Recent Advancement of Thermal Fluid Engineering in the Supercritical CO2 Power Cycle

applied sciences Editorial Recent Advancement of Thermal Fluid Engineering in the Supercritical CO2Power Cycle Jeong Ik Lee 1,* and David Sanchez 2 1Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea 2Department of Energy Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain; [email protected] *Correspondence: [email protected] Received: 29 July 2020; Accepted: 31 July 2020; Published: 3 August 2020   The supercritical CO 2 (S-CO 2 ) power cycle is an emerging energy technology that has potential to revolutionize the conversion process of heat to mechanical or electric power. Currently, the technology development is being actively pursued in many countries thanks to the support of governments and the industry. At the same time, the technology is already being commercialized in the waste heat recovery sector successfully and it is diffusing to other conventional energy source applications such as gas, coal and nuclear power. For renewable energy sources such as concentrated solar power, the S-CO 2 power cycle stems as a technology which can enable a substantial reduction of the cost of electricity, thus contributing to a larger penetration of environmentally friendly, dispatchable and cost-effective energy technologies. This Special Issue contains up-to-date techno-economical information regarding the S-CO 2 power cycle. The contents of this issue cover from component level technologies such as turbine [ 1 – 3 ], compressor [ 4 ] and heat exchanger [ 5 ] to system level information such as cycle analysis [ 6 , 7 ] and economic assessment [ 8 ] of the S-CO 2 power cycle. The articles in the issue were provided by groups of researchers spread across globally and they come from different types of organizations, which also tells how active this area is being researched at the moment. The editors would like to thank all the authors who contributed to this Special Issue and feel very privileged to have had the opportunity to produce this Special Issue. They also hope that this Special Issue contributes to the advancement of the S-CO2power cycle technology by informing and inspiring many researchers in this field. Author Contributions: All authors contributed equally to the preparation of this manuscript. All authors have read and agreed to the published version of the manuscript. Funding: This research received no external funding. Acknowledgments: This publication was only possible with the invaluable contributions from the authors, reviewers, and the editorial team of Applied Sciences. Conflicts of Interest: The authors declare no conflict of interest. References 1. Salah, S.I.; Khader, M.A.; White, M.T.; Sayma, A.I. Mean-Line Design of a Supercritical CO 2 Micro Axial Turbine. Appl. Sci. 2020,10, 5069. [CrossRef] 2. Samad, T.E.; Teixeira, J.A.; Oakey, J. Investigation of a Radial Turbine Design for a Utility-Scale Supercritical CO2Power Cycle. Appl. Sci. 2020,10, 4168. [CrossRef] 3. Wang, Y.; Li, J.; Zhang, D.; Xie, Y. Numerical Investigation on Aerodynamic Performance of SCO 2 and Air Radial-Inflow Turbines with Different Solidity Structures. Appl. Sci. 2020,10, 2087. [CrossRef] 4. Shi, D.; Xie, Y. Aerodynamic Optimization Design of a 150 kW High Performance Supercritical Carbon Dioxide Centrifugal Compressor without a High Speed Requirement. Appl. Sci. 2020,10, 2093. [CrossRef] Appl. Sci. 2020,10, 5350; doi:10.3390/app10155350 www.mdpi.com/journal/applsci Appl. Sci. 2020,10, 5350 2 of 2 5. Seo, H.; Cha, J.E.; Kim, J.; Sah, I.; Kim, Y.-W. Design and Performance Analysis of a Supercritical Carbon Dioxide Heat Exchanger. Appl. Sci. 2020,10, 4545. [CrossRef] 6. Salim, M.S.; Saeed, M.; Kim, M.-H. Performance Analysis of the Supercritical Carbon Dioxide Re-compression Brayton Cycle. Appl. Sci. 2020,10, 1129. [CrossRef] 7. Ham, J.K.; Kim, M.S.; Oh, B.S.; Son, S.; Lee, J.; Lee, J.I. A Supercritical CO 2 Waste Heat Recovery System Design for a Diesel Generator for Nuclear Power Plant Application. Appl. Sci. 2019,9, 5382. [CrossRef] 8. Crespi, F.; S á nchez, D.; Mart í nez, G.S.; S á nchez-Lencero, T.; Jim é nez-Espadafor, F. Potential of Supercritical Carbon Dioxide Power Cycles to Reduce the Levelised Cost of Electricity of Contemporary Concentrated Solar Power Plants. Appl. Sci. 2020,10, 5049. [CrossRef] © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).