Tikrit Journal of Engineering Sciences (2011) 18(1) 1- 14
The Application of Solar Energy in the Crops Drying Process
Abbass Z. Salman & Mohammed A. Fayad, Energy and Fuel Research Center, University of Technology, Baghdad, Iraq
Abstract
In the present study two convective types of solar dryers were investigated and tested under the Iraqi climate conditions. The first is called indirect type which consists of solar collector and drying chamber and the second type is a direct solar dryers. A drying equation based on a thin layer-drying function has been introduced to simulate the change of moisture content of crops with time taking into account the effect of flow rate of air, drying temperature, humidity ratio, initial and final moisture contents, and crops distribution on the drying rate and can be used for different crops. The dryers were tested using potato, fruit, any vegetables and other kinds of green leaves under typical condition of Iraqi weather. Good agreement has been obtained between the present results and the available published measurements. The study indicates that the indirect solar dryer gives definite performance advantage compared with the direct solar dryer.
Keywords: Solar energy, preserved foods.
References
- Walker, J. N., “Predicting Temperatures in Ventilated Greenhouse, Transactions of the ASAE Vol. 8(3), pp. 445-448, 1965.
- Misra, R. N., Keener, H. M., and Roller, W. L., “Solar Heat for Corn Drying Under Ohio Conditions, Part H: Summer Storage of Solar Heat”, Transactions of the ASAE Vol. 25 (2), pp. 459464, 1982.
- Radajewsld, W., Gaydon, D., and McGahan, E. I., “Optimization Of Solar Bay Drying In A Step-Flow Dryer”, Trans. of the ASAE vol. 33(5), pp. 1423-143 t, 1990.
- Sharma, V. K-, Sharma, S., and Garg, H. P., “Mathematical Modeling and Experimental Evaluation of a Natural Convection Type Solar Cabinet Dryer”, Energy Conversion and Management, Vol. 31 (1), pp. 65-73, 1991.
- Tiris, C., Tiris, M., and Dincer, L, “Investigation of the Thermal Efficiencies of a Solar Dryer, Energy Conversion and Management Vol. 36(3), pp. 205-212, 1995.
- Module 2.2″Thermal Analysis Of The Collector To Estimate The Collector Efficiency And Heat Removal Factors”, Paper at Int. Thermal Analysis of Flat Plate Collectors. 2001.
- Witter, Volker, “Global Trends in Solar Thermal Technology, 2nd European Solar Thermal Energy Conference, Germany June, 2005.
- Nuh, D. N., and Brinkworth, B. J., “A Novel Thin-Layer Model For Crop Drying”, Transactions of the ASAE Vol. 40(3), pp. 659-669, 1997.
- ITASHRAE “Handbook, Fundamentals”, Chapter 5, 1981.
- Kazimierz Szymocha, “Advanced Thermal Solar System with Heat Storage for Residential House Space Heating”, Canada, August 2004.
- Syarief, A. M., Morey, R. J. and Gustafson. R. J., “Thin-Layer Drying Rates of Sunflower Seed”, Transactions of the ASAE Vol. 27 ;( 1), pp. 195-200, 1984.