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The Sodium Shell and Tube (SoSaT) code was developed to model heat exchangers with sodium on the shell side and either sodium, CO2, or water on the tube side. It uses straight tubes and can produce results for water at pressures up to and beyond critical. Enhanced heat transfer surfaces can be used on the tube side with CO2 and the shell side can incorporate baffles also. Results show that the code sizes heat exchangers to within a few percent of benchmark designs. This tool will be useful for future studies of SFRs and is easily adjusted to different design parameters. MIT’s Printed Circuit Heat Exchanger (PCHE) codes have been expanded to perform the same functions as SoSaT. These codes show that PCHEs are very compact and still do not suffer from severe pressure drops. The codes can still be improved, however, for operability and to incorporate better heat transfer correlations. For core outlet temperatures of 510 oC and below, the Rankine cycle and the S-CO2 cycle produce comparable efficiencies for most configurations. At higher core outlet temperatures, the S-CO2 cycle achieves the higher efficiency. Efficiency can be increased by changing the P-IHX to a PCHE design, switching the PCS to S-CO2, removing the intermediate loop, or increasing the core outlet temperature. Achievable efficiencies are around 42 %. 6.3 Recommended Future Work 6.3.1 S-CO2 Compressors S-CO2 compressors and the cycle’s transient response require more study before they can be ready for full scale development. In general, compressor performance predictions are based on empirical relationships, so experimental work with S-CO2 compressors will be required in order to learn more about their performance. The surge and choke limits are identified by conditions that have been used in air compressors, so the operating range of S-CO2 compressors may differ. Adjusting coefficients in the loss calculations and the criteria for surge and choke can make RGRC match experimental data more closely, once they are available. Continued operation of test compressors will help to develop the state of the art. Because these compressors are relatively compact, when compared to other fluids, research may be more affordable than basic compressor research has been in the past. Also, existing compressor designs can be tested with CO2 in order to develop a database for correlating the performance. In addition, RGRC could be enhanced to include some other calculations. For example, there is no calculation of the stresses on the impeller blades. Narrower blades in dense fluids will need to be engineered to withstand the stresses placed on them during operation. Also, RGRC does not include a model of the Inlet Guide Vanes (IGVs) which are used to control compressor 123PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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