针对跨临界CO
2
汽车空调系统制冷性能较差的问题
分析了回热器大小对系统性能和运行参数的影响
在汽车空调测试环境实验室中搭建了一个可变回热量的跨临界CO
2
制冷系统实验台
在35、38和41℃环境温度下
保持压缩机转速为3 500r/min
通过旁通阀调节回热量
测量了不同排气压力下全回风系统的稳态性能
分析了回热量对系统制冷量和能效比的提升作用
以及对压缩机运行参数的影响。结果表明:排气压力为10 MPa时
35、38和41℃下
使用回热器后系统的最大能效比分别提高了14.2%、23.3%和33.2%
制冷量也增加了14.3%~33.3%;使用回热器可以改善换热器压力损失
但同时会引起排气温度升高;相同温度下
系统最大回热度一般随环境温度升高而减小;回热器的使用可以有效提高系统性能
但也会引起压缩机压比增大和排气温度的上升。在跨临界CO
2
制冷循环的回热器大小设计时
需要兼顾性能和安全。
Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai, China,Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai, China,Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai, China,Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai, China,Shanghai High Efficient Cooling System Research Center, Shanghai, China,Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai, China,Shanghai High Efficient Cooling System Research Center, Shanghai, China.Heating performance evaluation of a CO 2 heat pump system for an electrical vehicle at cold ambient temperatures[J].Applied Thermal Engineering,2018.
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