Operation and Analysis of a Supercritical CO2 Brayton Cycle

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Operation and Analysis of a Supercritical CO2 Brayton Cycle ( operation-and-analysis-supercritical-co2-brayton-cycle )

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Figure 3-14: ASME stamped heater shell designed to operate at 1000° F (810 K) ~ 2600 psia. 3.4 Motor Alternator and Controller Because the stator will be immersed in supercritical CO2 fluid, the electrical windings and insulation will be exposed to this fluid. There is some concern that over time, the supercritical CO2 will damage the insulation on the stator. Figure 3-15 shows a photo of the stator. At Sandia, we have used an autoclave to perform some screening tests that lasted up to two weeks and in some longer term tests that lasted several months to examine the compatibility of the stator with the S-CO2. In the screening tests, SNL placed a motor/alternator stator in a CO2 autoclave. The stator was kept at 1700 psi for 2 days, and then depressurized in 1⁄2 hour. This cycle was repeated for 2 weeks. Resistance and weight change measurements were made. We observed minor weight reductions (< 1 gm) and reductions in elasticity of the lead wires. For the resistance measurements, no degradation in resistance was observed using a 1000 V at 1000 Mohm meter. . 35

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