Which mechanism limits efficiency when high-temperature supercritical CO2 Brayton cycle power plants operate below design pressure?

💡 Explanation

When supercritical CO2 Brayton cycle power plants operate below their design pressure, the heat exchanger effectiveness decreases because the density and heat capacity of the CO2 working fluid are significantly lower, reducing convective heat transfer. Therefore, reduced heat exchanger effectiveness results, rather than blade stress, surge stability or increased viscosity variations which have a weaker dependency on the parameters.

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