带补气的电动客车热泵空调系统制热特性试验研究

Experimental study on heating characteristics of heat pump air-conditioning system for electric bus with vapor-injected technology

为了研究不同补气方式对电动客车热泵空调系统制热特性的影响,基于准双级压缩的原理,搭建了以R410a为制冷工质的热泵空调系统试验台,并在标准焓差实验室内对该试验台进行性能测试。通过对试验数据的分析发现:在不同试验工况下,相对于不补气模式,低压补气和中压补气模式都能有效地降低压缩机的排气温度,其中低压补气对压缩机排气温度降低更多;2种补气方式都提高了热泵空调系统的制热量、COP、出风温度,其中中压补气模式对这些参数的提升幅度优于低压补气模式。研究结果表明,补气技术能改善热泵空调系统的性能,降低压缩机的排气温度。

In order to study the influence of different vapor injection modes on the heating characteristics of an electric bus heat pump air conditioning system, based on the theory of quasi-two-stage compression, an electric bus heat pump air conditioning system test-bed with R410a refrigerant was built, and the performance test of the system test bench was conducted in the standard enthalpy difference laboratory to study the effect of different replenishment methods on heat performance. Through the analysis of the test data, we can see that compared with ordinary system without vapor injection, the low-pressure vapor injection and middle-pressure vapor injection can reduce the compressor discharge temperature effectively, and the effect of low-pressure vapor injection is more prominent under the difference of test conditions. The two modes of air supply have increased the heating capacity, COP, and outlet temperature of the heat pump air conditioning system. Middle-pressure vapor injection is better than low-pressure vapor injection in terms of these parameters. Investigation results show that the vapor-injected technology can improve the performance parameters of the heat pump air conditioning system and reduce the exhaust temperature of the compressor.