Operation and Analysis of a Supercritical CO2 Brayton Cycle

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Operation and Analysis of a Supercritical CO2 Brayton Cycle ( operation-and-analysis-supercritical-co2-brayton-cycle )

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analyze large/small break Loss of Coolant Accidents (LOCA) and system transients in both Pressurized Water Reactors (PWR) and Boiling Water Reactors (BWR). The capability also exists to model thermal hydraulic phenomena in both 1-D and 3-D space. This code is much more sophisticated than RPCSIM, but it is relatively difficult to use and requires much longer run times. Figure 3-10: RPCSIM model of the gas chiller. The orange module calculates pressure drop and the heat transfer coefficient in the water leg. The pink module on the left calculates water temperature increase. The pink module on the right calculates heat transfer, pressure drop, and temperature change for the S-CO2 leg. The TRACE and RPCSIM codes were both used to model the gas chiller of the Sandia S-CO2 compression loop. Both codes modeled the gas chiller as a counter flow heat exchangers and divided the S-CO2 and water flow channels into 80 cells. The temperatures of these cells are plotted in Figure 3-12. A comparison of the initial results of the two codes are in very good agreement (<1 K difference). A closer examination of the input data for these two models reveals two small differences that are the likely cause for the observed temperature differences. First, the TRACE model has not yet been updated to reflect the as-built specifications of the gas chiller. This has led to small geometric differences in the models which will be corrected soon. The second more likely source of error is the thermal hydraulic properties that were used for the water mix. RPCSIM uses actual data for a 25% mixture of propylene glycol with water, while TRACE uses properties for pure water. 32

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