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Study on the Optimum Paddy Storage by Silo Cooling

粮仓冷却优化储存稻谷的研究

基本信息

批准号：
05660291
负责人：
GOTO Kiyokazu
金额：
$ 1.28万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

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.

利用模型筒仓对稻谷温度随时间的变化进行了测量。研究表明，由于筒仓表面温度远高于环境温度，大量热量进入筒仓内部。因此，研究了防止温度升高的方法。i）太阳辐射被筒仓表面的覆盖材料反射。ii）通过隔热材料隔热。1.表面温度通常比环境温度高20摄氏度。2.通过在表面覆盖铝膜，将表面温度限制在环境温度附近.当储存的谷物温度低时，即使通过使用隔热材料进行太阳辐射，表面温度也变得低于环境温度。然而，这是高于环境温度在夜间。4.利用热传导方程可以计算出筒仓内任意位置的粮食温度.采用铝膜后，筒仓周边区域稻谷的脂肪酸值比普通筒仓高9 mg-KOH/100 g粮。其次，通过实测温度和理论分析，研究了覆盖材料与表面温度的关系。当表面接受直接辐射时，材料的发射率对表面温度的影响很大.在红外灯照射下测定了平衡温度。表面温度不同，这取决于材料，所以选择的覆盖材料。8.地表温度受外界风的影响很大。