دراسة اداء مجفف شمسى لبعض المحاصیل ( النعناع والعنب والبامیة) II - توافق سلوک التجفیف الشمسى مع النماذج الریــاضیـــة للتجـفیـف فـــی طبقـــات رقیقـــة

نوع المستند : Original Article

المؤلف

أستاذ مساعد – قسم الهندسة الزراعیة – کلیة الزراعة – جامغة الزقازیق، مصر.

المستخلص

تهدف الدراسة إلى مقارنة سلوک التجفیف لشرائح  بعض المحاصیل مثل النعناع و البامیة و العنب فى طبقات رقیقة تحت ظروف التجفیف فى مجفف شمسى مباشر بالحمل الطبیعى مع ستة نماذج ریاضیة.
وکانت النتائج کالتالى:
1-     کانت اعلى درجة حرارة داخل غرفة المجفف 66 درجة مئویة عندما کانت درجة الحرارة البیئیة والرطوبة النسبیة المقابلة 36 الى 39 درجة مئویة و23 الى 29 % على التوالی وکانت سرعة الهواء 5 الى 12 م/ث.
 2- بعض المعادلات أمکنها وصف سلوک التجفیف الشرائح بشکل مرضی تحت ظروف التجفیف المباشر بالحمل الطبیعى مع المجفف المستخدم فى الدراسة وکان ذلک مصحوبا بقیم عالیه لمعامل الارتباط (R2) .
حیث تنبأت معادلة بیج المعدلة بالتغیر فی المحتوی الرطوبی بشکل أکثر ملائمة بالمقارنة بالمعادلات الأخرى بالنسبة للنعناع حیث کان
X2= 2.52x10-3, MBE=0.0188 and RMSE = 0.77611))
وتنبأت معادلة نیوتن المعدلة بالتغیر فی المحتوی الرطوبی بشکل أکثر ملائمة بالمقارنة بالمعادلات الأخرى بالنسبة للبامیة حیث کان
(X2= 3.47x10-3, MBE=-0.012 and RMSE = 0.051)
وتنبأت معادلة وینج و سنج المعدلة بالتغیر فی المحتوی الرطوبی بشکل أکثر ملائمة بالمقارنة    بالمعادلات الأخرى بالنسبة للعنب حیث کان
(X2= 1.1x10-3, MBE=-0.02823 and RMSE = 0.116417)

Agrawal, Y. C., & Singh, R. P. (1977). Thin layer drying studies on short grain rough rice. ASAE, Paper No: 3531.
Ait Mohamed, L., Kouhila, M., Jamali, A., Lahsasni, S., Kechaou, N., &
Mahrouz, M. (2005). Single layer solar drying behavior of Citrus aurantium leaves under forced convection. Energy Conversion and Management, 46, 1473–1483.
Akpinar, E. K., Bicer, Y., & Midilli, A. (2003). Modeling and experimental study on drying of apple slices in a convective cyclone dryer. Journal of Food Process Engineering, 26(6), 515–541.
Akpinar, E. K., Bicer, Y., & Yildiz, C. (2003). Thin layer drying of red pepper. Journal of Food Engineering, 59, 99–104.
Akpinar, E. K., Midilli, A., & Bicer, Y. (2003a). Single layer drying behavior of potato slices in a convective cyclone dryer and mathematical modeling. Energy Conversion and Management, 44, 1689–1705.
Akpinar, E. K., Midilli, A., & Bicer, Y. (2003b). Experimental investigation of drying behavior and conditions of pumpkin slices via a cyclone-type dryer. Journal of the Science of Food and Agriculture, 83,1480–1489.
Azzouz, S.; A. Guizani; W. Jomaa and A. Belghith (2002). Moisture diffusivity and drying kinetic equation of convective drying of grapes. Journal of food engineering 55: 323-330.
Basunia, M. A., & Abe, T. (2001). Thin-layer solar drying characteristics of rough rice under natural convection. Journal of Food Engineering,47, 295–301.
Chhninman, M. S. (1984). Evaluation of selected mathematical models for describing thin layer drying of in-shell pecans. Transactions of the ASAE, 27, 610–615.
Diamante, L. M., & Munro, P. A. (1991). Mathematical modeling of hot air drying of sweet potato slices. International Journal of Food Science and Technology, 26, 99.
Doymaz, I. and M. Pala (2002). The effect of dipping pre-treatment on air drying rates of the seedless grapes. Journal of food engineering, 52: 413-417.
Doymaz, I. (2004). Convective air drying characteristics of thin layer carrots. Journal of Food Engineering, 61, 359–364.
Doymaz, I. (2005). Sun drying of figs: an experimental study. Journal of Food Engineering, 71, 403–407.
Erenturk, S., Gulaboglu, M. S., & Gultekin, S. (2004). The thin-layer drying characteristics of rosehip. Biosystems Engineering, 89(2),159–166.
Ertekin, C., & Yaldiz, O. (2004). Drying of eggplant and selection of a suitable thin layer drying model. Journal of Food Engineering, 63,349–359.
Gu¨nhan, T., Demir, V., Hancioglu, E., & Hepbasli, A. (2005). Mathematical modeling of drying of bay leaves. Energy Conversion and Management, 46(11–12), 1667–1679.
Hossain, M. A., & Bala, B. K. (2002). Thin-layer drying characteristics for green chilli. Drying Technology, 20(2), 489–505.
Kassem, A. S. (1998). Comparative studies on thin layer drying models for wheat. 13th International Congress on Agricultural Engineering (Vol. 6). 2–6 February, Morocco.
Liu, Q., & Bakker-Arkema, F. W. (1997). Stochastic modeling of grain drying, Part 2: Model development. Journal of Agricultural Engineering Research, 66, 275–280.
Midilli, A., Kucuk, H., & Yapar, Z. (2002). A new model for single layer drying. Drying Technology, 20(7), 1503–1513.
Midilli, A., & Kucuk, H. (2003). Mathematical modeling of thin layer drying of pistachio by using solar energy. Energy Conversion and Management, 44, 1111–1122.
O’Callaghan, J. R., Menzies, D. J., & Bailey, P. H. (1971). Digital simulation of agricultural dryer performance. Journal of Agricultural Engineering Research, 16, 223–244.
O¨zdemir, M., & Devres, Y. O. (1999). The thin layer drying characteristics of hazelnuts during roasting. Journal of Food Engineering, 42, 225–233.
Pangavhane,  D.R.;  R.L.   Sawhney  and P.N.   Sarsavadia   (2000). Drying Kinetic studies on single layer Thompson seedless grapes controlled heated air conditions. Journal of Food processing and Preservation, 24, 335- 352.
Sarsilmaz, C., Yildiz, C., & Pehlivan, D. (2000). Drying of apricots in a rotary column cylindrical dryer (RCCD) supported with solar energy. Renewable Energy, 21, 117–127.
Simal, S., Femenia, A., Garau, M. C., & Rosella, C. (2005). Use of exponential, Page and diffusional models to simulate the drying kinetics of kiwi fruit. Journal of Food Engineering, 66(3), 323–328.
Togrul, I. T., & Pehlivan, D. (2003). Modeling of drying kinetics of single apricot. Journal of Food Engineering, 58(1), 23–32.
Togrul, I. T., & Pehlivan, D. (2004). Modeling of thin layer drying kinetics of some fruits under open-air sun drying process. Journal of Food Engineering, 65, 413–425.
Wang, C. Y., & Singh, R. P. (1978). A single layer drying equation for rough rice. ASAE Paper No: 3001.
Werma, L. R., Bucklin, R. A., Endan, J. B., & Wratten, F. T. (1985). Effects of drying air parameters on rice drying models. Transactions of the ASAE, 28, 296–301.
Westerman, P. W., White, G. M., & Ross, I. J. (1973). Relative humidity effect on the high temperature drying of shelled corn. Transactions of the ASAE, 16, 1136–1139.
Yaldiz, O., & Ertekin, C. (2001). Thin layer solar drying of some vegetables. Drying Technology, 19, 583–596.
Zhang, Q., & Litchfield, J. B. (1991). An optimization of intermittent corn drying in a laboratory scale thin layer dryer. Drying Technology, 9, 383–395.
Zomorodian,A. A. and M. Dadashzadeh(2009). Indirect and Mixed Mode Solar Drying Mathematical Models for Sultana Grape.