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helium cycle to below that of the supercritical COB2B cycle. Based on the net efficiency the supercritical COB2B cycle at 550oP PC turbine inlet temperature is fully competitive with the helium cycle at 850oP PC. This does not include the other advantages of the COB2B cycle such as its simpler and more compact system that operates at significantly lower temperature, where operating experience with structural materials is abundant. However, if very high- temperature reactors and high temperature materials are developed then the helium cycle can become more efficient than the supercritical COB2B cycle, at a turbine inlet temperature greater than 950oP PC. One should expect, however, that developing the materials for the helium cycle would also broaden the material selection menu for the COB2B cycle as well, which would allow the COB2B cycle to also operate at higher temperatures (e.g. to ~ 750oP PC). 60 50 40 30 20 10 0 350 450 550 650 750 850 950 Supercritical CO2 cycle Helium Brayton cycle Supercritical steam cycle Superheated steam cycle Turbine Inlet Temperature (oC) Figure 13.19 Cycle efficiency comparison of advanced power cycles High temperature operation aside, the supercritical COB2B cycle dominates in the range of medium temperatures (500 – 700oP PC) over all three other power cycles considered. Its high efficiency, simplicity, compactness and low capital cost is very attractive. 293 Cycle Efficiency (%)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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