强化补气技术应用于空气源热泵的研究进展

Development of Research on Application of Enhanced Vapor Injection Technology in Air-source Heat Pump

在研究空气源热泵产品的低温制热性能时，发现引入基于准二级压缩循环的强化补气（EVI）技术可使热泵应用于低温工况的性能得到明显改善。本文论述了准二级压缩循环的压缩模型和不同强化补气系统的工作原理，比较了强化补气系统与其它系统的差异。从数学模型、实验研究和创新优化三个方面分析了强化补气技术在低温空气源热泵领域的研究现状与进展。总结不同学者对强化补气系统在提高低温制热性能、降低压缩机排气温度等方面的研究结果和实际应用成果后得出，即使在-15℃的低温环境下，强化补气系统可使系统COP提高7．7％～25．0％，排气温度降低6．37—20．36℃。最后，对强化补气系统今后的研究方向进行了展望。

It was found that the introduction of enhanced vapor injection（EVI） technology can significantly improve the performance of airsource heat pump products under low-temperature condition. This technology is based on quasi two-stage compression cycle. The present paper expounded quasi two-stage compression cycle model and different EVI principles. A comparison among EVI system and other systems was made to find their advantages and disadvantages. The paper provides a literature review on heat pump systems with EVI technology from three aspects： mathematical model, experimental study and optimization. The review summarized the research and application achievement of EVI system in improving heating performance, reducing exhaust temperature and other aspects. The results show that even at - 15 ℃ low temperature, EVI systems can increase COP 7.7% -25.0%, and decrease exhaust temperature 6.37 -20.36 ℃. It also prospects the future research direction of EVI system.