Author
Junhyun Cho
Bio: Junhyun Cho is an academic researcher from Kier Group. The author has contributed to research in topics: Supercritical carbon dioxide & Heat exchanger. The author has an hindex of 4, co-authored 15 publications receiving 47 citations.
Papers
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01 Nov 2014
16 citations
17 Aug 2017
15 citations
Patent•
20 Jun 2016
TL;DR: In this paper, a supercritical carbon dioxide power generation system is described, which includes a regenerator, a turbine, a heat recoverer, a condenser, a compressor, an expansion valve, a flash tank, heat exchanger, and an ejector.
Abstract: A supercritical carbon dioxide power generation system is provided. The supercritical carbon dioxide power generation system may include a regenerator, a turbine, a heat recoverer, a condenser, a compressor an expansion valve, a flash tank, a heat exchanger, and an ejector, and may utilize waste heat of the supercritical carbon dioxide power generation system.
11 citations
17 Aug 2017
9 citations
30 Aug 2018
TL;DR: In this article, the development of a 60-kWe turbo generator that uses supercritical carbon dioxide (sCO2) cycle technology at the lab scale is described, and the design concept for the turbo generator involved using commercially available components to reduce the developmental time and to increase the reliability of the machine.
Abstract: The development of a 60-kWe turbo generator that uses supercritical carbon dioxide (sCO2) cycle technology at the lab scale is described herein. The design concept for the turbo generator involved using commercially available components to reduce the developmental time and to increase the reliability of the machine. The developed supercritical partial-admission CO2 turbine has a single-stage axial-type design with a 73-mm rotor mean diameter. The design of the sCO2 turbine uses impulse and partial admission to reduce the axial force and rotational speed. We simulated the flow of the designed sCO2 turbine. To increase the simulation accuracy, a real gas property table is coupled with the flow solver. The turbine performance test apparatus and test results are described; then, the turbine is continuously operated for 44 min. The maximum turbine power is 25.4 kW, and the maximum electric power is 10.3 kWe.
8 citations
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TL;DR: A review of the current state-of-the-art of sCO 2 power generation systems, with a focus on technical and operational issues, is provided in this article, where the authors discuss the current research and development status in the areas of turbomachinery, heat exchangers, materials and control system design with priority given to experimental prototypes.
169 citations
TL;DR: SCBC is promising, but it still requires more researches on commercialization, and future researches should focus on raising the efficiency of turbomachinery, designing compact heat exchangers, building up large-scale experimental facility, optimizing configurations of SCBC, and improving control strategies, etc.
161 citations
62 citations
TL;DR: In this paper , the state-of-the-art and existing problems of the supercritical carbon dioxide (S-CO2) power technology are reviewed from the perspective of system analysis and component design.
53 citations
11 Mar 2020
TL;DR: In this paper, a brief overview of the sCO2 power cycle technology is presented, including key technological challenges with the major components such as turbomachinery and heat exchangers.
Abstract: In the European Industry, 275 TWh of thermal energy is rejected into the environment at temperatures beyond 300 °C. To recover some of this wasted energy, bottoming thermodynamic cycles using supercritical carbon dioxide (sCO2) as working fluid are a promising technology for the conversion of the waste heat into power. CO2 is a non-flammable and thermally stable compound, and due to its favourable thermo-physical properties in the supercritical state, can lead to high cycle efficiencies and a substantial reduction in size compared to alternative heat to power conversion technologies. In this work, a brief overview of the sCO2 power cycle technology is presented. The main concepts behind this technology are highlighted, including key technological challenges with the major components such as turbomachinery and heat exchangers. The discussion focuses on heat to power conversion applications and benefits of the experience gained from the design and construction of a 50 kWe sCO2 test facility at Brunel University London. A comparison between sCO2 power cycles and conventional heat to power conversion systems is also provided. In particular, the operating ranges of sCO2 and other heat to power systems are reported as a function of the waste heat source temperature and available thermal power. The resulting map provides insights for the preliminary selection of the most suitable heat to power conversion technology for a given industrial waste heat stream.
48 citations