Effect of Heat exchanger’s Pressure Drops on the Thermal Efficiency of Brayton Cycles Complex Configurations with s-CO2 Mixtures as Working Fluid

Abstract:

This work analyzes the impact that pressure drops have on the thermal efficiency of Brayton cycles that operate with mixtures based on supercritical carbon dioxide (s-CO2/C2H6, s-CO2/CH4, s-CO2/Kr, and s-CO2/SF6). As a working fluid. Four complex configurations were studied: recompression with two and three reheating’s (RCC-2RH), (RCC-3RH); recompression with main compressor intercooling with two and three reheating's (RCMCI-2RH), (RCMCI-3RH). The performance of the cycle at the design point is evaluated as a design parameter. The methodology applied to calculate it is obtained by establishing values of the heat total recuperator conductance (UAtotal) between 5 and 25 MW/K. The main conclusion of this work is that the cycle’s efficiency has increased due to mixtures compared to pure CO2 as the working fluid. The s-CO2/Kr mixture with a mole fraction of 65/35 is the one with the best …

Año de publicación:

2022

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Fuente:

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