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列车空调机组不同于传统建筑空调,其运行环境恶劣、工况复杂、机组尺寸受限等,现有典型地铁空调机组的COP只有2.0~2.3。本文建立了一个经实验数据校正的地铁空调机组仿真模型,分析得出由于冷凝风量下降导致机组性能变差,并提出回收机组排风的冷量来改善地铁空调机组性能的新思路。仿真结果显示,额定工况下,使用排风过冷的空调机组COP可提升7.5%;而在非额定工况下,COP的提升幅度进一步增大。此外,通过仿真发现排风过冷空调机组的制冷COP对过冷排风风量和过冷器换热面积不敏感。本文的研究成果可为地铁空调机组的优化设计提供参考。
The train air conditioning unit is different from the traditional building air conditioning, its operating environment is harsh, working conditions are complex, the unit size is limited, the typical existing COPC air conditioning unit COP only 2.0 ~ 2.3. In this paper, a simulation model of metro air conditioning unit calibrated by experimental data is established. The result shows that the performance of metro air conditioning unit is degraded due to the decrease of condensing air volume. The simulation results show that under rated conditions, the COP of air-conditioning units with exhaust cooling is increased by 7.5%, while in non-rated conditions, the increase of COP is further increased. In addition, through the simulation, it is found that the COP of the cooling system is not sensitive to the cooling air volume and the area of the subcooler. The research results of this paper can provide a reference for the optimization design of air conditioning unit in subway.