The EPS heat engine uses industrial grade liquid CO2 as the working fluid, which does not have practical temperature or pressure working limits.
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The turbomachinery pumps the liquid CO2 to high pressure and passes through a combination of recuperators and waste heat exchangers (without using a secondary oil loop) before entering the turbo-expander, which drives the shaft that in turn drives a generator.
Effluent CO2 exits the turbine, and passes through a series of recuperators to exchange more heat, and finally enters the condenser where it is converted back to liquid CO2.
Exiting the condenser, the liquid CO2 re-enters the pump to repeat the cycle.
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