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This decision should be revisited when the alternator properties are determined, the operational scenarios are better defined, and the implications of a main power feed interruption have been evaluated. 3 Distribution Voltage Selection The distribution voltage to use for the PMAD system is difficult to select because of several competing effects. High-voltage distribution is advantageous to reduce transmission line conductor mass. But the thickness of the insulation must be increased to keep the design working voltage (DWV) or voltage stress within acceptable limits to meet the mission life.

The conductor mass increases at voltages below this, while the mass of the cable insulation increases at higher voltages. Based on data indicating a cable could be developed that is capable of withstanding the radiation received during a Jupiter mission, and a required derating factor of 2, a DWV of 150 V/mil was employed in subsequent system analyses. An accelerated test is necessary to demonstrate this DWV in a relevant environment over a simulated mission life. 60 37 V/mil 75 V/mil 50 100 V/mil Transmission Line Mass (kg) 150 V/mil 250 V/mil 40 500 V/mil 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 Transmission Voltage (Vrms L-L) Fig.

In the transition region, potassium liquid and vapor coexist on the tube wall. In the last region of the boiler, single-phase potassium vapor is superheated. Calculations with the ATHENA code were completed for a single horizontal tube with different diameters, lengths, lithium inlet temperatures and mass flow rates, and different potassium inlet temperatures, outlet pressures, and mass flow rates. Two different lithium inlet temperatures were examined, 1500 K (for the T-111) system and 1350 K (for the Nb-1%Zr system).

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Advanced Potassium Rankine Power Conversion Sys [space reactor designs]


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