Abstract
A mechanism of nozzle freezing lock phenomenon at hydrogen refueling stations is investigated. Hydrogen filling using a pre-cool system can cause a nozzle freezing lock problems. In those cases, the nozzle cannot be disconnected normally after filling. In this study, a simulated pre-cooled hydrogen filling tests were performed to clarify the mechanism of the nozzle freezing lock phenomenon. It was observed that the nozzle was not able to be disconnected appropriately when the condensed water was frozen in the nozzle. Using a cap covering cold connection part of the nozzle is effective to prevent from the nozzle freezing problem.
