| 摘要: |
| 本文提出一种电动汽车引射空调系统，该系统将车内蒸发器设计成前后排分离形式，并在其间加入引射器，以提高压缩机吸气压力，形成梯级蒸发，从而优化系统性能。实验研究了在不同蒸发温度、冷凝温度工况下电动汽车引射空调系统的性能，并与传统空调系统进行了对比。实验结果表明：在不同制冷工况下，电动汽车引射空调系统性能始终优于传统空调系统性能，且随着蒸发温度的升高或冷凝温度的降低，电动汽车引射空调系统性能改善幅度逐渐增大。在实验工况范围内，相比于传统空调系统，电动汽车引射空调系统制冷量增大了约11.10%~14.57%，系统COP增大了约13.09%~16.61%。实验发现，系统制冷量中后排换热量仅占10.93%~13.51%，其换热潜力尚没有充分释放，可通过调节毛细管长度及改善引射器引射比来增大后排蒸发器的工质流量，以进一步改善系统COP。 |
| 关键词: 电动汽车 空调系统 引射器 性能系数 |
| DOI： |
| 投稿时间：2021-08-10 修订日期：2021-09-26
|
| 基金项目:国家自然科学基金（51176142）资助项目。 |
|
| Experimental Study on Performance of Air Conditioning System with Ejector for Electric Vehicle |
| Du Xiaolu,Guo Xianmin,Zhang Dandan |
| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce) |
| Abstract: |
| In this study an air conditioning system with an ejector is proposed for electric vehicles. The indoor evaporator is designed as a separate front and rear evaporator. An ejector is added between the front and rear evaporators to increase the suction pressure of the compressor, and to form a stepped evaporation in the front and rear evaporators to optimize the performance of the system. The performance of the air conditioning system with an ejector for an electric vehicle was studied experimentally under different evaporation and condensation temperatures, and was compared with that of the traditional air conditioning system for electric vehicles. The experimental results indicated that the performance of the air conditioning system with an ejector for an electric vehicle is always better than that of a traditional air conditioning system under different refrigeration conditions. The performance improvement of the air conditioning system with an ejector gradually increases with an increase in the evaporation temperature or a decrease in the condensation temperature. In the range of the experimental conditions, the refrigeration capacity of the air conditioning system with an ejector increased by approximately 11.10%–14.57%, and the coefficient of performance (COP) increased by approximately 13.09%–16.61% compared with the traditional air conditioning system for electric vehicles. It was found in experiments that the heat transfer of the rear evaporator only accounts for 10.93%–13.51% of the system refrigeration capacity, and its heat transfer potential is not fully released. The flow rate of the refrigerant in the rear evaporator can be increased by adjusting the length of the capillary tube and improving the entrainment ratio of the ejector to further improve the COP of the system. |
| Key words: electric vehicle air conditioning system ejector experimental study coefficient of performance |
