Directed reflectivity, long life AMTEC condenser (DRC). Final report of Phase II SBIR program[Alkali Metal ThermoElectric Converter] Page: 22 of 33
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Effect of Cell Wall Emissivity to Radial Cell Performance
6C=0.01,Thot=900C, Cell Length 2.5", Wall Thickness 0.015"
--.- FPC Cell Wall Emissivity 0.1 12
14 --A-- - DRC Cell Wall Emissivity0.1
--- FPC Cell Wall Emissivity0.25-0.29
13 ----- DRC Cell Wall Emissivity 0.25-0.29
-4--- FPC Cell Wall Emissivity 0.1
---- - DRC Cell Wall Emissivity 0.1
- -- - FPC cell Wall Emissivity 0.25-0.29
12 --a-- DRC Cell WallEmissivity0.25-0.29 11
2.0 2.5 3.0 3.5 4.0 4.5
Cell Voltage, Volt
Figure 18 Radial Converter Efficiency and Power as Affected by Changes in the Emissivity of the Converter
For the radial converter design, the DRC/DRW surfaces can only offer an improvement if the converter
configuration is specifically designed to minimize basic thermal conduction parasitic losses so that thermal
radiation transfer and the conduction losses that follow from it are dominant and lower emissivity surfaces
can be produced in DRW form. Such designs are likely not to be either structurally sound or cost effective
for a basically radial type concept. The radial converter was the initial design selected for the "Radiation
Tolerant, Eclipse Compatible, Solar AMTEC System" SBIR program for the Air Force under contract
F29601-99-C-0132. This configuration, however, was not ideal for more general applications. A more
general, high efficiency design has evolved as typified by the PX style converter shown schematically in
7. Results for Cylindrical, PX-Style Converter with DRC Surfaces
The PX-style converters, shown schematically and in the photographs of Figures 3, 7 and 9, were
analyzed both for configurations in which the condenser was formed in DRC mode and in which the
converter wall was formed as a Directed Reflectivity Wall surface (DRW). While the Phase I experiments
indicated a minor improvement for the DRC surface on the end condenser, the improvement was useful only
for particular aspect ratios for which the direct radiation from hot zone to condenser was the dominant loss
mechanism. The analysis performed here was for a converter with a length of 5 inches, a diameter of 1 inch
and a hot zone of 2.5 inches length and a hot zone operating temperature of 900 C. The FPC and DRW
converters each had the same 0.015" wall thickness. The results of the analysis for efficiency and power for
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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/m1/22/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.