English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A reference design for a 2 kw(e) thermoelectric power unit has been evolved to serve as the basis for technology evaluation tests in Task II of the Isotope Kilowatt Program. This reference design makes use of potassiim heat pipes to transport heat to thermoelectric modules from the same basic heat blockshield assembly as woiild be used for the organic and steam Rankine cycle systems of this program. The heat block-shield employs seven capsules of ^°Sr in the form of SrTi03 encased in Hastelloy. Designs for both iron and nickel heat block-shield units have been prepared. Twelve thermoelectric modules/ each with a 1-in, diameter, 79-in. long heat pipe, are designed to produce l67 w each at Z4 V. They can be coupled in a series-parallel arrangement to yield 2 kw(e) at 4-8 v. The design is based on lead telluride thermoelectric junctions, but is equally well suited to use with advanced materials yielding a higher efficiency when these become available. The design studies have been extended to include an investigation of the improvement in performance that might be obtained with the new TPM-217 thermoelectric material under development at the 3M Company. Studies at 3M under an ORNL subcontract show promise of increasing the overall thermal efficiency from the 8.5^ estimated for the present lead telluride material to 11.1^ for the TPM-217 material. This improvement would entail increasing the hot junction temperature from 1050 to 1350°F, and would require the use of nickel In place of i i'or for the heat block-shield assembly.

REFERENCE DESIGN FOR A THERMOELECTRIC ISOTOPE POWER UNIT EMPLOYING HEAT PIPE MODULES.