفاده از سامانه مبدل حرارتی بر افزایش میزان کارایی جمع کننده و خشک­کن خورشیدی مورد مطالعه قرار گرفت. همچنین از روش دینامیک سیالات محاسباتی برای شبیه­سازی انتقال گرما و چگونگی توزیع حرارت در خشک­کن خورشیدی مجهز به سامانه مبدل حرارتی با دو خروجی و صفحه متخلخل استفاده شد. نتایج نشان داد استفاده از مبدل حرارتی با حالت نیم دبی جرمی برای هر دو خروجی اول و دوم (kg/s 009/0) باعث افزایش میزان بازده سامانه تا 2/10 درصد نسبت به حالتی که از مبدل استفاده نشده است، می­گردد. افزایش بیش از حد دبی جریان سیال در مبدل باعث کاهش کارایی خشک­کن می­شود. نتایج حاصل از مقایسه داده­های CFD با داده­های آزمایشگاهی نشان داد که روش CFD با درصد خطای 9/6 درصد همبستگی خوبی با داده­های آزمایشگاهی دارند. استفاده از مبدل حرارتی در سامانه خشک­کن خورشیدی هیچ اثر منفی بر کیفیت رنگ نمونه گوجه­فرنگی خشک شده نداشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Solar Cabinet Dryer Equipped with Heat Exchanger and Porous Plate

نویسندگان [English]

  • Mernush Motahayyer Razdari 1
  • Akbar Arabhosseini 2
  • Hadi Samimi-Akhijahani 3
1 M.Sc. Graduated Student of Department of Biosystem Engineering, University of Tehran, Aboreyhan Campus, Iran
2 Associate Professor of Department of Biosystem Engineering, University of Tehran, Aboreyhan Campus, Iran
3 Assistant Professor of Biosystem Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran.
چکیده [English]

In this study, the effect of using heat exchanger on increasing the performance of the collector and solar dryer was investigated. Moreover, computational fluid dynamics (CFD) method was used to simulate the heat transfer and distribution of thermal counters in the cabinet solar dryer equipped with heat exchanger with two outlets and porous plate. The results showed that using heat exchanger with half air mass flow rate for the first and second outlets (0.009 kg/s) increases the efficiency of the dryer up to 10.2% related to the dryer without heat exchanger. Excessive air flow rate inside the heat exchanger decreases the performance of the solar cabinet dryer. The results of the comparison between the CFD and experimental data shows that CFD method with 6.9% of relative error has a good correlation with the experimental data. Using heat exchanger has no adverse effect on the color quality of dried tomato samples.

کلیدواژه‌ها [English]

  • CFD Method
  • Drying efficiency
  • Heat flux
  • Heat exchanger
  • Solar collector
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