跨临界CO2制冷(热泵)系统中毛细管研究进展

摘要

Capillary tube is commonly used as expansion device in small refrigeration systems and heat pump systems. However, its internal flow characteristic is different from normal CFCs and HCFCs when it is applied in CO2 transcritical refrigeration (heat pump) system. A review of the capillary tube as expansion device in the CO2 transcritical refrigeration ( heat pump) system research was introduced. The current status of domestic and foreign research on capillary math model, experimental research, critical flow calculation and its effect on the system was also discussed. Some problems exist in recent researches were proposed and the development directions in this field were discussed.%毛细管应用于CO2跨临界循环时,其内部流动不同于普通CFCs和HCFCs,针对毛细管作为跨临界CO2制冷(热泵)系统节流机构的研究进行了回顾.主要从CO2毛细管模型、实验研究、临界流以及毛细管对系统的影响4个方面详细介绍了国内外的研究进展.阐述了目前研究存在的几个问题,并探讨了这一领域内研究的发展方向.