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Net shaft thrusts of 49.4 lbs (219.7 N) for the turbo- compressor and 47.4 lbs (210.8 N) for the turbo-generator are calculated during the above described 25 kWe power generation condition. These values are well under the predicted thrust capacity of ~150lbs (667.2 N) at these conditions (~30-35% of capacity). The IST test program continues at the time of finalizing this paper. Presentation of the paper at the conference will include updates on test progress with emphasis on both confirmation of expected results and identification of any unexpected results. CONCLUSIONS Operation of the Integrated System Test has proven that a supercritical CO2 Brayton cycle power system can successfully be controlled through startup, heatup, power generation and shutdown. Control of the compressor, turbomachinery bearing and turbomachinery stator temperatures within component design limits has been demonstrated during initial test operations. Real time monitoring of compressor operating conditions and calculated turbomachinery shaft thrust has also been successfully implemented. Testing to date has not identified any inherent system or component issues associated with the supercritical CO2 Brayton power cycle. Further testing is planned which would lead to achieving full power operation independent of motoring the turbomachinery and demonstrating the potential of the S-CO2 Brayton cycle as a viable power conversion technology. ACKNOWLEDGMENTS This paper summarizes work that has been done by a number of devoted engineers, scientists, and support personnel at the Bettis Atomic Power Laboratory, Knolls Atomic Power Laboratory, and our subcontractors. This paper would not be possible without the efforts of this team. REFERENCES [1] Ashcroft, J. A, Kimball, K. J., and Corcoran, M. R., “Overview of Naval Reactors Program Development of the Supercritical Carbon Dioxide Brayton System”, Proceedings of the Supercritical CO2 Power Cycle Symposium, Troy, NY, April 2009. [2] Kimball, K. J., “Overview of Naval Reactors Program Development of the Supercritical Carbon Dioxide Brayton System”, Proceedings of the Supercritical CO2 Power Cycle Symposium, Boulder, CO, May 2011. [3] Kimball, K. J., “Overview of Supercritical CO2 Brayton Cycle Integrated System Test (IST) Turbomachinery Development”, Proceedings of the Supercritical CO2 Power Cycle Symposium, Boulder, CO, May 2011. [4] Kimball, K. J. and Clementoni, E. M., “Supercritical Carbon Dioxide Brayton Power Cycle Development Overview,” Proceedings of ASME Turbo Expo 2012, Copenhagen, Denmark, June 11-15, 2012. [5] Hexemer, M. J., Hoang, H. T., Rahner, K. D., Siebert, B., and Wahl, G. D., “Integrated Systems Test (IST) S-CO2 Brayton Loop Transient Model Description and Initial Results”, Proceedings of the Supercritical CO2 Power Cycle Symposium, Troy, NY, April 2009. [6] Hexemer, M. J., “Supercritical CO2 Brayton Cycle Integrated System Test (IST) TRACE Model and Control System Design”, Proceedings of the Supercritical CO2 Power Cycle Symposium, Boulder, CO, May 2011. [7] Clementoni, E. M., Cox T.L., and Sprague C.P. “Startup and Operation of a Supercritical Carbon Dioxide Brayton Cycle,” Proceedings of ASME Turbo Expo 2013, San Antonio , Texas, June 3-7, 2013. 9 Copyright © 2013 by ASMEPDF Image | SCO2 BRAYTON CYCLE DEVELOPMENT OVERVIEW
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