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Publication Title | Description and Test Results from a Supercritical CO2 Brayton Cycle Development Program

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7th International Energy Conversion Engineering Conference AIAA 2009-4607 2 - 5 August 2009, Denver, Colorado

Description and Test Results from a Supercritical CO2 Brayton Cycle Development Program

Steven A. Wright1, Paul S. Pickard2, Milton E. Vernon3 and Ross F. Radel4

Sandia National Laboratories1,2,3,4, Albuquerque, New Mexico, 87185

and

Robert Fuller5

Barber Nichols 6325 W 55th Ave., Arvada, Colorado 80002

The Supercritical CO2 Brayton cycle (S-CO2) can potentially offer more efficient and compact power conversion systems for advanced nuclear reactors, solar, or fossil fuel systems. The DOE Office of Nuclear Energy, Knolls Atomic Power Laboratory, and Sandia National Labs are investigating this cycle in a phased development program because it has the potential for high efficiency (in the temperature range from 400 °C to 750 °C), is very compact making it transportable, and may reduce capital costs due to the very compact turbomachinery. This paper describes resent test results from a supercritical CO2 closed Brayton cycle test loop. Sandia manufactured the loop through its contractor Barber Nichols Inc. The paper describes experimental test measurements of the main compressor performance map, the operational behavior of the supercritical loop at the critical point and below the critical point, and it illustrates the approach to break-even power production at very low turbine inlet temperatures (60 °C / 140 °F) using 78 kW of heater power.

CBC = TAC = rpm = S-CO2 = DOE = Gen IV = LDRD = psi = kW = F,C, K = MAWP = P100 = 400 = 500 = 300 = 301 = p = T =

Nomenclature

Closed Brayton Cycle Turbo-Alternator-Compressor

shaft speed in revolutions per minute Supercritical CO2

Department of Energy

Generation IV

Lab Directed Research and Development pounds per square in

kilo-watt

degreesF,C,ordegreesK

Maximum Allowable Working Pressure Static pressure at the compressor wheel tip Compressor inlet

Compressor exit

Gas chiller inlet

Gas chiller exit

Pressure

Temperature

1 DMTS, Org 6771 MS-1146, PO Box 5800 Albuquerque, New Mexico 87185, no AIAA affiliation.

2 Senior Scientist, Org 6770 MS-1136, PO Box 5800 Albuquerque, New Mexico 87185, no AIAA affiliation. 3 PMTS, Org 6771 MS-1136, PO Box 5800 Albuquerque, New Mexico 87185, no AIAA affiliation.

4 SMTS, Org 6771 MS-1136, PO Box 5800 Albuquerque, New Mexico 87185, no AIAA affiliation.

5 Barber Nichols 6325 W 55th Ave., Arvada, Colorado 80002, no AIAA affiliation.

1

American Institute of Aeronautics and Astronautics 092407

Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.

The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyright owner.

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