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Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..608..980e&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. Conference on Thermophyiscs in Microgravity; Conference on In
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1
Thermoelectric, Electrogasdynamic And Other Direct Energy Conversion, Spaceborne And Space Research Instruments, Apparatus, And Components
Scientific paper
This paper presents a one-dimensional, optimization model of Segmented Thermoelectric Unicouples (STUs). The model predictions are compared with some results of experiments performed at the Jet Propulsion Laboratory to measure the performance parameters of a number of STUs made of n-type Bi2Te3 and CoSb3 based alloys and p-type Bi2Te3 and CeFe4Sb12 based alloys. In addition to determining the input and rejected thermal power of the STUs and the axial temperature distributions in the n- and p-legs, the present model optimizes the lengths and/or the interfacial temperatures of the various segments for either optimum conversion efficiency or optimum electrical power density. Results indicate that well-insulated STUs could have a conversion efficiency of ~12%, when operated at Tc=305-316 K and Th=872-885 K and the total interfacial resistance per leg is ~50 μΩ-cm2. However, due to the high total interfacial resistances of ~690 and 146 μΩ-cm2 and the side heat losses of 1.83 W and 3.7 W, respectively, in the experiments, the peak conversion efficiency is ~5.5% and 4.6% for uni8 and uni12, respectively. Model predictions show that, for a total interfacial resistance of ~50 μΩ-cm2 per leg and zero side heat losses, skutterudite STUs have the potential of achieving a conversion efficiency of 15% when operated at hot and cold side temperatures of 973 K and 300 K, respectively. .
El-Genk Mohamed S.
Saber Hamed H.
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