Abstract
Discharging the hydrogen gas filled in the high pressurized hydrogen container onboard causes hydrogen adiabatic expansion to change the temperature of the container, components and devices installed in the discharge line.In this study, changes in temperature of container and components were measured during the discharge of hydrogen gas from initial pressure of 70MPa.The results are as follows: 1) The temperature drop of inside of container, boss of container and pressure regulator were -43C, -27C and -24C respectively when hydrogen gas was discharged from 70MPa with a flow rate of 200NL/min. 2) At the beginning of discharge, the rapid increase in hydrogen gas temperature about +20C was observed and then the temperature dropped.
