آنالیز انرژی و اکسرژی خشک‌کن پیوسته مادون قرمز- هوای گرم جریان همسو با چرخه هوای بازگشتی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش اموخته کارشناسی ارشد گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه کردستان

2 استادیار، گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه کردستان، سنندج، کردستان

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

چکیده

آنالیز اکسرژی و انرژی خشک­کن پیوسته ترکیبی مادون‌قرمز-هوای گرم با ساختار بستر همسو مورد بررسی قرار گرفت. آزمایش‌ها برای سه سطح دمایی 40، 50 و ºC 60، سرعت هوای  5/0، 1 و m/s 5/1 و توان مادون‌قرمز 500، 600 و W 700 برای دو حالت فاقد چرخه و 100% چرخه هوای بازگشتی برای گیاه مرزه انجام گرفت. به­کارگیری 100% چرخه هوای بازگشتی در مقایسه با حالت بدون هوای بازگشتی موجب صرفه‌جویی 10/29 الی 30/50% در انرژی مصرفی ویژه شد. استفاده از سطوح بالای توان مادون‌قرمز و دمای هوا و سطوح پایین سرعت هوا همراه با چرخه هوای بازگشتی سبب افزایش راندمان انرژی شده است (p<0.05). حداکثر مقدار بازده انرژی برای حالت بدون چرخه و با 100% چرخه هوای بازگشتی به‌ترتیب 90/20 و 21/30% به‌دست آمد. انرژی اتلافی ویژه به‌شدت تحت تأثیر سرعت هوا و چرخه هوای بازگشتی می­باشد (p<0.05). انرژی اتلافی برای حالت فاقد چرخه و 100% هوای بازگشتی به‌ترتیب از 54/8 الی MJ/kg water 24/37 و 21/5 الی MJ/kg water 04/20 متغیر بوده است. دما و سرعت هوا بیش‌ترین تأثیر را بر راندمان اکسرژی داشته، به‌طوری‌که حداکثر مقدار آن برابر با 21/10% برای شرایط ºC 60، m/s 5/0 و W 700 با 100% چرخه هوای بازگشتی محاسبه شد. پتانسیل بهبود اکسرژی برای حالت فاقد چرخه هوای بازگشتی و 100% چرخه هوای بازگشتی به‌ترتیب در محدوده 73/2 الی MJ/kg water 12/5 و 35/2 الی MJ/kg water 02/4 به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Energy and exergy analyses of continues infrared-hot air current dryer with air recycling

نویسندگان [English]

  • Zanyar Farhudi 1
  • Hosain Darvishi 2
  • Nasser Behroozi 3
1 BA Department of Biosystems Engineering; of Agriculture; University of Kurdistan, Sanandaj, Kurdistan, Iran
2 Department of Biosystems Engineering; Faculty of Agriculture; University of Kurdistan, Sanandaj, Kurdistan, Iran
3 Department of Biosystems Engineering; Faculty of Agriculture; University of Kurdistan, Sanandaj, Kurdistan, Iran
چکیده [English]

Energy and exergy analyses were conducted of the continuous combined infrared-hot dryer with current bed structure. The experiments were carried out at three levels of air temperature (40, 50 and 60 °C), three levels of air velocity (0.5, 1.0, and 1.5 m/s) and three levels of infrared power (500, 600 and 700 W) under without and 100% air recirculation for savory. Using 100% air recirculation indicated that specific energy consumption could be saved from 29.10 to 50.34% as compared without air recirculation. The use of high levels of infrared power and air temperature and low levels of air velocity with air recirculation led to increase energy efficiency (p<0.05). Maximum energy efficiency for without and 100% air recirculation modes was obtained 20.90% and 30.21%, respectively. Specific energy loss is strongly influenced by air velocity and air recirculation mode (p<0.05). Energy loss varied between 8.54 and 37.24 MJ/kg-water, and 5.21 and 20.04 MJ/kg -water for without and 100% air recirculation modes, respectively. The air temperature and velocity had the greatest effect on exergy efficiency, maximum value of it was obtained 10.21% for conditions of 60ºC, 0.5 m/s and 700 W with 100% air recirculation. The exergetic improvement potential vaired between 2.73 – 5.12 Mj/kg water and 2.35 – 4.02 MJ/kg water for whitout and 100% recirculation modes, respectively.

کلیدواژه‌ها [English]

  • Hot air – infrared dryer
  • energy
  • exergy loss
  • improvement potential
  • air recirculation
  • savory
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