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What is a supercritical carbon dioxide turbine?

A supercritical carbon dioxide (sCO2) turbine is a heat engine that uses sCO2 as a working fluid, typically within a closed Brayton cycle, allowing for compact designs and improved performance compared to conventional steam turbines. In the supercritical state, carbon dioxide combines properties of both liquids and gases, allowing it to flow like a gas while maintaining densities closer to those of a liquid, which is useful for turbine operation.