Verification of Gas System Analysis Code GAMMA+ with S-CO₂ Compressor Test Data

In this study, the validation and verification of the GAMMA+ code, which is gas system transient analysis code was conducted by using the obtained SCO₂PE experimental results. Before performing a SCO₂PE loop transient simulation with the updated GAMMA+ code, major components, the compressor and the heat exchanger, were separately modeled. For the transient experiment, the reduction in cooling event was experimented in the SCO₂PE. The results of GAMMA+ code show reasonable agreement with SCO₂PE experimental data. However, there is a minute difference between the GAMMA+ prediction and the experimental data, especially at the compressor outlet condition because the heat transfer value from the experimental data was uncertain due to the measurement uncertainties and the CO₂ properties near the critical point. To reduce the difference between the experimental data and GAMMA+ results, the modeling of SCO₂PE and the methodology for turbomachinery analyses will have to be updated in the future