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CO_2热泵与采用传统工质的热泵相比,具有低温适用性、环境友好性、设备紧凑、能够制取高温度热水等诸多优势。但是随着环境温度的降低,系统会出现排气温度升高、制热量下降等问题。通过对改进型单级压缩循环、双级压缩循环、准二级压缩循环、双极耦合系统、其他辅助加热方式的国内外研究现状进行对比分析,总结了各种循环方式主要的技术特点及不足,并提出了相关建议。这对于促进寒冷地区CO_2热泵系统的发展具有重要参考价值。
Compared with the heat pump with traditional refrigerant, the CO_2 heat pump has many advantages such as low temperature applicability, environment friendliness, compact equipment and high temperature hot water. However, with the decrease of ambient temperature, the system will have problems such as the increase of the exhaust temperature and the decrease of the heating capacity. By comparing and analyzing the research status of improved single-stage compression cycle, two-stage compression cycle, quasi-two-stage compression cycle, bipolar coupling system and other auxiliary heating methods at home and abroad, the main technical features and shortcomings of various circulation modes are summarized , And put forward relevant suggestions. This has important reference value for promoting the development of CO 2 heat pump system in cold area.