应用环流熏蒸系统结合膜下环流管网处理“热皮粮”的技术与探讨

通过实施以井水屋面喷淋,多种方法和材料粮面实仓压盖为主的隔热控温措施,同时在夜间利用微电脑控制的环流熏蒸系统和换气扇,配合粮堆中埋设的膜下环流管网,排除粮仓空间积热,并置换粮堆表层热流,达到降低"热皮粮"温度的目的。通过上述做法,保证了我库储粮在夏秋季节,不影响中底层粮温的前提下,使表层粮温不超过分月控温标准。

移动式二氧化碳气调储粮新工艺应用分析

移动式二氧化碳气调储粮技术作为气调储粮优化升级在我库从试验到应用已经开展两年多,该工艺杀虫效果好、操作便捷、固定投入少,具有一定的粮食保鲜功效,但部分仓房需经过气密改造方可确保良好的使用效果及费用节省。

Heat Transfer and Flow Analysis in Loop Heat Pipe with Multiple Evaporators Using Network Model

Thermal performance of a loop heat pipe with two evaporators and two condensers was examined using a lumped network model analysis. Thermosyphon-type vertical loop heat pipe and capillary-pump-type horizontal loop heat pipe were calculated by examining the change of heating rate of two evaporators. Calculation results showed that the vapor and liquid flow rates in the loop heat pipe and the thermal conductance of the heat pipe changed significantly depending on the distribution ratio of the heating rate of the multiple evaporators. The thermal performance of the vertical loop heat pipe with two evaporators was also examined and experimental results of flow direction and thermal conductance of the heat pipe agreed with the analytical results. The lumped network model analysis is therefore considered accurate and preferable for the practical design of a loop heat pipe with multiple evaporators.