A closed loop energy conversion apparatus including a dissociation unit for dissociating water into hydrogen gas and oxygen gas and separating hydrogen gas from oxygen gas. An energy source provides energy to the dissociation unit. Oxygen gas and hydrocarbon gas react in a hydrocarbon combustion unit to form a combustion product comprising carbon dioxide gas and water vapor. A first heat exchanger cools the combustion product and condenses water vapor from the combustion product. A carbon dioxide separator separates carbon dioxide gas from water condensed in the first heat exchanger. Carbon dioxide gas reacts with hydrogen gas in a hydrocarbon synthesis reactor to form a mixture comprising hydrocarbon gas and water vapor. A second heat exchanger cools the mixture and condenses water vapor from the mixture. A hydrocarbon separator separates hydrocarbon gas from water condensed in the second heat exchanger. A conduit system directs oxygen gas from the dissociation unit to the hydrocarbon combustion unit, carbon dioxide gas from the hydrocarbon combustion unit to the hydrocarbon synthesis reactor, water from the hydrocarbon combustion unit and the hydrocarbon synthesis reactor to the dissociation unit, hydrogen gas from the dissociation unit to the hydrocarbon synthesis reactor, and hydrocarbon gas from the hydrocarbon synthesis reactor to the hydrocarbon combustion unit.
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