中文摘要：

研究了将微通道换热器应用于CO2循环中作为蒸发器的性能和其对CO_2系统性能的影响。实验结果表明,在系统中微通道换热器运行平稳,其在CO2系统中作为蒸发器换热量可达3.75 kW,热量体积比为6.35×10~4 kW/m~3,微通道换热器制冷剂侧的换热系数最高可以达到8.5 kW/（m~2·K）,微通道蒸发器换热效能达到90%以上,同时蒸发器制冷剂侧的压降在40 kPa以内,相对于CO2跨临界循环的高运行压力,压力损失很小。

英文摘要：

The micro-channels heat exchanger has been studied as an evaporator for CO2 circulation as well as the influence on system performance.The experimental results show that the microchannel heat exchanger in the system running steadily, and transfers over 3750 W heat energy with 6.35104 kW/m3 volume ratio. Frthermore, The heat transfer coefficient of the side of refrigerant can get up to 8.5 kW/（m2.K）, and heat transfer efficiency exceed 90%. Meanwhile, Compared with the high working pressure of transcritical carbon dioxide cycle, the pressure drop of he side of refrigerant in microchannel heat exchanger is within 40 kPa.