scholarly journals Extension of the supercritical carbon dioxide brayton cycle to low reactor power operation: investigations using the coupled anl plant dynamics code-SAS4A/SASSYS-1 liquid metal reactor code system.

2012 ◽  
Author(s):  
A. Moisseytsev ◽  
J. J. Sienicki
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Liquid Metal ◽  
Reactor Power ◽  
Brayton Cycle ◽  
Code System ◽  
Liquid Metal Reactor ◽  
Plant Dynamics ◽  
Power Operation ◽  
Supercritical Carbon

Transient Accident Analysis of a Supercritical Carbon Dioxide Brayton Cycle Energy Converter Coupled to an Autonomous Lead-Cooled Fast Reactor

2006 ◽  
Author(s):  
Anton Moisseytsev ◽  
James J. Sienicki
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Fast Reactor ◽  
Plant Response ◽  
Passive Safety ◽  
Brayton Cycle ◽  
Whole Plant ◽  
Plant Dynamics ◽  
Accident Scenarios ◽  
Supercritical Carbon

The Supercritical Carbon Dioxide (S-CO2) Brayton Cycle is a promising advanced alternative to the Rankine saturated steam cycle and recuperated gas Brayton cycle for the energy converters of specific reactor concepts belonging to the U.S. Department of Energy Generation IV Nuclear Energy Systems Initiative. A new plant dynamics analysis computer code has been developed for simulation of the S-CO2 Brayton cycle coupled to an autonomous, natural circulation Lead-Cooled Fast Reactor (LFR). The plant dynamics code was used to simulate the whole-plant response to accident conditions. The specific design features of the reactor concept influencing passive safety are discussed and accident scenarios are identified for analysis. Results of calculations of the whole-plant response to loss-of-heat sink, loss-of-load, and pipe break accidents are demonstrated. The passive safety performance of the reactor concept is confirmed by the results of the plant dynamics code calculations for the selected accident scenarios.

Computational Fluid Dynamics of Supercritical Carbon Dioxide Turbine for Brayton Thermodynamic Cycle

2008 ◽  
Author(s):  
Wi S. Jeong ◽  
Tae W. Kim ◽  
Kune Y. Suh
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Liquid Metal ◽  
Gas Turbine ◽  
High Efficiency ◽  
Thermodynamic Cycle ◽  
Rankine Cycle ◽  
Energy Conversion Efficiency ◽  
Brayton Cycle ◽  
Supercritical Carbon

The supercritical gas turbine Brayton cycle has been adopted in the secondary loop of the Generation IV Nuclear Energy Systems, and also planned to be installed in power conversion cycles of the nuclear fusion reactors. Supercritical carbon dioxide (SCO2) is one of widely considered fluids for this application. The potential beneficiaries include the Secure Transportable Autonomous Reactor - Liquid Metal (STAR-LM), the Korea Advanced Liquid Metal Reactor (KALIMER), and the Battery Omnibus Reactor Integral System (BORIS) which is being developed at the Seoul National University. The reason for these welcomed applications is that the SCO2 Brayton cycle can possibly achieve higher energy conversion efficiency than the steam turbine Rankine cycle. Gas turbine design is crucial part in achieving this high efficiency. In this paper, a one-dimensional gas turbine analysis methodology is applied for optimal design of the component. Case study result shows that the entire turbine efficiency is increased as hub radius is increased for a same number of stage conditions. Comparing the efficiency which is applied the boundary condition, 4 stage turbines have optimal efficiency.

Numerical Simulation of the Performance of an Axial Compressor Operating With Supercritical Carbon Dioxide

2018 ◽  
Author(s):  
Jinlan Gou ◽  
Wei Wang ◽  
Can Ma ◽  
Yong Li ◽  
Yuansheng Lin ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Numerical Simulation ◽  
Supercritical Carbon Dioxide ◽  
Critical Point ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Axial Compressor ◽  
Brayton Cycle ◽  
Supercritical Carbon

Using supercritical carbon dioxide (SCO2) as the working fluid of a closed Brayton cycle gas turbine is widely recognized nowadays, because of its compact layout and high efficiency for modest turbine inlet temperature. It is an attractive option for geothermal, nuclear and solar energy conversion. Compressor is one of the key components for the supercritical carbon dioxide Brayton cycle. With established or developing small power supercritical carbon dioxide test loop, centrifugal compressor with small mass flow rate is mainly investigated and manufactured in the literature; however, nuclear energy conversion contains more power, and axial compressor is preferred to provide SCO2 compression with larger mass flow rate which is less studied in the literature. The performance of the axial supercritical carbon dioxide compressor is investigated in the current work. An axial supercritical carbon dioxide compressor with mass flow rate of 1000kg/s is designed. The thermodynamic region of the carbon dioxide is slightly above the vapor-liquid critical point with inlet total temperature 310K and total pressure 9MPa. Numerical simulation is then conducted to assess this axial compressor with look-up table adopted to handle the nonlinear variation property of supercritical carbon dioxide near the critical point. The results show that the performance of the design point of the designed axial compressor matches the primary target. Small corner separation occurs near the hub, and the flow motion of the tip leakage fluid is similar with the well-studied air compressor. Violent property variation near the critical point creates troubles for convergence near the stall condition, and the stall mechanism predictions are more difficult for the axial supercritical carbon dioxide compressor.

scholarly journals Advanced Supercritical Carbon Dioxide Brayton Cycle Development

2015 ◽  
Author(s):  
Mark Anderson ◽  
James Sienicki ◽  
Anton Moisseytsev ◽  
Gregory Nellis ◽  
Sanford Klein
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Brayton Cycle ◽  
Supercritical Carbon

Supercritical Carbon Dioxide Heat Transfer in Horizontal Semicircular Channels

2012 ◽  
Vol 134 (8) ◽  
Author(s):  
Alan Kruizenga ◽  
Hongzhi Li ◽  
Mark Anderson ◽  
Michael Corradini
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Heat Exchanger ◽  
Supercritical Carbon Dioxide ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Brayton Cycle ◽  
Heat Exchanger Design ◽  
Transfer Behavior ◽  
Supercritical Carbon

Competitive cycles must have a minimal initial cost and be inherently efficient. Currently, the supercritical carbon dioxide (S-CO2) Brayton cycle is under consideration for these very reasons. This paper examines one major challenge of the S-CO2 Brayton cycle: the complexity of heat exchanger design due to the vast change in thermophysical properties near a fluid’s critical point. Turbulent heat transfer experiments using carbon dioxide, with Reynolds numbers up to 100 K, were performed at pressures of 7.5–10.1 MPa, at temperatures spanning the pseudocritical temperature. The geometry employed nine semicircular, parallel channels to aide in the understanding of current printed circuit heat exchanger designs. Computational fluid dynamics was performed using FLUENT and compared to the experimental results. Existing correlations were compared, and predicted the data within 20% for pressures of 8.1 MPa and 10.2 MPa. However, near the critical pressure and temperature, heat transfer correlations tended to over predict the heat transfer behavior. It was found that FLUENT gave the best prediction of heat transfer results, provided meshing was at a y+ ∼ 1.

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