SUPPLEMENTAL COOLING SYSTEMS FOR FUEL CELL POWERED VEHICLES WITH LIQUID HYDROGEN

A cooling system comprises a liquid hydrogen storage tank, a liquid hydrogen metering pump having a pump inlet in fluid communication with the liquid hydrogen storage tank, and a pump outlet, a hydrogen evaporator heat exchanger having an evaporator inlet in fluid communication with the pump outlet, and an evaporator outlet, a hydrogen gas accumulator having an accumulator inlet in fluid communication with the evaporator outlet, and an accumulator outlet, a hydrogen fuel cell system comprising at least one hydrogen fuel cell having a fuel cell inlet in fluid communication with the accumulator outlet, and a coolant circuit comprising a first coolant path disposed in thermal contact with the hydrogen evaporator heat exchanger.