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KMID : 0903519830260020075
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1983 Volume.26 No. 2 p.75 ~ p.81
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Drying of Agricultural Products by the Flat - plate Solar Collector with Rock - piled Heat Storage Medium
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Abstract
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The performance of the flat-plate solar collector with rock-pile thermal storage medium and the drying characteristics of rough rice and red pepper by use of natural air and of supplementary heated air by the solar drier were studied.
The Thermal efficiency of the flat-plate solar collector was average 25.4 percent and the overall heattransfer coefficient of the collector was approximately 38.13kJ/hr.㎡℃. The flat-plate collector was able to supply the supplementary heated air which w-as about 7℃ higher than the ambient air temperature during the daytime and about 3℃ higher thaw during the night.
For rough rice drying of grain moisture content from 24.5 to 14.5%, it took 18 days in the natural air system, 12 days in the tubular solar collector and 10 days in the flat-plate solar collector. For red pepper drying from it´s moisture from 81.0 to 15.0%, 68 hrs required under conventional sun drying system, but 38 hrs in tubular solar collector and 36 hrs in the flateplate solar collector.
The changes of capsanthin and capsaicine content were investigated at various drying system, and little difference was found among the drying system.
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