Abstract
Systematic dew and frost point data were required on the assumption that occlusions of pipes or instabilities of flow systems would occur due to condensation of high boiling point residual gases, such as water vapors, in high pressure hydrogen under rapid hydrogen filling processes in hydrogen stations for FCVs. Dew point measurement system with high pressure test cell utilizing cooled mirror technique with visible image analysis were designed and produced. Measurements with H_2+H_2O standard gases for detecting generation and growth of frosts on the mirror surface were carried out to verify basic functions of the system. Dew point estimation procedures for phase equilibrium systems with solid phases as condensed phases were also considered.
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