Performance comparison between no-vent and vented fills in vertical thermal-insulated cryogenic cylinders

Vented and no-vent fills are two main techniques applied in cryogenic fields for different purposes. No-vent fills are promising for dangerous or precious cryogens, especially in a low-g environment. This paper is to present the comparative results of both pressure and temperature in the vented and no-vent fills for a 180-L cryogenic cylinder. Emphases are laid on the analysis of temperature distribution of cryogens and wall temperature, and analysis of comparison between incoming temperature, saturation temperature and bulk temperature. By test comparison of vented and no-vent fills, different thermodynamic states in the receiver tanks with different filling configurations are revealed. The experimental data are provided as supports of valid assumptions and are useful for modification of models.