مقایسه سینتیک خشک کردن برگ نعناع با خشک کن خورشیدی فتوولتائیک / گرمایی با خشک کردن طبیعی

نویسندگان
محمدرضا روزگار 1
محمد حسین عباسپور فرد 2
مهدی هدایتی زاده 3
حمید محمدی نژاد 1
1 دانشجوی دکتری گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه فردوسی مشهد
2 استاد گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه فردوسی مشهد
3 استادیار دانشکده کشاورزی، دانشگاه بیرجند، بیرجند
10.52547/fsct.18.119.193
چکیده
در این تحقیق یک خشک کن خورشیدی ترکیبی فتوولتائیک /گرمایی حاوی مواد تغییر فاز به منظور خشک کردن برگ های نعناع طراحی و ساخته شد. عملکرد این خشک کن تحت شرایط آب و هوایی مشهد با طول جغرافیایی 62/59 درجه و عرض جغرافیایی 26/36 درجه مورد بررسی قرار گرفت. اجزای اصلی این خشک کن عبارتند از : پنل فتوولتائیک، کلکتور خورشیدی، فن های دمنده، محفظه حاوی مواد تغییر فاز پارافین آلی و محفظه محصول. آزمایشات خشک کردن بر روی برگ های نعناع به دو روش خشک کردن با خشک کن خورشیدی ترکیبی و خشک کردن طبیعی در سایه با رطوبت اولیه 80 درصد بر پایه تر انجام گرفت و تا رسیدن به رطوبت 12 درصد ادامه یافت. مدت زمان خشک کردن با خشک کن خورشیدی 290 دقیقه و به روش طبیعی 1560 دقیقه طول کشید. داده های آزمایشگاهی با هشت مدل خشک کردن لایه نازک در پیشینه پژوهش برازش گردید که مدل دوجمله ای و مدل وانگ و سینق به ترتیب بهترین مدل ها برای خشک کردن طبیعی و با خشک کن خورشیدی ترکیبی بودند. این مدل ها نسبت به مدل های دیگر بیشترین تطبیق را با نسبت رطوبت آزمایشی ( بالاترین ضریب همبستگی و حداقل ریشه میانگین مربعات خطا و مربع کای ) دارند.
کلیدواژه‌ها
خشک کن خورشیدی
سینتیک خشک کردن
فتوولتائیک گرمایی
مواد تغییر فاز
نعناع

موضوعات

عنوان مقاله English

Comparison of drying kinetics of mint leaves by photovoltaic / thermal solar dryer and natural drying

نویسندگان English

Mohammad Reza Rouzegar 1
Mohammad Hossein Abbaspour-Fard 2
Mahdi Hedayatizadeh 3
Hamid Mohamadinezhad 1
1 PhD Student of Department of Biosystems Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad
2 Professor of Department of Biosystems Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad
3 Assistant Professor oF Faculty of Agriculture, University of Birjand, Birjand
چکیده English

In this research, a combined photovoltaic / thermal solar dryer containing phase change materials (PCM) was designed and fabricated for drying mint leaves. The performance of this dryer was evaluated under the climatic conditions of Mashhad city with a longitude of 59.62 and a latitude of 36.26. The components of this dryer mainly include: photovoltaic panel, solar collector, blowers, phase change material chamber containing paraffin wax and drying chamber. Solar dryer and natural drying in shade as two different drying types were used to perform experiments on mint leaves. The initial moisture content of the mint leaves was 80% which reduced to 12%. The required drying time for the combined solar drying and natural drying was 290 minutes and 1560 minutes, respectively. Eight thin layer drying models available in the literature were fitted to the experimental data in which the Two-term model and the Wang and Singh model were the best fit models for natural and combined solar drying respectively. These models have the highest correlation (highest coefficient of determination and least root mean square error and Chi-square) with the experimental moisture ratio among the other models.

کلیدواژه‌ها English

Solar dryer
Drying kinetics
Photovoltaic / Thermal
Phase Change Materials
Mint
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