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CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor Table 10. Design Value of Heat Exchangers Heat Exchanger Channel Heat Transfer Capacity [MWt] Total Heat Transfer Area [m2] Single Channel Length [mm] Total Number of Channel [ea] Number of Channel on 1 Plate [ea] Na-CO2 HX 1046.6 7,917,247 179 1528.7 42607.4 Cold 1254.5 6,605,593 149 790.6 16,929,875 256 HTR 1746.6 51615.2 Cold 845.2 15,836,829 239 1235.7 17,213,028 263 LTR 1070.3 82023.6 Cold 1357.1 15,673,301 239 Hot 1271.7 7,478,706 218 Cooler Hot Hot Hot 873.7 48900.4 Cold 1163.5 8,174,331 239 PCHE Dimension Assuming 1 UNIT (L W H) [m] Characteristics of Corrugated Channel Bending Angle along Flow Direction [Deg] Number of Turns along Flow Direction [ea] Pitches across Flow Direction [mm] Distance between Plate Edge & Channel [mm] Table 11. Comparison between the Published Experimental Data and Simulation Data 1.05 0.60 176.3 180 0 3.3 0 113 125 4.0 2.8 0.79 0.60 264.3 170 79 2.3 0.4 137 86 2.5 1.8 1.23 0.60 261.7 170 123 2.3 0.4 130 135 2.5 2.1 0.97 0.60 113.5 100 127 2.7 3.2 114 116 2.5 2.7 Experimental data Numerical data Error (%) Cold channel pressure difference (Pa) 73220 65404.6 10.7 Hot channel pressure difference (Pa) 24180 24609.5 1.8 Cold channel Temperature difference (oC) 140.38 141.1 0.51 Hot channel Temperature difference (oC) 169.6 165.46 2.4 Reference conditions for comparison [21] Conditions Cold channel Hot channel Cold channel Hot channel Cold channel Hot channel mass flow mass flow temperature temperature pressure pressure (kg/s) (kg/s) (oC) (oC) (MPa) (MPa) (TIT 614) 0.0003152 0.0001445 107.9 279.9 8.28 2.52 Case 2 (1) between inlet and outlet. In parallel with the PCHE type heat exchanger sizing, an airfoil shape fin heat exchanger has been newly designed. As a first step toward the development of the improved design concept of the PCHE, the CFD analysis was performed to assess the applicability of the CFD method. The FLUENT code was chosen as a CFD tool, and the calculated results were compared with available experimental data. Table 11 shows a comparison between the numerical analysis and previous experimental data for the in-outlet pressure drop and the temperature difference of CO2 in the hot and cold channels. The comparison conditions refer to the previous experimental data [21]. In Table 11 the error is calculated by Equation (2). The results show that the numerical data for the in- outlet pressure drop of CO2 in the hot channel and for the temperature difference of CO2 in the hot and cold channels agree well with published experimental data, with a maximum error of 2.4 %. However, the simulated pressure drop of CO2 in the cold channel is 10.7 % less than the value found in the experimental data. Nonetheless, considering the different conditions between the numerical analysis model and the real experiments, this 10.7 % error seems acceptable. These results validate the three-dimensional numerical analysis model of this study. NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009 1037PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY CONVERSION
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