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Figure 3-9: Photos of the small BNI fabricated gas chiller. The top photos show the CO2 tubes coiled inside the water jacket and end fittings. The bottom figure shows the completed gas chiller installed on the compression loop skid. 3.2.1 Analysis and Modeling of the Gas Pre-cooler The gas pre-cooler was modeled using an updated version of the SNL Reactor Power and Control SIMulation code (RPCSIM) (Figure 3-10) and the TRAC/RELAP Advanced Computational Engine (TRACE) (Figure 3-11). The original version of RPCSIM was described in Wright and Lipinski (Wright, 2006), however it has been modified to use the National Institute of Standards and Technology (NIST) Reference Fluid Thermodynamic and Transport Properties database (Refprop) and to use an enthalpy based solution method. This code was developed to help support SNL in operating and running the loop. It contains a number of simplifying assumptions (mass flow is constant around the loop, and compressible flow only is allowed in the compressor, turbine, and flow valve orifice. This makes the code fast running. The code is written in SIMULINK, (Mathworks, 2008) and uses the NIST Refprop 7 or 8 data base. The code is easy to use and modify. A component model can easily run faster than in real time, however, models that must operate as a loop make take as much as 1⁄2 hour to run a 200 second transient problem. TRACE is a modernized thermal-hydraulics code designed to consolidate the capabilities of Nuclear Regulatory Commission’s (NRC) 3 legacy safety codes - TRAC-P, TRAC-B and RELAP. It is able to 31PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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