对蒸汽在竖直管内的凝结换热进行了实验研究．实验表明，含有不凝性气体（空气）时，蒸汽在光管内的凝结换热性能显著下降，而当蒸汽流速增大时，下降程度减小，进一步证实了现有的理论结果．特别是，实验发现，当管内插入大空隙率花丝元件时，能显著改善不凝性气体对蒸汽凝结换热的不利影响．此结果将对非共沸制冷工质的广泛使用产生深远影响． Experimental study on the condensation heat transfer of steam in vertical tube was carried out. Experiments show that when the non-condensable gas (air) is contained, the condensation heat transfer performance of the steam in the light pipe decreases significantly. When the steam velocity increases, the decrease of the heat transfer decreases, which further confirms the existing theoretical results. In particular, it has been experimentally found that when a hollow vial element is inserted into a tube, the adverse effect of the non-condensable gases on the heat transfer of steam condensation can be significantly improved. This result will have a profound impact on the widespread use of non-azeotropic refrigerants.