Cool Hybrid Cars

Lawrence Livermore National Laboratory’s Tim Ross at the Lab’s hydrogen refueling station with a test vehicle equipped with an innovative hydrogen tank. Unlike conventional liquid hydrogen tanks in prototype cars, the LLNL pressure vessel was parked for six days without venting evaporated hydrogen vapor. The LLNL development has significantly increased the amount of time it takes to start releasing hydrogen during periods of long-term parking, as compared to today’s liquid hydrogen tanks capable of holding hydrogen for merely two to four days.