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In hydrogen stations for fuel cell vehicles, a rapid filling process of high pressure hydrogen to a tank on the vehicle is requested, and there are some concerns that possible condensation of residual water at a low temperature section in the fuelling system leads to occlusion in pipes or instability of flow system. In the present investigation, dew and frost point measurement system for residual water in high pressure hydrogen utilizing cooled mirror technique with original image analysis had been designed and developed. Frost point measurements with hydrogen-water standard gases under conditions of 5~10 MPa, 1.5~55 ppm were carried out systematically. Frost point estimation procedures were also developed utilizing two types of equations of states, and experimental data with conditions of low water concentration and high total pressure were quite well in agreement with prediction data. Interaction parameters in the equations of states were also determined by new frost point data. [

Dew and frost point estimation of residual water in high pressure hydrogen for conditions of hydrogen filling stations.