Expansion Work Recovery of Hydrogen for a FC-Truck-Tentative Design of an Expansion Machine

Hydrogen powered vehicles use high-pressure reservoirs from which the gas is transferred to low-pressure fuel-cell via a classical pressure reduction valve. In these systems no expansion work recovered and question addressed of potential increase global efficiency by using an machine between reservoir electrochemical reactor. This paper investigates feasibility such machine, evaluates mechanical constraints in terms forces, torques produced power numeric simulation. It further energetic contribution whole conversion chain hydrogen common electrical network on board. A low-energy system addresses real benefit investment.