Supercritical Carbon Dioxide Cycle Analysis

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Supercritical Carbon Dioxide Cycle Analysis ( supercritical-carbon-dioxide-cycle-analysis )

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The codes incorporate fluid property polynomials produced by Yifang Gong which speed up calculations for CO2. These are suitable for the range of applications that recompression cycles require, but can be backed up with NIST fluid property subroutines as well. This compressor code has been used to estimate the performance of Sandia’s test compressor, as a start on benchmarking the code. Results of the benchmarking attempt show that the codes operate without any problems at high relative velocities and that the codes are consistent with expectations. The much smaller Sandia compressor has a similar specific speed to the larger compressor designs and its performance was shown to be similar as well. S-CO2 recompression cycle compressors achieve total-to-static efficiencies greater than 90 % at the design point and they display none of the anomalous features that plagued CCODS in their compressor maps. Multi-stage designs are now possible, up to three stages, and the use of multiple stages becomes necessary for the recompressing compressor of the 500 MWth cycle. 79

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