Indirect and Mixed Mode Solar Drying Mathematical Models for Sultana Grape
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 11، شماره: 4
سال انتشار: 1388
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 98
فایل این مقاله در 10 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_JASTMO-11-4_001
تاریخ نمایه سازی: 1 آذر 1402
چکیده مقاله:
Many research studies have been performed on forced convection (active) solar dryers for fruit and vegetables. A short survey of these showed that applying the forced convection solar dryer not only significantly reduced the drying time but also resulted in many improvements in the quality of the dried products. Active indirect and mixed-mode thin layer solar drying experiments were conducted on Sultana grapes. A combination of a solar air heater and a cabinet dryer was designed, constructed and tested for this product in the Agricultural Engineering Department at Shiraz University, Iran. Three air flow rates (۰.۰۸۵, ۰.۱۲۶ and ۰.۱۷۱ m۳ s-۱) and two types of drying systems (indirect and mixed-mode) were adopted. The south wall of the drying chamber was covered by a sheet of glass for mixed-mode and the glass sheet was covered with a thick sheet of cloth for an indirect solar drying system. Seven well-known thin layer drying models were used separately to fit the mixed-mode and indirect type experimental data for Sultana grapes. For experimental indirect data, the Modified Page model (r= ۰.۹۹۸, χ۲= ۰.۰۰۰۲۴۱) and for experimental mixed-mode data, the Page model (r= ۰.۹۹۹, χ۲= ۰.۰۰۰۱۶۹) showed the best curve fitting results with highest r (correlation coefficient) and lowest χ۲ (reduced chi-square) values. The constants in these models explain the effects of drying parameters, air velocity and temperature. To take account of these effects, the best correlation equations between the constants and drying parameters were also introduced using multiple regression analysis.
کلیدواژه ها:
Cabinet solar dryer ، Thin layer mathematical model
نویسندگان
A. Zomorodian
Department of Agricultural Engineering, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
M. Dadashzadeh
Department of Agricultural Engineering, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.