The degradation of the long-term performance of different types of vaporizers is caused by frosting. An experimental platform was built to study the effect of a double-wall heat transfer tube on heat transfer enhancement and frosting. In the experiment a tube was added to the inner side of the ordinary heat transfer tube and liquid nitrogen was used as the working medium. Twelve working conditions were designed based on different inner diameters (Φ6 mm

Φ8 mm

Φ10 mm) of double-wall heat transfer tubes and inlet flow. The temperature at different measuring points on the surface of the finned tube

the frost thickness

and the fluid temperature at the outlet of the finned tube were tested. The results show that when the inlet flow is 2.5 g/s

the outlet temperatures of the ordinary heat transfer tube

and double-wall heat transfer tube with inner diameters of Φ6 mm

Φ8 mm

and Φ10 mm are 193 K

205 K

200 K

and 199 K

respectively. This means that compared with the ordinary heat transfer tube

the double-wall heat transfer tube effectively delays the frost growth. Among the three tube specifications

the double-wall heat transfer tube with an inner diameter of Φ6 mm has a better effect on delaying the growth of frosting. When the inlet flow is 2.5 g/s

3.5 g/s and 4.5 g/s

using a double-wall heat transfer tube with an inner diameter of Φ6 mm

the lower inlet flow can delay frosting on the fin surface.