Practical Considerations in Scaling Supercritical Carbon Dioxide Closed Brayton Cycle Power Systems

by Robert L. Fuller & William Batton
Barber-Nichols Inc.

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The supercritical CO2 closed Brayton cycle offers a high efficiency power generation system from relatively low temperature sources. The thermodynamic properties of CO2 including the high density make the turbomachinery and heat exchangers very compact. Unique challenges exist in the design of power systems using super critical CO2. The challenges to be addressed depend on the power level and the thermodynamic cycle. Several power levels and thermodynamic cycles are presented. Turbine and compressor design, power conversion technology, seals, bearings, and rotor dynamics are some of the items discussed.