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45 40 35 30 25 20 2.1 2.4 2.8 Total 3.2 Pressure 3.4 Ratio 3.6 4 No Intercooling 0 0.5 1 1.5 2 Second Compressor Pressure Ratio / Equal Split Pressure Ratio Figure 4.29 Optimum pressure ratio split The analysis was performed such that an inter-cooler of the same design as the pre- cooler was added to the optimized design of the simple Brayton supercritical CO2 cycle and the results of the inter-cooled cycle were compared to the non-inter-cooled cycle. Figure 4.29 shows the result of this analysis. The departure from the equal pressure ratio split is immediately apparent. The cycle achieves the best performance when the second compressor provides a 1.5 to 1.9 times larger pressure ratio than the equally-split pressure ratio. The optimum pressure ratio split is a function of the total pressure ratio. The maximum efficiency improvement achieved by inter-cooling is ~ 0.8 %. This explains why the preceding investigators did not report any results for the inter- cooled supercritical CO2 cycle. Inter-cooling is not a viable way of improving the efficiency of this cycle. The small efficiency improvement is not worth the complication of the system. The additional capital cost introduced by the inter-cooling is likely to offset the small benefit that inter-cooling offers. In the case of the sub-critical CO2 Brayton cycle the inter-cooling is beneficial since the fluid behaves as an ideal gas. Therefore, those that focused on this type of cycle successfully used multiple inter- 101 Cycle Efficiency (%)PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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