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Net workdone in brayton cycle5/6/2023 Then the progresses in the experimental study of integrated S-CO2 Brayton cycle test loops are reviewed comprehensively to shed a light on its technical maturity in laboratory. The characteristics of S-CO2 power cycle are presented first to explain the distinctive features of this power cycle. This paper is a review of the research activities which have been carried out for S-CO2 power cycle based nuclear applications worldwide. An update of research activities is needed to identify the unique research interests and challenges of S-CO2 power cycle based nuclear applications. It can also be used as a self-propellant and self-sustaining decay heat removal system to enhance the safety of existing commercial nuclear power plant. S-CO2 power cycle can be used as power conversion system for almost all the nuclear power systems including small modular reactor (SMR), Generation IV reactor and fusion reactor. Reversed Carnot cycle is the same as that of the conventional Carnot Cycle except for the direction of the processes.Supercritical carbon dioxide (S-CO2) Brayton cycle has many advantages including high power conversion efficiency at mediate temperature, compact configuration, high system simplicity and low efficiency loss using dry cooling, which make it well suited to nuclear reactor applications. Heat rejected to a high-temperature-reservoir is Q h.Heat absorbed from low-temperature-reservoir is Q l.The direction of heat and work interactions are totally reversed, thus Reversed Carnot CycleĬarnot cycle is a reversible cycle, and it becomes the Carnot refrigeration cycle when the process reversed. But external work is required in order to move the heat in the reverse direction. This fact becomes the basis for the second law of thermodynamics. Thus the efficiency of the heat engine is higher when operates on super-heated steam temperature.Ĭarnot Cycle and Second law of thermodynamics:Ĭarnot cycle clearly demonstrated the fact that the heat is absorbed from the high-temperature source called reservoir and the heat is rejected to sink. Heat engine efficiency depends on the maximum and minimum temperature of the cycle:Ĭarnot states that the efficiency of the heat engine is independent of the type of fluid and only depends upon the maximum and minimum temperatures during the cycle. Thus the net work done is given by the area under the path 1-2-3-4-1. Work-done on the gas during the compression process is the area given under the curve 3-4-1 Work done by the gas during the expansion process is the area given under the curve 1-2-3. The energy sink is replaced with insulation and the temperature of the gas increases from T l to T h during the compression process. (Reversible adiabatic compression temperature increases from T l to T h) The amount of heat rejected during the process is Q l. When an external force pushes the piston inwards for doing the work on gas, then the temperature of the gas increases.īut the temperature of the gas maintained constant by rejecting the heat to the sink. (Reversible Isothermal Compression, T l = constant)Īt stage-3, the Heat sink replaced the cylinder head insulation at temperature T l. This process is called reversible as well as adiabatic (note that engineering thermodynamics has a specific definition for systems and processes).
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