Centrifugal Compressor Off-Design Performance for Supercritical CO2

by Robert, L. Fuller & Kevin Eisemann
Barber-Nichols Inc.

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The supercritical carbon dioxide power cycle relies on the low power of compression near the critical point. Depending on the particular heat rejection temperatures available, the compression leg of the thermodynamic cycle can occur in either the subcritical or supercritical regions of the fluid. A small scale compressor was tested at a wide range of operating conditions near the critical point. The test data provides a reasonable foundation for further compressor performance improvements as the supercritical CO2 power cycle is scaled for larger power systems.