Tafur-Escanta, P.; Valencia-Chapi, R.; López-Paniagua, I.; Coco-Enríquez, L.; Muñoz-Antón, J. Supercritical CO2 Binary Mixtures for Recompression Brayton sCO2 Power Cycles Coupled to Solar Thermal Energy Plants. Energies2021, 14, 4050.
Tafur-Escanta, P.; Valencia-Chapi, R.; López-Paniagua, I.; Coco-Enríquez, L.; Muñoz-Antón, J. Supercritical CO2 Binary Mixtures for Recompression Brayton sCO2 Power Cycles Coupled to Solar Thermal Energy Plants. Energies 2021, 14, 4050.
Tafur-Escanta, P.; Valencia-Chapi, R.; López-Paniagua, I.; Coco-Enríquez, L.; Muñoz-Antón, J. Supercritical CO2 Binary Mixtures for Recompression Brayton sCO2 Power Cycles Coupled to Solar Thermal Energy Plants. Energies2021, 14, 4050.
Tafur-Escanta, P.; Valencia-Chapi, R.; López-Paniagua, I.; Coco-Enríquez, L.; Muñoz-Antón, J. Supercritical CO2 Binary Mixtures for Recompression Brayton sCO2 Power Cycles Coupled to Solar Thermal Energy Plants. Energies 2021, 14, 4050.
Abstract
In this work, an evaluation and quantification of the impact of using mixtures based on Supercritical Carbon Dioxide "s-CO2" (s-CO2/COS, s-CO2/H2S, s-CO2/NH3, s-CO2/SO2) are made as a working fluid in simple and complex recompression Brayton s-CO2 power cycles configurations that have pressure drops in their components. These cycles are coupled to a solar thermal plant with parabolic-trough collector (PTC) technology. The methodology used in the calculation performance is to establish values of the heat recuperator total conductance (UAtotal) between 5 and 25 MW/K. The main conclusion of this work is that the cycle's efficiency has improved due to s-CO2 mixtures as working fluid; this is significant compared to that obtained using the standard fluid (pure s-CO2). Furthermore, a techno-economic analysis is carried out that compares each configuration's costs using pure s-CO2 and a mixture of s-CO2/COS with a molar fraction (70/30) respectively as working fluid where relevant results are obtained. These results show that the best configuration in terms of thermal efficiency and cost is the RCC-RH for pure sCO2 with values of 41.25% and 2811 $/kWe, while for the mixture sCO2/COS, the RCC-2RH configuration with values of 45, 05% and 2621 $/kWe is optimal. Using the mixture costs 6.75% less than if it is used the standard fluid (s-CO2).
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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