Drying characteristics of spinach (spinacia oleracea L.) in solar tunnel dryer

被引：0

作者：

Lokhande, Rupali S. ^{[1
]}

Kumbhar, B.K. ^{[1
]}

Shahi, N.C. ^{[1
]}

Chand, Khan ^{[1
]}

Singh, Anupama ^{[1
]}

机构：

[1] Department of Post Harvest Process and Food Engineering, College of Technology, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttrakhand,263145, India

来源：

International Agricultural Engineering Journal | 2014年 / 23卷 / 02期

关键词：

Moisture - Moisture determination - Solar dryers - Drying - Solar radiation - Efficiency;

D O I：

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摘要：

Spinach (Spincicia oleracea L.), is highly perishable and one of the most important leafy vegetables widely used for culinary purpose. Its preservation can prevent huge wastage as well as make it available in the lean season. The mechanical drying involves higher cost of drying and open sun drying, which deteriorates the quality. Thus, the need for an intermediate level technology was realized and an effort was made to dry the spinach in small scale solar tunnel dryer (STD). STD temperature was 15-17°C higher than ambient air temperature. In months of February and March the range of STD temperature and relative humidity was 30-47°C, 20%-52% and 40-55°C, 14%-50%, respectively. The spinach was dried from initial moisture content 88.21%-94.04% (w.b.) to final moisture content 3.50%-5.13 % (w.b.). Total drying time was in range of 6.3 to 10.0 h. The drying time was considerably reduced as compared to open sun drying of spinach as sun drying took 15 h for drying. The dehydration ratio of the spinach varied from 9.083 to 21.177. The collector efficiency, drying efficiency and overall efficiency were in the range of 28.73%-61.15%, 11.63%-22.13% and 7.61%-14.66%, respectively. The logarithmic model was found best to describe the drying behavior of spinach. © 2014 AAAR.

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