Thermodynamic Study of a Supercritical CO2 Brayton Cycle Concept

by Hiep T. Hoang, Michael R. Corcoran, & John W. Wuthrich
Knolls Atomic Power Laboratory

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A supercritical carbon dioxide (S-CO2) Brayton energy conversion system has potential efficiency advantages over ideal gas Brayton systems, and increased compactness or higher power density over comparable saturated or superheated Rankine systems. This work expands on previous S-CO2 Brayton energy conversion systems evaluations performed by the Massachusetts Institute of Technology to develop an understanding of the tradeoffs between system efficiency and power density. This study explores the affects of changing the thermodynamic assumptions and investigates the impact of non-ideal fluid behavior on heat exchanger performance.