Studies on Sun Drying of Raw Rough Rice. (Part 4). Drying Characteristics and Solar Radiation on a Wavy Surface Layer.

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  • 生籾の太陽熱直射乾燥に関する研究　（第４報）　波面層の日射量と乾燥特性
  • ナマモミ ノ タイヨウ ネツ チョクシャ カンソウ ニカンスルケンキュウ ダイ
  • Drying Characteristics and Solar Radiation on a Wavy Surface Layer
  • 波面層の日射量と乾燥特性

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Solar drying characteristics of a rice grain layer with wavy surface was studied. The wavy surface layers were either fixed with slanting surfaces facing East-West direction or rotated every hour to follow the path of the sun. For the fixed case, the maximum solar radiation received on the surface facing East was 760W/m2 before noon and the surface facing West was 800W/m2 in the afternoon. These values are approximately 1.3 times the maximum of 600W/m2 on the plane surface. One day's change of solar radiation on the rotated wavy surface was nearly the same as plane surface layer, but the maximum was limited to 540W/m2. The plane surface had the highest integrated solar radiation, followed by the fixed wavy surface and the rotated wavy surface. The drying rates in the three cases were 0.28, 0.30 and 0.29%/h, respectively. The relationship of solar radiation and drying was also investigated when the drying constant, k, was substituted for drying rate.

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