气分器增效分离式热虹吸/蒸气压缩复合系统工作特性

Operating characteristics of gas-liquid separator enhanced loop thermosyphon/vapor compression hybrid system

为进一步提升系统的制冷性能和运行稳定性,提出了气液分离器(简称为气分器)增效分离式热虹吸/蒸气压缩复合系统.在热虹吸模式下,利用气分器降低两相管内工质流动阻力,提升系统稳态传热性能、启动性能及运行稳定性.在蒸气压缩模式下,气分器使得饱和蒸气进入冷凝器,提升了冷凝器支路质量流量、冷凝器换热效率及系统性能系数(coefficient of performance,COP).构建了该复合系统的仿真模型,以热虹吸模式为切入点,探究结构参数对热虹吸模式性能的影响.在确定系统结构参数条件下,对比分析了新型系统与传统系统在蒸气压缩模式下的制冷性能差异.结果表明:主回路两相管内径为10 mm,旁路回路气管内径为9 mm,气分器距离地面1.05 m,系统整体高度为1.45 m时,系统性能最佳;任意工况下,新型系统均可获得更加优异的性能,与传统系统相比,新型系统的COP最大值提升了19.70%.

To further improve the cooling performance and operation stability of system,the gas-liquid separator enhanced loop thermosyphon/vapor compression hybrid system was proposed.In the thermosyphon mode,the separator was used to reduce the pressure drop of fluid in the two-phase tube for improving the performance of steady-state heat transfer and start-up and the operation stability of system.In the vapor compression mode,the separator was used to make the saturated vapor into the condenser for increasing the mass flow rate in the condenser and enhancing the system coefficient of performance(COP).The simulation model of the hybrid system was developed to investigate the impact of structural parameters on thermosyphon mode performance.The difference of refrigeration performance between the new system and the conventional system in vapor compression mode was comparatively analyzed under the given structural condition of system.The results show that the system performance is the best when the inner diameters of two-phase tube and gas tube are respective 10 mm and 9 mm with separator height and total system height of respective 1.05 m and 1.45 m.Compared with the conventional system,the new system can achieve better performance under any operating condition,and the maximum COP of the new system is improved by 19.70%.