Directed reflectivity, long life AMTEC condenser (DRC). Final report of Phase II SBIR program[Alkali Metal ThermoElectric Converter] Page: 23 of 33
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Effect of Direct Reflective Wall on Cell Performance
22 - 7
O.A 18 1. 2. 2
8 -- DRW Cell Efficiency
br.. Smooth Wall Cell Efficiency f4tes a t s ri
6 ts f-r ttDRW Cell Pow
e---e--s Smooth Wall Cell Po ser
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Figure 19 Efficiency and Power for a PX-Type Converter - Comparison of DRW and Smooth Converter Walls.
both smooth wall and DRW are shown in Figure 19. The assumptions for these calculations were similar
to those for the radial converter design. The DRW intrinsic surface emissivity was chosen to be E0 0.1 so
the effective emissivity of the wall was then E =0.27. The flat condenser surface was presumed to have
an emissivity Eo =0.05.
Conclusions The analysis clearly indicates that the use of a DRW can improve the efficiency of a single
PX type converter by 1.7% (from -17.9% to 19.6%) for a simple configuration with no optimization of wall
thickness. Optimization of the wall thickness could take advantage of the apparent increased structural
rigidity of a converter wall in which the directed reflectivity corners are impressed to reduce the wall
thickness. This, in turn, would reduce thermal conduction loss, much of which is fed by the radiation. No
allowance furthermore was made for intrinsic reflectivity enhancement if the DRW surface becomes coated
with a layer of liquid sodium. We anticipate that optimization of these other parameters could increase the
incremental effectiveness of the DRW surface in reducing thermal losses. While additional analysis to
investigate the synergistic effects of simultaneous implementation of DRW, thinner walls, shorter (longer)
converter lengths could be valuable, any available funding would, at this stage, be more usefully applied to
building and testing one or more complete DRW converters.
For commercial, terrestrial applications where cost is the most critical discriminator, the added cost 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/m1/23/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.