UNCERTAINTY ON PERFORMANCE MEASUREMENT OF S-CO2 COMPRESSOR OPERATING NEAR THE CRITICAL POINT

Abstract

Recently, S-CO2 Brayton cycle technology is an emerging research area for power conversion system development. Thus, various technologies and approaches are applied to component development and anlaysis or demonstration of the whole system. S-CO2 cycle research team in Korea Advanced Institute of Science and Technology (KAIST) constructed the Supercritical CO2 Pressurization Experiment (SCO2PE) facility. During the experiment, authors observed high uncertainty on compressor performance measurement and it is found that the large uncertainty is due to large property variation of CO2 near the critical point and when a compressor with low pressure ratio is being used. Since compressor operating conditions are near the critical point of CO2 in the S-CO2 Brayton cycle, performance measurement for low pressure ratio compressor requires different approach to yield low uncertainty in the measurement. In this paper, uncertainty on performance measurement of low pressure ratio S-CO2 compressor and approach what authors are trying to utilize will be discussed.