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No, this is not a perpetual machine. The trick is let the CO2 loses its internal energy by rapid discharge. And since the cold liquid CO2 is at -45 degree Celsius, all the heat energy above this temperature become energy source which can raise back the temperature of CO2 to room temperature. So there is no energy loss like in high temperature combustion system. However, there is about 5% of absorbed energy needed to return the CO2 to the high pressure level for recreating the cold liquid state again. Up to 30% can be converted to do mechanical work. The rest of energy needed to raise the CO2 temperature back to at least 20 degree Celsius, by freezing or condensing water from air, wastewater or seawater. Otherwise, the system will freeze to a halt. So it requires external heat to function. The beautiful thing is a low 20 degree Celsius can do. But higher temperature will deliver more power.

Thanks for your info.

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