IJE TRANSACTIONS C: Aspects Vol. 28, No. 12 (December 2015) 1796-1801   

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A.B. Ubale, D. Pangavhane, A. Autic and Warke
( Received: September 25, 2015 – Accepted: December 24, 2015 )

Abstract    An evacuated tube solar collector drier is designed and developed to study analytically and experimentally drying kinetics of Thompson seedless grapes in Pune, India. Drying experiments are carried out in the month of April- June for continuous three years from 2013-2015. During the experimentation, temperatures of hot and cold air at various places, ambient relative humidity and humidity variation in drying chamber, wind velocity and mass of the grape are measured on hourly basis. 10 kg of Thompson seedless grapes are dried in forced convection heat transfer mode from initial moisture content of 76% (wb) to final moisture content 15%(wb) in 37 hours. The drying is carried out under the uncontrolled conditions. The average evacuated tube solar collector efficiency is found 24.5% where as the stacked type dryer which is insulated from outside has given drying efficiency up to 37.1%. To study drying behavior analytically nine different drying models have been tested. It is observed that, Page model describe the drying behavior accurately with highest coefficient of determination (R2 = 0.993), lowest reduced chi-square (χ2 = 5.19x10-5) and lowest root mean square error (RMSE = 0.02071).


Keywords    Evacuated tube solar dryer, Thompson grapes, drying kinetics, forced convection


چکیده    یک خشک کن کلکتور خورشیدی لوله توخالی طراحی و توسعه یافت و مطالعه تحلیلی و تجربی سینتیک خشک کردن انگور تامپسون بیدانه در پونا، هند، انجام گرفت. آزمایش های خشک کردن در ماه آوریل- ژوئن در سه سال متوالی از 2013 تا 2015 انجام شده است. در طول آزمایش، دمای هوای سرد و گرم در مکان های مختلف، رطوبت نسبی محیط و تنوع رطوبت در محفظه خشک کن، سرعت باد و وزن انگور به صورت ساعتی اندازه گیری شد. 10 کیلوگرم انگور تامپسون بیدانه در حالت انتقال حرارت همرفت اجباری از رطوبت اولیه 76٪ (وزنی) تا رطوبت نهایی 15٪ (وزنی) در 37 ساعت خشک شد. فرایند خشک کردن تحت شرایط کنترل نشده انجام شد. متوسط ​​راندمان کلکتور خورشیدی لوله توخالی 5/24درصد بود در حالی که خشک کن انباشته که از خارج عایق شده بود بهره وری خشک کردن تا 1/37 درصد داشت. برای مطالعه رفتار خشک کردن به صورت تحلیلی، نه مدل مختلف خشک کردن آزمایش شد. مشاهده شد که مدل پیج با بالاترین دقت ضریب تعیین (R2 = 0.993)، کمترین کاهش مجذور کای (χ2 = 5.19x10-5) و کمترین ریشه میانگین مربعات خطا (RMSE = 0.02071) رفتار خشک کردن را توصیف می کند.



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