Study on the Optimum Paddy Storage by Silo Cooling

利用该模型仓，测定了储粮温度随时间的变化。结果表明，筒仓表面温度大大高于环境温度，导致大量热量渗入筒仓内部。为此，对防止温度升高的方法进行了探讨。i)太阳辐射被筒仓表面的被覆物反射。(2)热量由绝缘体隔离。表面温度通常会比环境温度高20oc .2。通过用铝膜覆盖表面，将表面温度限制在环境温度左右。当储粮温度较低时，即使在有太阳辐射的情况下，储粮的表面温度也会低于环境温度。但是，这比夜间的环境温度要高。用热传导方程可以计算出粮仓内任意位置的粮食温度。采用铝膜后，仓内外围区稻米的脂酸值比普通仓高9 mg-KOH/100g粒。其次，利用实测温度和理论推导了被覆材料与表面温度的关系。当表面接受直接辐射时，表面温度受材料发射率的影响很大。在红外灯照射下测定了平衡温度。表面温度因材料的不同而不同，所以盖板材料的选择。地表温度受外界风的强烈影响。

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.