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20 m 10 m 324.017 K 1378.52 Pa 559.26 K 2098.87Pa Gas Chiller 121.94 kg/s 315.00 K 1185.14 Pa Recuperator 538.87 K 2007.56Pa Reactor/Heater Figure 24. Lumped-Parameter Model of Natural Circulation Flow Through the Heat Rejection Heat Exchanger, Recuperator, and Reactor. 7.2 Three-Dimensional CD3-SC Natural Circulation Analyses The three-dimensional fluid dynamics code C3D-SC was applied to reactor concepts similar to the lumped-parameter model to test its ability to model complex reactor systems. The full three dimensional model will allow investigation of both dimensional and transient effects. More complex models will be developed and tested in the future. For the current study with limited resources, only a simple reactor/heat exchanger operating in independent loops was demonstrated. Figure 25 shows the three dimensional model that was analyzed. The secondary loop connects the heat exchanger by 0.6 m OD piping to the gas chiller which is located 10 m above the intermediate heat exchanger. The cutaway view shows the mesh/grid structure, reactor internals, and simple flat-plate intermediate heat exchanger. In this model, the intermediate heat exchanger is situated 10 m above the bottom of the reactor core, and the final waste heat exchanger is 20 m above the core. There are two independent gas loops with CO2 at different pressures. The main reactor loop is at 20 MPa, and the heat sink loop is at 7 MPa, which is near the critical point of the CO2. Both loops are driven only by natural circulation and do not exchange any fluid. The results to-date show that two independent CO2 flow loops can be energy-coupled in this way and driven entirely natural circulation. It is important to note that the actual loop circulates all the fluid through one loop, which is currently being implemented in the code. 45 2800 kW 7584.5 kPa 35604 kW 2800 kWPDF Image | Supercritical CO2 Direct Cycle Gas Fast Reactor (SC-GFR)
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