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CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor Table 1. Input Data for Establishing a Normal Operating Condition item Brayton Cycle thermal balance PHTS and IHTS thermal balance Compressor 1 efficiency Compressor 2 efficiency HTR effectiveness LTR effectiveness Core outlet temperature Core inlet temperature PHTS system pressure drop IHTS system pressure drop PHTS pump efficiency IHTS pump efficiency PHTS heat loss Input parameter Na-CO2 HEX heat transfer rate Na-CO2 HEX exit temperature Turbine efficiency LTR downstream flow-split ratio Na-CO2 HEX heat transfer rate Net electric power output Na-CO2 HEX CO2 inlet temperature Na-CO2 HEX CO2 outlet temperature Na-CO2 HEX CO2 outlet pressure Na-CO2 HEX CO2 heat-transfer tube pressure drop Compression work unit [MWt] [oC] [%] [%] [%] [%] [%] [-] [MWt] [MWe] [oC] [oC] [MPa] [MPa] [%] [%] [%] [oC] [oC] [MPa] [MPa] [MW] Fig. 2. Cycle Efficiency, UA and ∆TLMTD of a LTR and a HTR for the Flow-split Ratio of a LTR Downstream KALIMER-600 1528.9 508.0 93.4 89.1 87.5 91.7 94.6 71 : 29 1528.9 627.78 545.0 390.0 0.45 0.40 85 50 0.3 353.9 508.0 19.74 0.2 332.48 2.2 Estimation of the Flow-Split Rate at the LTR Downstream As mentioned previously, the flow-split ratio of the downstream LTR and the heat-transfer area of the LTR have effects on the cycle efficiency. Using the RECOBA code, the factors such as the cycle efficiency of the Brayton cycle, the overall heat transfer rate (UA) of the HTR and LTR, and the ∆TLMTD were calculated along a variation of the flow-split ratio. As shown in Figure 2, the system efficiency tends to decrease linearly and the heat-transfer area of the HTR slightly decreases when the cooler-side split flow is increasing. However, the heat-transfer area of the LTR considerably increases up to 69% and then it gradually decreases. When we observed a wide range of the split mass fraction, the trace of cycle efficiency tended to increase parabolically with the decrease of the split mass fraction, which has a maximum value in the vicinity of 65%, and then it tended to decrease. Table 2 shows the cycle efficiency and the heat-transfer 1028 NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY CONVERSION
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