Patent ID: 8161748

Claim:
An engine comprising a combustion chamber, wherein a mixture of oxygen, as O 2 , and hydrogen, as H 2 , is combusted, creating steam, wherein at least a portion of the oxygen is obtained by the separation of air, wherein the separation of air is selected from the group consisting of: (a) cryogenic separation, (b) membrane separation, (c) pressure swing adsorption, and any combination thereof, wherein the air separation is at least partially powered by torque or mechanical rotating energy, wherein the torque or mechanical rotating energy is at least partially obtained from at least one of: the steam turning a steam turbine, the steam in the combustion chamber driving a piston, the steam in the combustion chamber driving a steam turbine, and any combination therein, and wherein the temperature of combustion is at least partially controlled with the addition of water or steam to the combustion chamber in a way that maintains the temperature of combustion or of combustion exhaust.