论文部分内容阅读
冷剂在热交换器管内的流型随蒸气质量、管径、冷剂流速和冷剂特性而变化.冷剂流速高时会导致雾流,此时质量为0.8～1.0.在此流型下,液膜从管壁分离扩散开来,从而干扰了传热.一般来说,传热系数随流速而增加.但是,冷剂流动时的压降同时随流速增加而增大,雾流的区域也扩大.为了降低压降和缩小雾流范围,三菱电机株式公社研制成了将蒸气从蒸发的冷剂流体中逸出的小型气液分离器,把这种分离器安装在流型为环状的蒸发器的中部对这种气液分离器的效果进行了试验鉴定,其结论如下:(1)平均传热系数可增加30～60%;(2)压降可低20～30%;(3)制冷量可增加2～9%.
The flow pattern of the refrigerant in the heat exchanger tube varies with the vapor mass, the diameter of the pipe, the flow rate of the refrigerant and the characteristics of the refrigerant. When the flow rate of the refrigerant is high, mist flow is caused, and the mass is 0.8 to 1.0. , The liquid film from the separation of the wall spread, thus interfering with the heat transfer.In general, the heat transfer coefficient increases with the flow rate.However, the pressure drop at the same time as the flow rate of refrigerant increases, the area of the flow In order to reduce pressure drop and reduce the scope of the fog flow, Mitsubishi Electric Corporation developed a small vapor-liquid separator to escape the vapor from the evaporated refrigerant fluid, the separator installed in the flow pattern for the ring Of the evaporator in the middle of the effect of this gas-liquid separator were tested identification, the conclusions are as follows: (1) the average heat transfer coefficient can be increased by 30 to 60%; (2) the pressure drop can be lower 20 to 30%; ( 3) The cooling capacity can be increased by 2 ~ 9%.