Development of Indirect Solar Dryer for Drying Onions Under Egyptian Conditions | ||||
| Damietta Journal of Agricultural Sciences | ||||
| Volume 3, Issue 1, January 2024, Page 11-24 PDF (1.31 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/djas.2024.406056 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Samar Khafagy  1; Moheb El Sharabasy1; M. Darwesh2
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| 1Agric. and Bio-Systems. Eng., Dept., Fac. of Agric., Damietta Univ., Egypt | ||||
| 2Agric. Structures and Environmental Control, Tanta Univ., Egypt | ||||
| Abstract | ||||
| Applications of solar energy in dehydration process due to higher prices and shortages of fossil fuels, and to reduce the fuel consumption used in the dehydration processes. In addition, solar energy sources as they are freely available. So, the aim of this study was to develop and evaluate an indirect solar dryer to optimize the efficiency of solar air dryers. A solar dryer consists of a solar flat plate air collector with V corrugated-absorption plates, an insulated drying chamber, and a chimney for exhaust air. The total area of the collector’s is 1.5 m2. The size of the drying cabinet is (80 cm length, 80 cm width, and 80 cm height). The qualitative analysis for drying onions showed that the moisture content of onions was reduced from an initial value of 85% (w.b.) to the final moisture content 5.66% to 6.54% (w.b). The dryer’s efficiency per day was 39.3% and 42.3% at dryer (A) and dryer (B), respectively. Therefore, the use of the developed dryer led to an increase in the dryer’s efficiency by 7.63% for the air flow rate of 2.8 m3/min. While it was 34.1% and 38.82% at dryer (A) and dryer (B), respectively, the use of the developed dryer led to an increase in the dryer’s efficiency by 13.84% for the air flow rate of 1.8 m3/min. | ||||
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