بررسی ترمواکونومیک خشک‌کن خورشیدی کابینتی با کلکتور لوله خلأ وذخیره کننده انرژی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه پژوهشی انرژی‌های تجدیدپذیر و تبدیل انرژی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان.

2 استادیار، گروه مهندسی بیوسیستم دانشکدۀ کشاورزی، دانشگاه کردستان، کردستان.

چکیده

در این تحقیق تاثیر استفاده از مواد تغییر فاز دهنده (PCM) در مخرن ذخیره کننده حرارت بر عملکرد یک خشک‌کن خورشیدی، مورد بررسی قرار گرفت. آزمایش‌ها برای PCM در سه سطح 54/1، 45/2، 6/3 کیلوگرم و برای دبی سیال در دو سطح 2/0 و 4/0 لیتر بر دقیقه انجام شد. با افزایش دبی سیال بازده حرارتی جمع‌کننده از 2/20 تا 4/62 درصد تغییر می‌کند. نتایج نشان داد تغییرات انرژی حرارتی برای دبی سیال 2/0 و 4/0 لیتر بر دقیقه به ترتیب بین 31/13 تا 63/13 و 45/14 تا 92/14 مگاژول به‌دست آمد. همچنین نتایج نشان داد بازده کلی خشک‌کن با افزایش PCM افزایش یافته و تغییرات آن برای دبی 2/0 لیتر بر دقیقه از 92/32 تا 55/35 درصد و برای دبی 4/0 لیتر بر دقیقه 19/32 تا 02/36 درصد است. با توجه به مقادیر انرژی ویژه و بازده کلی خشک‌کن، دبی 2/0 لیتر بر دقیقه با مقدار PCM به میزان 6/3 کیلوگرم گزینه مناسبی برای خشک‌کردن می‌باشد. دوره بازگشت سرمایه برای سامانه حدود 20 ماه به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Thermo-Economic evaluation of a solar dryer with evacuated heat pipe collector and energy storage

نویسندگان [English]

  • Mohammad Saleh Barghi Jahromi 1
  • Masoud Iranmanesh 1
  • Hadi Samimi akhijahani 2
1 Renewable Energy and Energy Conversion Research Department, Graduate University of Industrial and Advanced Technology, Kerman.
2 Department of Biosystems Engineering, Faculty of Agriculture, University of Kurdistan, Kurdistan.
چکیده [English]

In this experimental study the effect of using phase change materials (PCM) in the thermal storage tank on the performance of a solar dryer was investigated. The experiments were carried out for three levels of PCM 1.54, 2.45 and 3.6 kg and two levels of fluid flow rate of 0.2 and 0.4 l/min. The results showed that with increasing the fluid flow, the thermal efficiency of the collector from 62.4% to 20.2% for 0.4 l/min. The thermal energy for fluid flow of 0.2 and 0.4 lit/min obtained about 13.31 to 13.63 MJ and 14.45 to 14.92 MJ, respectively. The results also showed that the overall efficiency of the dryer increased with increasing PCM and it changes from 32.92% to 35.55% for the fluid flow rate of 0.2 l/min and 32.19% to 36.02% for 0.4 l/min. Considering the specific energy used for drying of the samples and drying efficiency the fluid flow with 0.2 l/min and PCM with 3.6 kg is a proper choice for drying of apple slices. The payback period was obtained about 20 months.

کلیدواژه‌ها [English]

  • Solar Energy
  • Collector thermal efficiency
  • Fluid flow rate
  • Phase change materials
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