毛细管在小型室内冷库制冷系统中的应用与研究

Application and Research on Capillary Tube in Refrigeration System of Small and Indoor Cold Storage

为了解决小型制冷系统中毛细管设计难的问题,利用数值模拟来初步分析不同长度的毛细管所对应的流量,单根毛细管和两根毛细管并联时的差异情况,然后以冷库一体机这种小型制冷设备来进行试验分析。结果表明:制冷量小于6kW的小型制冷系统中,相同长度的两根毛细管的流量是单根毛细管流量的1.4倍左右;毛细管的流量随着长度的增加呈现非线性的下降趋势;将毛细管盘绕在铜管式气液分离器上不仅可以节省空间,还能增强制冷效率;同时说明了数值模拟在毛细管设计初期具有可行性。

To deal with the difficult problem of capillary design in small refrigeration system, numerical simulation was used to analyze the flow rate of different capillary tubes, the flow difference between a single capillary and two capillary tubes in parallel, and then the simulation results were verified by experiments of all-in-one cold storage machines. The test results showed that, for the refrigerating capacity is less than 6 KW of small refrigeration system, the difference in flow between two capillary tubes and a single capillary are approximately 1.4 times by the same length. The capillary flow decreases non-linearly with the increase of length. The capillary winding in the copper tube of gas-liquid separator not only saves space, but also enhances the refrigeration efficiency. Also, numerical simulation is feasible at the initial stage of capillary design.