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Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..608..998s&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. Conference on Thermophyiscs in Microgravity; Conference on In
Other
Thermoelectric, Electrogasdynamic And Other Direct Energy Conversion, Spaceborne And Space Research Instruments, Apparatus, And Components
Scientific paper
A three-dimensional model of Segmented Thermoelectric Unicouples (STUs) is developed and incorporated into the ANSYS commercial software. The governing equations are solved, subject to the prescribed boundary conditions, using the Finite Element Methodology (FEM) techniques and meshing capabilities in ANSYS. The model accounts for the side heat losses, handles different types of boundary conditions, and accounts for the non-homogeneity and the change in physical and thermoelectric properties of the segments materials in the n- and p-legs with temperature. The model predictions are compared with experimental data of two STUs, uni8 and uni12, comprised of n-type Bi2Te3 and CoSb3-based alloys and p-type Bi2Te3 and CeFe4Sb12-based alloys, and tested recently at the Jet Propulsion Laboratory (JPL) between hot and cold side temperatures of ~305 K and 885 K, respectively. The calculations helped determine not only the side heat losses in these tests and the performance parameters of the STUs, but also the spatial dissipation of the heat losses from the various sides of and of the 3-D temperature fields in the n- and p-legs. The estimated values of the total side heat losses in uni8 and uni12 are 3.7 W and 1.83 W, respectively, and of the total contact resistance per leg are 146 and 690 μΩ-cm2, respectively. The predicted peak conversion efficiencies in these tests for uni8 and uni12 are 4.55% and 5.65%, respectively, compared to 11.46% and 9.09%, which could be attainable with zero side heat losses, for the same total contact resistance per leg. .
El-Genk Mohamed S.
Saber Hamed H.
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