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The friction pressure drop Pf through a pebble bed of height H (Oh and Moore, 2004) can be expressed as P H ave U2 f dh2p where is the pressure drop coefficient, H is the height of the core, dh is the hydraulic diameter, ave is the average density of the fluid in the core, and Up is the mean velocity in the gaps between the particles. The new V-B numerical model with the new pressure drop correlation was benchmarked against a three-shaft baseline case based on HYSIS simulation. The results and comparison are shown in Table 1. Table 1. Comparison between HYSIS simulation and Visual-Basic based model. HYSIS 8650C / 74.50C / 7.9 MPA 111.7 129.5 47% 746MPa V-B Model 8640C/ 77.50C / 8.0 MPA 112.7 129.9 46% 746MPa Figure 1 shows a three-dimensional plot of the plant busbar efficiency as a function of reactor inlet and outlet temperatures for a three-shaft 250 MW thermal helium Brayton cycle using a 92% effectiveness factor for the intermediate heat exchange and 90 % polytropic efficiency for the turbines and compressors. Calculation Method Inlet temperature / pressure to HP turbine Outlet temperature/press ure to HP compressor Total compression work (MW) Total turbine work (MW) Busbar efficiency 3PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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