牧草固定深层太阳能干燥的试验

在由太阳能集热器、干燥塔、鼓风机和测试系统组成的试验台上进行了实时天气状态下的紫花苜蓿太阳能深层干燥试验。试验中将牧草分3层，每层高度1．2m，以便获得不同干燥介质状态，研究了介质状态与牧草温度、含水率的关系。结果表明，太阳能实时干燥过程中干燥介质状态受天气因素影响，而牧草温度及含水率变化与介质温度、相对湿度及牧草所处的位置有关。沿气流方向离介质入口近处温度高，在同一截面处，距干燥塔墙体近处温度高，中线附近温度低。深层干燥过程中不同部位牧草干燥速率不同，草堆边缘干燥速度快，草堆深处干燥速度缓慢；在相同空气流量情况下．介质温度高、相对湿度低时．牧草与介质温差大．有利于干燥。

Experiment on Temperature and Moisture Content of Forage in Deep Bed Solar Drying Process

Deep bed solar drying experiments were conducted for alfalfa.In order to examine the effect of drying element on the deep bed drying of alfalfa,the forage has been set into three layers,each layer was 1.2 m high,and drying experiment was performed in the drying tower at the meantime.Result showed that the drying temperature in real-time solar drying was affected by the weather elements,and the temperature of alfalfa was affected by the air temperature,humidity and the position of alfalfa in bed.Along the ai...