Study on the Optimum Paddy Storage by Silo Cooling

利用模型筒仓，对储藏稻谷的温度随时间变化进行了测量。结果表明，由于筒仓表面温度比周围温度高很多，大量的热量渗入筒仓内部。为此，对防止温升的方法进行了探讨。I)太阳辐射被筒仓表面的覆盖材料反射。2)用绝缘体隔热。表面温度往往比环境温度高20ﾟC.2。通过在表面覆盖铝膜，表面温度被限制在与环境温度相近的范围内。当储存的粮食温度较低时，即使使用保温层，即使有太阳辐射，表面温度也变得低于环境温度。然而，这比夜间的环境温度要高。筒仓内任意位置的粮温均可用热传导方程计算。采用铝膜处理后，筒仓周边区域大米的脂肪酸值比普通筒仓高9 mg-KOH/100g粒；其次，通过测量温度和理论分析了覆盖材料与表面温度的关系。当表面受到直接辐射时，表面温度受材料发射率的影响很大。在红外灯的照射下测量了平衡温度。表面温度根据材料的不同而不同，因此选择盖子的材料是正确的。地表温度受外界风的影响很大。

Using the model silo, temperature of stored paddy was measured with time elapsing. It was clarified that the silo surface temperature becomes much higher than ambient temperature, so lots of heat penetrates into inside of silo. Therfore, the methods of preventing the temperature rising was examined. i) The solar radiation is reflected by the covered material on the silo surface. ii) The heat is insulated by an insulation.1. The surface temperature often becomes higher than ambient temperature by 20 ﾟC.2. By covering the surface with aluminium film, the surface temperature is restricted just about ambient temperature.3. When the stored grain temperature is low, surface temperature becomes lower than ambient temperature even with solar radiation by using an insulation. However, that is higher than ambient temperature at night.4. The grain temperature at any position in the silo can be calculated the heat conduction equation.5. Using the aluminium film, the fat acidity value of rice in the peripheral zone in the silo is higher than that of ordinary silo by 9 mg-KOH/100g grain.Next, the relation between covered material and surface temperature was considered using measured temperatures and theoretically.6. When the surface receives the direct radiation, surface temperature is much affected by the emissivity of the material.7. The equilibrium temperatures were measured under the radiation of infrared lamp. The surface temperature differs depending on the material, so the selection of the cover material.8. The surface temperature is strongly affected by the wind in the outside.