Directed reflectivity, long life AMTEC condenser (DRC). Final report of Phase II SBIR program[Alkali Metal ThermoElectric Converter] Page: 28 of 33
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taken again once thermal equilibrium is re-established. The time between these data sets is between 20 and
30 minutes. Finally, once adiabatic conditions are reached, four measurements are made. The voltage and
current coming from the AMTEC converter gives the converter power output. Likewise, the voltage across
the hot end heater and the current going through it give the thermal power input by the hot end heater.
Control Converter Testing
The experimental program was begun with a conventional PX-6 converter having the usual complement
of radiation heat shields attached to the side wall at the cold end of the converter shell. Figure 25 shows a
plot of data taken on the DRC control converter using a fast sweep of the current from open circuit to short
circuit current and return to open circuit. The two-valued curves occur because under load the temperature
Figure 25 Power and I-V Data for DRC-2 Converter at 800 C Hot End and 350 C Cold End. The
Lower Curves in Both Parameters are the Response to the Drop Below Starting Temperature Under
of the BASE tube and cathode drops rapidly and in the time of a short sweep does not have time to recover.
Tests at equilibrium reflect the lower temperatures appropriate for each current setting given that the input
surface temperature is kept constant. The tests run in this way are shown in the plots in Figure 26 and Figure
27. The effect of the lowered BASE and evaporator temperatures under full load is apparent in a comparison
of these two sets of plots. The power and current-voltage relations determining the output in the efficiency
experiments correspond directly to the equilibrium values shown here in the "step test' plot in Figure 26.
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Hunt, Thomas K. Directed reflectivity, long life AMTEC condenser (DRC). Final report of Phase II SBIR program[Alkali Metal ThermoElectric Converter], report, September 10, 2001; United States. (https://digital.library.unt.edu/ark:/67531/metadc717643/m1/28/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.