CO2跨临界循环中非绝热毛细管传热性能的试验研究

摘要

为了测试在相同工况下，CO2跨临界循环非绝热毛细管各区段的换热能力；并测试毛细管进口压力10MPa，进口温度39℃，蒸发温度7℃，制冷量1kW 时，5种内径毛细管所需的长度，以及毛细管换热量随毛细管管径的变化情况，搭建了 CO2跨临界循环试验台，进行了相关试验，试验结果表明：非绝热毛细管在超临界区域换热能力最强，亚临界两相区换热能力最弱，毛细管换热量随毛细管内径增大而增加。%In order to test under the same conditions,CO2 trans critical cycle non-adiabatic capillary tubes of various sections of the heat transfer ability.And test the capillary inlet pressure 10MPa,inlet temperature is 39℃,evaporation temperature of 7℃, 1kW refrigerating capacity,length of 5 kinds of inner diameter of capillary and capillary for calorimetric changes with the capillary diameter,set up a CO2 trans critical cycle experiment station,has been tested.The test results show that:non-adiabatic capillary tube in the supercritical region for heat capacity of the strongest,the subcritical two-phase region heat capacity of the weakest ex-change and heat transfer in capillary with the capillary diameter increase and increase.