Directed reflectivity, long life AMTEC condenser (DRC). Final report of Phase II SBIR program[Alkali Metal ThermoElectric Converter] Page: 18 of 33
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6. Results for Radial Converter With DRC Surfaces
Analysis of the radial converter design was carried out using a detailed CAD drawing of the converter
housing and the results were derived based on variations of the key configuration parameters. These
parameters are: 1) the converter length in the radial direction from the base of the tube support plate to the
condenser at the circumference of the converter; 2) the hot end temperature; 3) the wall emissivity; 4) the
condenser emissivity; 5) the side wall thickness. The computer calculations produce a large amount of 'data'
which we do not include in this report. The results of the calculations, however, are summarized in the
following five charts.
Effect of Cell Length to Radial Cell Performance
19 =0.05, Ewa=0.1, Thot=900C, Wall Thickness 0.015"
E 1512.5 0
E 15 - FPC Cell with Cell Length 2.5" p- \.
j- - - - ... DRC Cell with Cell Length 2.5" -
/-- - -"- FPC Cell with Cell Length 3.0"
14 ---4-- DRC Cell with Cell Length 3.0"
--V-- FPC Cell with Cell Length 4.0" .x 12.0
--- - DRC Cell with Cell Length 4.0" -. \
13- -'-- FPC Cell with Cell Length 2.5"
--0-- DRC Cell with Cell Length 2.5"
------....-- FPC Cell with Cell Length 3.0" 11.5
---- DRC Cell with Cell Length 3.0"
12 +--- FPC Cell with Cell Length 4.0
. --- --- D R C C e ll w ith C e ll Le ngth 4 .0 "
I __ ____ ___ ____ ___ ____ _ I11.0
2.0 2.5 3.0 3.5 4.0 4.5
Figure 14 Radial Converter Efficiency and Power as Affected by Radial Converter Length.
Figure 14 shows the predicted effect of changes in the radial length of the converter as shown
schematically in Figure 12. It is important to note here that the assumed emissivity of the corner cubes in
the cell wall is e =0.1 so that in a reflection from the wall, generally requiring reflections from all 3 elements
of the corner, the net effective emissivity is e = 0.27. The absorption into a 'flat' (FPC) surface, requiring
only a single reflection can be much smaller. It may be expected that the effectiveness of a DRC surface will
thus be very sensitive to its intrinsic emissivity. The wall thickness of the radial converter ws set at 0.015"
to provide adequate strength for operation at a net inward pressure of- latm. The condenser emissivity of
e = 0.05 is expected to be realistic in the near IR for a surface coated with liquid sodium. For variations on
the length variable alone, the optimum length appears to be close to 2.5". It also appears that the DRC wall
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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/m1/18/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.